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With the increasing demand for ammonia applications, there is a significant focus on improving NH 3 detection performance at room temperature. In this study, we introduce a groundbreaking NH 3 gas sensor based on Cu(I)-based coordination polymers, featuring semiconducting, single stranded 1D-helical nanowires constructed from Cu-Cl and N -methylthiourea (MTCP). The MTCP demonstrates an exceptional response to NH 3 gas (>900% at 100 ppm) and superior selectivity at room temperature compared to current materials. The interaction mechanism between NH 3 and the MTCP sensor is elucidated through a combination of empirical results and computational calculations, leveraging a crystal-determined structure. This reveals the formation of NH 3 -Cu and NH 3 -H 3 C complexes, indicative of a thermodynamically favorable reaction. Additionally, Ag-doped MTCP exhibits higher selectivity and a response over two times greater than the original MTCP, establishing it as a prominent NH 3 detection system at room temperature.

A new series of four-coordinate boron compounds bearing a photochromic dithienylethene-containing C^C ligand and an ancillary N^C ligand have been successfully designed and synthesised. These compounds exhibit reversible photochromism upon photoexcitation with percentage conversions of 71-96% and readily tuneable photocycloreversion quantum yields by convenient modification of the ancillary ligand to turn on the thermally activated upconversion from the lower-lying unreactive excited state to the higher-lying photoreactive excited state.

A class of acceptor-donor-acceptor chromophoric small-molecule non-fullerene acceptors, 1-4 , with difluoroboron(iii) β-diketonate (BF 2 bdk) as the electron-accepting moiety has been developed. Through the variation of the central donor unit and the modification on the peripheral substituents of the terminal BF 2 bdk acceptor unit, their photophysical and electrochemical properties have been systematically studied. Taking advantage of their low-lying lowest unoccupied molecular orbital energy levels (from -3.65 to -3.72 eV) and relatively high electron mobility (7.49 × 10 -4 cm 2 V -1 s -1 ), these BF 2 bdk-based compounds have been employed as non-fullerene acceptors in organic solar cells with maximum power conversion efficiencies of up to 4.31%. Moreover, bistable resistive memory characteristics with charge-trapping mechanisms have been demonstrated in these BF 2 bdk-based compounds. This work not only demonstrates for the first time the use of a boron(iii) β-diketonate unit in constructing non-fullerene acceptors, but also provides more insights into designing organic materials with multi-functional properties., Competing Interests: There are no conflicts to declare., (This journal is © The Royal Society of Chemistry.)

Alkyl-substituted carbene (CHR or CR 2 , R = alkyl) complexes have been extensively studied for alkylcarbene (CHR) ligands coordinated with high-valent early transition metal ions (a.k.a. Schrock carbenes or alkylidenes), yet dialkylcarbene (CR 2 ) complexes remain less developed with bis(dialkylcarbene) species being little (if at all) explored. Herein, several group 8 metal porphyrin dialkylcarbene complexes, including Fe- and Ru-mono(dialkylcarbene) complexes [M(Por)(Ad)] ( 1a,b , M = Fe, Por = porphyrinato dianion, Ad = 2-adamantylidene; 2a,b , M = Ru) and Os-bis(dialkylcarbene) complexes [Os(Por)(Ad) 2 ] ( 3a-c ), are synthesized and crystallographically characterized. Detailed investigations into their electronic structures reveal that these complexes are formally low-valent M(ii)-carbene in nature. These complexes display remarkable thermal stability and chemical inertness, which are rationalized by a synergistic effect of strong metal-carbene covalency, hyperconjugation, and a rigid diamondoid carbene skeleton. Various spectroscopic techniques and DFT calculations suggest that the dialkylcarbene Ad ligand is unique compared to other common carbene ligands as it acts as both a potent σ-donor and π-acceptor; its unique electronic and structural features, together with the steric effect of the porphyrin macrocycle, make its Fe porphyrin complex 1a an active and robust catalyst for intermolecular diarylcarbene transfer reactions including cyclopropanation (up to 90% yield) and X-H (X = S, N, O, C) insertion (up to 99% yield) reactions., (This journal is © The Royal Society of Chemistry 2020.)

We report the first examples of ruthenium complexes cis -[(N 4 )Ru III Cl 2 ] + and cis -[(N 4 )Ru II (OH 2 ) 2 ] 2+ supported by chiral tetradentate amine ligands (N 4 ), together with a high-valent cis -dioxo complex cis -[(N 4 )Ru VI (O) 2 ] 2+ supported by the chiral N 4 ligand mcp (mcp = N , N '-dimethyl- N , N '-bis(pyridin-2-ylmethyl)cyclohexane-1,2-diamine). The X-ray crystal structures of cis -[(mcp)Ru III Cl 2 ](ClO 4 ) ( 1a ), cis -[(Me 2 mcp)Ru III Cl 2 ]ClO 4 ( 2a ) and cis -[(pdp)Ru III Cl 2 ](ClO 4 ) ( 3a ) (Me 2 mcp = N , N '-dimethyl- N , N '-bis((6-methylpyridin-2-yl)methyl)cyclohexane-1,2-diamine, pdp = 1,1'-bis(pyridin-2-ylmethyl)-2,2'-bipyrrolidine)) show that the ligands coordinate to the ruthenium centre in a cis -α configuration. In aqueous solutions, proton-coupled electron-transfer redox couples were observed for cis -[(mcp)Ru III (O 2 CCF 3 ) 2 ]ClO 4 ( 1b ) and cis -[(pdp)Ru III (O 3 SCF 3 ) 2 ]CF 3 SO 3 ( 3c' ). Electrochemical analyses showed that the chemically/electrochemically generated cis -[(mcp)Ru VI (O) 2 ] 2+ and cis -[(pdp)Ru VI (O) 2 ] 2+ complexes are strong oxidants with E ° = 1.11-1.13 V vs. SCE (at pH 1) and strong H-atom abstractors with D O-H = 90.1-90.8 kcal mol -1 . The reaction of 1b or its ( R , R )-mcp counterpart with excess (NH 4 ) 2 [Ce IV (NO 3 ) 6 ] (CAN) in aqueous medium afforded cis -[(mcp)Ru VI (O) 2 ](ClO 4 ) 2 ( 1e ) or cis -[(( R , R )-mcp)Ru VI (O) 2 ](ClO 4 ) 2 ( 1e* ), respectively, a strong oxidant with E (Ru VI/V ) = 0.78 V ( vs. Ag/AgNO 3 ) in acetonitrile solution. Complex 1e oxidized various hydrocarbons, including cyclohexane, in acetonitrile at room temperature, affording alcohols and/or ketones in up to 66% yield. Stoichiometric oxidations of alkenes by 1e or 1e* in t BuOH/H 2 O (5 : 1 v/v) afforded diols and aldehydes in combined yields of up to 98%, with moderate enantioselectivity obtained for the reaction using 1e* . The cis -[(pdp)Ru II (OH 2 ) 2 ] 2+ ( 3c )-catalysed oxidation of saturated C-H bonds, including those of ethane and propane, with CAN as terminal oxidant was also demonstrated.

The Pt(II) complexes (1-3) bearing tetradentate O^N^C^N ligands display high emission quantum yields (0.76-0.90) and good thermal stability (T(d) > 400 °C). Complex is an excellent green phosphorescence dopant for OLEDs with excellent efficiency and low efficiency roll-off (η(L), η(Ext)(max) = 66.7 cd A(-1), 18.2%; η(L), η(Ext) (1000 cd m(-2)) = 65.1 cd A(-1), 17.7%).

Insoluble CuMePc nanocrystals were incorporated into P3HT:PCBM bulk heterojunction photovoltaic cells to increase the carrier mobility and photon harvesting. The P1C1-based (weight ratio of P3HT: CuMePc = 1:1) OPV cell exhibited the best photovoltaic performance with a J(SC) of 16.3 mA cm(-2), V(OC) of 0.58 V, FF of 0.56 and PCE of 5.3%., (This journal is © The Royal Society of Chemistry 2011)

Eight homoleptic metal(III) arylchalcogenolate polymers [M(EPh-p-X)(3)](n) (M = Ru, Cr, and Mo) were characterized by PXRD. Structural solution of [Ru(SPh-p-tBu)(3)](n)1 was achieved by Rietveld refinement of the PXRD data. Pyrolysis of [Ru(SePh)(3)](n)4 produced nanostructured RuSe(2), which selectively catalyzed the reduction of nitro compounds in the presence of other functionalities., (This journal is © The Royal Society of Chemistry 2011)

An unprecedented 2-D Cu-S network is constructed by self-assembly coordination between Cu(I) and 4-hydroxythiophenol and its structure was determined by using powder X-ray diffraction data. The self-assembled coordination network displays ionic behavior with a bulk electrical conductivity value of 120 S cm(-1).