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Sulfur‐doped Eosin‐B (SDE‐B) photocatalysts were synthesized for the first time utilizing sublimed sulfur (S8) as a dopant in an in situ thermal copolymerization technique. Sulfur doping not only increased Eosin‐B (E‐B) absorption range for solar radiation but also improved fixation and oxygenation capabilities. The doped sulfur bridges the S‐S bond by substituting for the edge bromine of the E‐B bond. The improved photocatalytic activity of SDE‐B in the fixation and oxygenation of NAD+/NADP+ and sulfides using solar light is attributed to the photo‐induced hole of SDE‐B's high fixation and oxygenation capacity, as well as an efficient suppression of electron and hole recombination. The powerful light‐harvesting bridge system created using SDE‐B as a photocatalyst works extremely well, resulting in high NADH/NADPH regeneration (79.58/76.36%) and good sulfoxide yields (98.9%) under solar light. This study focuses on the creation and implementation of a sulfur‐doped photocatalyst for direct fine chemical regeneration and organic transformation. [ABSTRACT FROM AUTHOR]

Nicotinamide Adenine Dinucleotide Phosphate (NAD(P)H) plays an important role in numerous biologically significant redox reactions. The photochemical restoration of its oxidized form (NAD(P)+) under physiological conditions is intriguing in the context of integrated photo and catalysis. Herein, we report the functionalized graphitic carbon‐based solar light active photocatalyst by doping boron and fluorine in the native graphitic carbon nitride (GCN) (nonfunctionalized) for the regeneration of enzymatically visible light active coenzyme and in photo‐acetalization reactions. The metal‐free functionalized photocatalyst systems such as BFGCN‐x leads to higher yield NADH and NADPH regeneration. They are also capable of catalyzing acetal reactions in the absence of any Lewis and Bronsted acids. The current research endeavor provides the advancement and the application of functionalized GCN‐based photocatalysts for NADH (61.89%), NADPH (59.84%) regeneration, and photo‐acetalization reactions. [ABSTRACT FROM AUTHOR]

Carbon dioxide reduction together with aerobic oxidative cyclization using eosin Y-based light-harvesting photocatalysts remains a key challenge. In this study, we present the first-ever synthesis of unique in situ Se-infused eosin Y (Sein–EY) flexible photocatalysts through a simple one-pot method. The as-synthesized Sein–EY flexible film photocatalyst exhibits outstanding performance for the production of formic acid (204 μM in 2 h) and aerobic oxidative cyclization of thioamides via the formation of C–N/C–S bonds with outstanding yields (98.6%) when exposed to solar light. The presence of infused Se significantly extends the solar light absorption capacity of the Sein–EY photocatalyst, reaching up to 580 nm. This study opens up a new pathway for the rational design and synthesis of potentially effective Se-infused-EY photocatalysts through a simple and scalable method, enabling both solar chemical production and efficient one-pot three-component reactions. [ABSTRACT FROM AUTHOR]

Elevated global pollution level is the prime reason that contributes to the onset of various harmful health diseases. The products of Biginelli reaction are enormously used in the pharmaceutical industry as they have antiviral, antibacterial, and calcium channel modulation abilities. This work reports a novel eosin Y sensitized boron graphitic carbon nitride (EY‐Ben‐g‐C3N4) as a photocatalyst that efficiently produced 3,4‐dihydropyrimidine‐2‐(1H)‐one by the Biginelli reaction of benzaldehyde, urea, and methyl acetoacetate. The photocatalyst EY‐Ben‐g‐C3N4 showed a successful generation of 3,4‐dihydropyrimidine‐2‐(1H)‐one (Biginelli product) in good yield via photocatalysis which is an eco‐friendly method and has facile operational process. In addition to the production of Biginelli products, the photocatalyst also showed a remarkable NADH regeneration of 81.18%. The incorporation of g‐C3N4 with boron helps increase the surface area and the incorporation of eosin Y which is an inexpensive and non‐toxic dye, and in Ben‐g‐C3N4, enhanced the light‐harvesting capacity of the photocatalyst. The production of 3,4‐dihydropyrimidine‐2‐(1H)‐one and NADH by the EY‐Ben‐g‐C3N4 photocatalyst is attributed to the requisite band gap, high molar absorbance, low rate of charge recombination, and increased capacity of the photocatalyst to harvest solar light energy. [ABSTRACT FROM AUTHOR]

The visible light-assisted photocatalysis approach allows more sustainable and atom-economical C–H bond arylation processes. The polymer-based photocatalysts are an attractive choice because of their variable design and development feasibility as well as effective catalytic applications. In the present work, by following the basic principles of green chemistry, we have chosen an environmentally friendly and biologically suitable chemical i.e. Erythrosine B as a unit molecule for the generation of photocatalyst EP (C20H8O5S4). The generation of EP has been performed via a one-pot solvothermal reaction of Erythrosine B with sulfur powder. The structural analysis of the EP evidence the generation of an interesting example 2D-polymeric assembly where disulfide (–S–S–) units are acting as linkers and show high thermal stability up to 800 °C (39.9% left as a residue). The low optical band gap of 2.08 eV and electrochemical band gap of 2.09 eV favors its catalytic applicability. The catalytic investigation reveals excellent applicability of EP in C–H arylation (yield 98.5% & selectivity 99%). [ABSTRACT FROM AUTHOR]

The combination of excellent electronic properties and thermal stability positions orange‐derived graphene quantum dots (GQDs) as promising materials for solar light‐based applications. Researchers are actively exploring their potential in fields such as photovoltaics, photocatalysis, optoelectronics, and energy storage. Their abundance, cost‐effectiveness, and eco‐friendly nature further contribute to their growing relevance in cutting‐edge scientific research. Furthermore, only GQDs are not much more effective in the UV‐visible region, therefore, required band gap engineering in GQDs material. In this context, we designed GQDs‐based light harvesting materials, which is active in UV‐visible region. Herein we synthesized GQDs coupled with 2,6‐diaminoanthrquninone (AQ), that is, GQDs@AQ light harvesting photocatalyst the first time for the oxidation of sulfide to sulfoxide under visible light. For the integrating reactions of sulfide in aerobic conditions under visible light by GQDs@AQ photocatalyst exhibit utmost higher photocatalytic activity than simple GQDs due to low molar extinction coefficient and slow recombination charges. The use of GQDs@AQ light harvesting photocatalyst, showed the excellent organic transformation efficiency of sulfide to sulfoxide with excellent yield (94%). The high efficiency and excellent yield of 94% indicate the effectiveness of GQDs@AQ as a photocatalyst for these specific organic transformations. [ABSTRACT FROM AUTHOR]

Photocatalysis is one of the most promising methods for producing organic compounds with a renewable source of energy. Two‐dimensional covalent organic frameworks (2D COFs) are a type of polymer that has developed as a potential light‐harvesting catalyst for artificial photosynthesis with a design‐controllable platform that might be developed into a new type of cost‐effective and metal‐free photocatalyst. Here, we present a two‐dimensional covalent organic framework synthesis technique as a low‐cost and highly efficient visible light active flexible photocatalyst for C–H bond activation and dopamine regeneration. 2D COF were synthesized from tetramino‐benzoquinone (TABQ) and terapthaloyl chloride monomer through condensation polymerization reaction and the resultant photocatalyst have remarkable performance due to its visible light‐harvesting capacity, appropriate band gap, and highly organized π‐electron channels. The synthesized photocatalyst is capable to convert dopamine into leucodopaminechrome with a higher yield (77.08%) and also capable to activate the C–H bond between 4‐nitrobenzenediazonium tetrafluoroborate and pyrrole. [ABSTRACT FROM AUTHOR]

Graphene is one of the amazing present encroachments in current research area of science and one of the utmost fascinating materials for relevance in cutting-edge research. Herein, we designed lemon-derived heteroatoms-doped graphene quantum dots (S, N-GQDs) based photocatalyst for the first time. For the integrating reactions of amines in aerobic conditions under solar light by S, N-GQDs photocatalyst exhibit utmost higher photocatalytic activity than simple oxygen-doped graphene quantum dots (O-GQDs) due to slow recombination charges. The mechanisms accountable for the drastically increased photocatalytic activity of S, N-GQDs in solar light responsive integrating reactions of amines in aerobic conditions into the corresponding derivative of imines are also completely scrutinized. [ABSTRACT FROM AUTHOR]

Metal-free photocatalysis is a sustainable and environmentally friendly method of transforming solar energy into molecules with added value. A light-harvesting photocatalyst without metal Phloxin-B (P-B) in-situ edge functionalized graphitic carbon nitride (g-C3N4) was assembled to enable the solar-light responsive photocatalytic C-H bond arylation and NADH regeneration cofactor. The photocatalytic performance was examined to estimate the C-H bond arylation and NADH regeneration efficiency by g-C3N4/P-B composite photocatalyst. The charge carrier transfer of g-C3N4 was found to be stimulated by the light harvester P-B layer, increasing the efficiency of chemical synthesis under solar light irradiation. In light of this, the g-C3N4/P-B composite photocatalyst exhibits high photocatalytic activity for the successful C-H bond arylation (98.6%) and regeneration of NADH (70.7%). This composite photocatalyst was characterized by FTIR and UV-visible spectrum along with particle size analysis, and cyclic voltammetry (CV). This effort offers a new and superficial technique to synthesize a highly efficient g-C3N4/P-B composite photocatalyst and afford a greener path for renewable energy and photocatalytic reactions. The graphical abstract represents the highly selective g-C3N4/P-B photocatalyst for the C-H bond activation of 4-bromoaryldiazonium salts with furan and regeneration of NADH under solar light irradiation. The g-C3N4/P-B photocatalyst has been effective photocatalytic property due stacking of Phloxin-B dye (P-B) on the g-C3N4 sheet. NADH regenerated and C-H bond arylated products are used as substrates in the pharma industries. [ABSTRACT FROM AUTHOR]

An inexpensive graphitic carbon nitrite (g-C3N4) photocatalyst was hybridized with selenium oxide (SeO2) photocatalyst by a monolayer-dispersed technique. After hybridization of g-C3N4 with SeO2, the NADH/NADPH regeneration efficiency of SeO2 photocatalyst was enhanced under solar light illumination. The photocatalytic activity of SeO2/g-C3N4 photocatalyst under solar light illumination was enhanced by 3-fold higher than g-C3N4 photocatalyst, the solar light photocatalytic activity was produced and the photo-decomposition of SeO2 photocatalyst was completely stifled after hybridized SeO2 photocatalyst by g-C3N4 photocatalyst. The improvement in performance and photo-decomposition inhibition under solar light illumination was persuaded by efficiency separation of photo-persuaded holes from SeO2 to the valence bond (V.B.)/highest occupied molecular orbital (HOMO) of g-C3N4 under solar light illumination, the electron jumped from the V.B. to the conduction band (C.B.)/lowest unoccupied molecular orbital (LUMO) of g-C3N4 could directly insert into the C.B. of SeO2 photocatalyst, synthesized SeO2/g-C3N4 photocatalyst is highly active for NADH/NADPH regeneration under solar light. [ABSTRACT FROM AUTHOR]

To minimize the ever‐increasing global warming and environmental problems, the conversion of atmospheric CO2 into value‐added solar chemicals/fuels is one of the most challenging tasks. As a means to accomplish this, herein we have synthesized first time novel in situ selenium‐doped polyimide frameworks (Se‐PIFs) photocatalyst via thermal co‐polymerization approach between melem (M) and perylene 3, 4, 9, 10‐tetracarboxylic dianhydride (PTDA) along with selenium (Se) as a dopant. The Se‐PIFs photocatalyst shows outstanding photocatalytic stability and activity for high solar fuel production (HCOOH ~ formic acid) from CO2. The solar light active Se‐PIFs photocatalyst was demonstrating the ~ 10‐fold higher photo‐conversion of CO2 to formic acid with yields of 250. 6 μmol. The current work is providing a facile and scalable avenue as well as sheds light on creating a new route for in situ judicious design highly efficient Se‐PIFs photocatalyst. The outcome is a benchmark instance for the use of selenium‐doped polyimide frameworks as a highly practical and efficient solar light active photocatalyst for carrying out the selective production of formic acid from environmental CO2. [ABSTRACT FROM AUTHOR]

To minimize the ever‐increasing global warming and environmental problems, the conversion of atmospheric CO2 into value‐added solar chemicals/fuels is one of the most challenging tasks. As a means to accomplish this, herein we have synthesized first time novel in situ selenium‐doped polyimide frameworks (Se‐PIFs) photocatalyst via thermal co‐polymerization approach between melem (M) and perylene 3, 4, 9, 10‐tetracarboxylic dianhydride (PTDA) along with selenium (Se) as a dopant. The Se‐PIFs photocatalyst shows outstanding photocatalytic stability and activity for high solar fuel production (HCOOH ~ formic acid) from CO2. The solar light active Se‐PIFs photocatalyst was demonstrating the ~ 10‐fold higher photo‐conversion of CO2 to formic acid with yields of 250. 6 μmol. The current work is providing a facile and scalable avenue as well as sheds light on creating a new route for in situ judicious design highly efficient Se‐PIFs photocatalyst. The outcome is a benchmark instance for the use of selenium‐doped polyimide frameworks as a highly practical and efficient solar light active photocatalyst for carrying out the selective production of formic acid from environmental CO2. [ABSTRACT FROM AUTHOR]

Photocatalysis has emerged as a promising approach for generating solar chemical and organic transformations under the solar light spectrum, employing polymer photocatalysts. In this study, our aim is to achieve the regeneration of NADH and fixation of nitroarene compounds, which hold significant importance in various fields such as pharmaceuticals, biology, and chemistry. The development of an in-situ nature-inspired artificial photosynthetic pathway represents a challenging task, as it involves harnessing solar energy for efficient solar chemical production and organic transformation. In this work, we have successfully synthesized a novel artificial photosynthetic polymer, named TFc photocatalyst, through the Friedel-Crafts alkylation reaction between triptycene (T) and a ferrocene motif (Fc). The TF C photocatalyst is a promising material with excellent optical properties, an appropriate band gap, and the ability to facilitate the regeneration of NADH and the fixation of nitroarene compounds through photocatalysis. These characteristics are necessary for several applications, including organic synthesis and environmental remediation. Our research provides a significant step forward in establishing a reliable pathway for the regeneration and fixation of solar chemicals and organic compounds under the solar light spectrum. Bio-inspired In-Situ Synthesis of Polymer Photocatalyst for Selective Enzymatic 1,4-NADH Regeneration and Nitroarene Fixation. [Display omitted] • Polymer Photocatalyst for Selective Enzymatic Regeneration and Nitroarene Fixation. • Photocatalyst exhibits exceptional optical properties. • Photocatalyst exhibits exceptional photocatalytic performance and selectivity. [ABSTRACT FROM AUTHOR]

Summary: Development of ecofriendly and low‐cost highly efficient photocatalysis is of importance in the field of chemical synthesis. Currently, various metals‐based organic materials, metal oxide nanoparticles, and metal nanomaterials have been urbanized as light harvesting photocatalysts for direct carbon (C)‐hydrogen (H) arylation of aryl diazonium salts and heteroarenes. These light harvesting photocatalysts, however, still suffer from poor stability, reusability problem, high cost, or less selectivity. Herein, we report the fabrication of a novel chitosan‐based fluorescein isothiocyanate (CBFITC) film photocatalyst and demonstrate its tremendous photocatalytic activity, high yields (97 ± 0.015%), selectivity (99%), and reusability to catalyze the metal free solar‐light‐mediated direct CH arylation of aryl diazonium salts and heteroarenes at ambient temperature. Moreover, CBFITC film photocatalyst can be recycled more than five times without loss of activity, verifying this photocatalyst excellent light harvesting ability and stability. The present approach to fabricate a metal‐free film photocatalyst with the suitable band gap will be a new platform for efficient photocatalytic reaction and provide a new insight into the solar chemical synthesis. [ABSTRACT FROM AUTHOR]

Main observation and conclusion: Photoredox C—H bond formation can proceed in aerobic environment under solar light and has therefore become attractive. Nowadays, different types of expensive novel metal complexes and nanomaterials have been urbanized as photocatalysts for direct C—H bond formation in between derivatives of heteroarenes (HAs) and aryl diazonium salts. These photocatalysts, however, still suffer from poor stability, high cost, and decay. Herein, a graphitic carbon nitride‐based fluorescein isothiocyanate (g‐C3N4–FITC) film photocatalyst has been reported, which shows excellent light harvesting ability, and band gap suitability to catalyze the metal free direct C—H arylation of HAs under solar light at ambient temperature. Moreover, the g‐C3N4–FITC film photocatalyst can be reused four times without significant loss of activity, confirming the excellent photocatalytic stability. The current strategy to construct a g‐C3N4–FITC film photocatalyst for direct C—H arylation opens a new path towards replacing metal‐based catalysts in fine chemical synthesis. [ABSTRACT FROM AUTHOR]

• This manuscript focuses on how structural ordering can facilitate the formation of formic at ultra-low potential, which is a critical challenge via photocatalysis. • Human dependency on fossil fuels not only spikes the CO2 levels in the atmosphere but also depletes the limited energy resources. • The photocatalyst-enzyme integrated artificial system emerged as a benchmark for CO2 fixation solving both the energy crisis and carbon emission simultaneously. • Herein a TBE-Y photocatalyst designed by coupling triptycene (T) with eosin-Y (EY) through friedel craft reaction shows excellent solar light harvesting property, high molar extinction coefficient, and appropriate band-gap. • The as-synthesized 3D polymeric TBE-Y photocatalyst exhibits high NADH regeneration (78.77%) which when consecutively coupled with enzyme (formate dehydrogenase) via electron mediator produces HCOOH from CO2 in high yield. Carbon dioxide, one of the primary greenhouse gasses leading to global warming, ocean acidification, and climate change is an obnoxious concern. Human dependency on fossil fuels not only spikes the CO 2 level but also depletes the limited energy resources. The horrendous impact of carbon footprint has made the reduction of CO 2 into solar fuel an indispensable task. The photocatalyst-enzyme integrated artificial system has emerged as a benchmark for CO 2 fixation solving both the energy crisis and carbon emission simultaneously. Herein a TBE-Y photocatalyst designed by coupling triptycene (T) with eosin-Y (EY) through Friedel Craft reaction shows excellent solar light harvesting property, high molar extinction coefficient, and appropriate band-gap. The as-synthesized 3D polymeric TBE-Y photocatalyst exhibits high NADH regeneration (78.77%) which when consecutively coupled with enzyme (formate dehydrogenase) via electron mediator produces HCOOH (189.34 μmol) from CO 2 in high yield in 2 h. The graphical abstract shows the formation and regeneration of HCOOH from CO 2 and NADH respectively through TBE-Y photocatalyst under solar light irradiation. The TBE-Y photocatalyst was formed through Friedel craft reaction by the coupling of Triptycene and Eosin-Y, which is utilized for HCOOH formation from CO 2 in the presence of Solar light. Formic acid and NADH regeneration have a wide application in pharmaceutical companies. [Display omitted] [ABSTRACT FROM AUTHOR]

Abstract: The conversion of CO2 to valuable solar fuels by means of solar energy using metal‐free flexible film photocatalysts is an appealing strategy. Here we demonstrate a three dimensional aromatic polymer (3DAP) derived from triptycene (TC) as a metal free, stable and highly efficient visible light responsive flexible film photocatalyst for selective solar fuel production from CO2. For this research work, the polymerization of TC by the Diels–Alder reaction is exploited for the first time as a new synthetic approach for the construction of three dimensional aromatic polymer photocatalyst. The visible‐light harvesting ability, band gap suitability, high Brunauer–Emmett–Teller (BET) surface area and electron transfer capability via interconnecting 3D chain of 3DAP contribute to the excellent performance of the film photocatalyst as evident from 91.09 % NADH regeneration and 225.12 μmol of formic acid production. This work provides important insights into the design of flexible polymer film photocatalyst for selective solar fuel formation from CO2 and is expected to trigger further interest in sustainable solar energy conversion applications such as tailorable and wearable devices. [ABSTRACT FROM AUTHOR]

Abstract: The conversion of CO2 to valuable solar fuels by means of solar energy using metal‐free flexible film photocatalysts is an appealing strategy. Here we demonstrate a three dimensional aromatic polymer (3DAP) derived from triptycene (TC) as a metal free, stable and highly efficient visible light responsive flexible film photocatalyst for selective solar fuel production from CO2. For this research work, the polymerization of TC by the Diels–Alder reaction is exploited for the first time as a new synthetic approach for the construction of three dimensional aromatic polymer photocatalyst. The visible‐light harvesting ability, band gap suitability, high Brunauer–Emmett–Teller (BET) surface area and electron transfer capability via interconnecting 3D chain of 3DAP contribute to the excellent performance of the film photocatalyst as evident from 91.09 % NADH regeneration and 225.12 μmol of formic acid production. This work provides important insights into the design of flexible polymer film photocatalyst for selective solar fuel formation from CO2 and is expected to trigger further interest in sustainable solar energy conversion applications such as tailorable and wearable devices. [ABSTRACT FROM AUTHOR]

Photocatalytic CO2 reduction for solar fuel production has attracted considerable attention as it can simultaneously reduce the effects of worldwide fossil-fuel shortage and global warming. As a means to achieve this we herein report the facile and eco-friendly synthesis of highly active carbon nanodots-silica hybrid photocatalyst (CNDSH) by a reverse microemulsion method with a nonionic surfactant. The photocatalyst-biocatalyst coupled system developed using CNDSH as photocatalyst functions efficiently to carry out high NADH regeneration (74.10±0.17 %) followed by its consumption in exclusive formic acid production (203.33±1.9 μmol) from CO2. This research work is a benchmark example of carbon nanodots-silica hybrid photocatalyst system for solar fuel production and expected to trigger further interest in the development of efficient and eco-friendly CO2 reduction systems. [ABSTRACT FROM AUTHOR]

Photocatalytic CO2 reduction for solar fuel production has attracted considerable attention as it can simultaneously reduce the effects of worldwide fossil-fuel shortage and global warming. As a means to achieve this we herein report the facile and eco-friendly synthesis of highly active carbon nanodots-silica hybrid photocatalyst (CNDSH) by a reverse microemulsion method with a nonionic surfactant. The photocatalyst-biocatalyst coupled system developed using CNDSH as photocatalyst functions efficiently to carry out high NADH regeneration (74.10±0.17 %) followed by its consumption in exclusive formic acid production (203.33±1.9 μmol) from CO2. This research work is a benchmark example of carbon nanodots-silica hybrid photocatalyst system for solar fuel production and expected to trigger further interest in the development of efficient and eco-friendly CO2 reduction systems. [ABSTRACT FROM AUTHOR]

Functionalized graphene quantum dots (fGQDs) as visible-light-harvesting photocatalysts for solar fuel production from CO2 is explored for the first time. The highly efficient light-harvesting fGQDs photocatalyst upon integration with the biocatalyst performs highly selective CO2 reduction to formic acid. The results are a benchmark example of GQD based materials as photocatalysts for selective production of solar fuels from CO2 and opens up possibilities for greener synthesis of other value added chemicals. [ABSTRACT FROM AUTHOR]

Functionalized graphene quantum dots (fGQDs) as visible-light-harvesting photocatalysts for solar fuel production from CO2 is explored for the first time. The highly efficient light-harvesting fGQDs photocatalyst upon integration with the biocatalyst performs highly selective CO2 reduction to formic acid. The results are a benchmark example of GQD based materials as photocatalysts for selective production of solar fuels from CO2 and opens up possibilities for greener synthesis of other value added chemicals. [ABSTRACT FROM AUTHOR]

The successful development of a photocatalyst/biocatalyst integrated system that carries out selective methanol production from CO2 is reported herein. The fine-tuned system was derived from a judicious combination of graphene-based visible light active photocatalyst (CCG-IP) and sequentially coupled enzymes. The covalent attachment of isatin-porphyrin (IP) chromophore to chemically converted graphene (CCG) afforded newly developed CCG-IP photocatalyst for this research endeavor. The current work represents a new benchmark for carrying out highly selective methanol formation from CO2 in an environmentally benign manner. [ABSTRACT FROM AUTHOR]

C60‐based polymeric systems have been constantly anticipated for sustainable solar energy conversion. Reported, herein is a C60 polymer film as visible light active photocatalyst for efficient and selective reduction of CO2 for the first time. The C60 polymer photocatalyst is synthesized via covalent coupling of C60 monomer units consisting of tetra substituted C60‐pyrene conjugates through spacer groups. The synthesized C60 polymer photocatalyst possesses an extended network of well‐defined repeating monomer units with good stability and visible light‐induced photocatalytic activity. The enhanced visible light harvesting ability of C60 polymer photocatalyst reasonably yields it with higher catalytic ability than its monomer unit. The C60 polymer film photocatalyst upon coupling with the biocatalyst carries out highly selective visible light driven reduction of CO2 to HCOOH (239.46 μmol). The tandem way of incorporating C60 into visible light active polymeric films for continuous use may be highly rewarding for their extended photocatalytic activity for solar fuel production from CO2. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2020, 137, 48536. [ABSTRACT FROM AUTHOR]

The Cover shows the exclusive production of formic acid from CO2 using a carbon nanodots‐silica hybrid photocatalyst system.In their Full Paper, R. K. Yadav et al. report a new carbon nanodots‐silica hybrid material (CNDSH) as a highly active photocatalyst for the photocatalytic‐biocatalytic coupled selective solar fuel production system from CO2. The CNDSH photocatalyst was obtained by a facile and ecofriendly reverse microemulsion method with a nonionic surfactant. This work would serve as a benchmark example of a carbon nanodots‐silica hybrid photocatalyst system for solar fuel production and is expected to trigger further interest in the development of efficient and ecofriendly solar CO2 reduction systems. [ABSTRACT FROM AUTHOR]

• Two-dimensional flexible covalent porphyrin framework (2D CPF) was synthesized. • The 2D CPF photocatalyst deposited on the thin film facilitates the C H bond activation. • The 2D CPF shows the high yield and selectivity of product in the C H bond activation. Photocatalysis is one of the most promising ways for the production of organic chemicals with renewable energy source. For the development of cost-effective and metal-free catalysts, two-dimensional covalent organic framework (COF) has been emerged as a photocatalyst. Here, we report the synthetic method of two-dimensional covalent porphyrin framework (2D CPF) and the fabrication procedure of highly active flexible film. 2D CPF were constructed from tetrakis-(4-amino-phenyl)-porphyrin (TAPP) and tetrakis-(4-nitro-phenyl)-porphyrin (TNPP) monomers through the poly-condensation reaction and the resultant composite showed the superb harvesting ability of solar light, the suitable optical band-gap, and the highly ordered π-electron channels which facilitates efficient charge migrations. The 2D CPF photocatalyst deposited on the thin film was readily applicable to light-induced activation of C H bond between p -position of substituted aryl diazonium salts and heteroarenes, and exhibited the high selectivity (~99%) as well as high production yield. Our results show an experimental benchmark for the use of flexible COF film as a highly practical and efficient solar light responsive photocatalyst for the selective C H bond formation in between substituted aryl diazonium salts and heteroarenes derivatives. [ABSTRACT FROM AUTHOR]

[Display omitted] • Use of non-toxic/least toxic chemicals. • Generation of least studied ester-linked covalent organic polymer. • Crystalline nanosheet generation (average crystallite size = 43.5 nm, crystallinity = 90.5 %). • Excellent photocatalytic activity with high selectivity for C-H activation and C-C bond formation reaction. Among all polymeric materials, the chemistry of covalent organic polymers has been the least covered in the field of photocatalysis due to the rare availability of design and synthetic protocols. In the present work, we have come up with an efficient design of a one-dimensional Covalent Organic polymer (COP) (S-COP) through the ester-linked co-polymerization of Erythrosine B with 2,2′-Dithiodibenzoic acid (2,2′-DDB). The COP was synthesized via the facile one-pot solvothermal method. The XRD data analysis favors high crystalline nanoscale polymeric sheet generation (S-COP , 90.5 % & 43.5 nm). The HOMO-LUMO calculation through an electrochemical study as well as Tauc's plot showed 2.1 eV band gap. In this order, S-COP , a metal-free polymeric material was observed as an effective photocatalyst in the solar-driven photocatalytic reaction of heteroarenes with aryl diazonium salts via direct C-H arylation (High yield (∼98 %), and high selectivity (∼98 %)). [ABSTRACT FROM AUTHOR]