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Palm oil mill effluent (POME) is a substantial by-product generated in the palm oil industry that has traditionally been regarded as waste due to its high pollutant content. However, recent advances emphasize the possibility of recovering valuable resources from POME, which would contribute to environmental sustainability and economic benefits. This made POME treatment the subject of numerous investigations. Various methods, mostly biological, have evolved over the past few years for the successful valorization of POME to produce useful resources including biofuels (biohydrogen, biogas, bioacetone, biobutanol, bioethanol, biohythane etc.), value-added chemicals (enzymes, volatile fatty acids, citric acid, carotenes, lipids etc.), nutrients (micronutrients, macronutrients), pesticides, solvents, and adsorbents. The current review’s objective is to summarize the possible approaches for conversion of POME waste to wealth with some outlooks. By transforming waste into valuable resources, the palm oil sector can improve its sustainability, minimize environmental footprints, and establish new revenue streams.

Coating cotton fabrics with silver nanoparticles (AgNPs) will produce a multifunctional fabric. Additional functions such as antibacterial, antifungal, UV protector, sensor, and wound dressing can be improved by adding AgNPs to the cotton fabric. The functionalization can be performed by various techniques, such as pad-drying, dip-drying, or sonochemical, where the AgNPs were produced by phytosynthesis or utilizing plant extracts as a reducing agent, and this has been reported by many researchers in the past. This review systematically extracts and critically discusses the available published information on the functionalization of cotton fabrics with phytosynthesized-AgNPs from the Scopus database. Future challenges in fabricating multifunctional cotton with AgNPs were also discussed, including obtaining stable and permanent AgNPs immobilization on cotton fabric and developing additional or new functions.

Abstract This study is a simple method for rapid sample preparation before instrumental experiment, which is an important tool and the main step in an analytical proceeding. Till now, different sample preparation procedures based on solid‐phase extraction manner were developed to isolate different types of analytes from different matrices. In this method, the preconcentration and removal of trace amounts of Hg (II) ion in aqueous samples with nanotubes functionalized carboxyl are displayed. The analysis of Hg2+ ions concentration in water solutions was accomplished by flame atomic absorption spectroscopy. Some parameters including the pH, value, and type of desorption eluent solvent, extraction time, ions effect etc. were optimized. The Freundlich, Langmuir, Temkin, and Dubinin–Radushkevich models were employed to estimate Hg (II) ions adsorption. The Freundlich model was obtained from the study of isotherm studies. The kinetic studies demonstrate the adsorption of Hg (II) ions by adsorbent fitted with the pseudo‐second‐order type and resulting from that chemisorption is the rate‐limiting process in the Hg (II) adsorption. The concentration parameter such as level of detection of proposed method, and relative standard deviation test were obtained as 20.83, 6 µg L−1, and 1.16%, respectively.

Oil palm agro-industry is a major revenue earner for Malaysia with the country being one of the major producers of crude palm oil (CPO) and oil palm products. Its growth has, however, led to massive water consumption and high generation of highly polluting palm oil mill effluent (POME). The inadequacies of ponding system adopted by most palm oil mills (POMs) for the treatment of POME to alleviate environmental and public health concerns are quite alarming. Fenton advanced oxidation technologies are a current research area providing viable alternatives for POME treatment, recovery and managing high demand for water. Its major setback is the generation of a large amount of unwanted sludge of iron (III) complexes thus increasing the costs of sludge management, treatment, and disposal. The salient and promising features of this technique for industrial applications motivate researchers to find ways to overcome its inherent drawbacks. This brief review aimed at discussing and evaluating the performances of the various Fenton oxidation processes, including homogeneous, heterogeneous, photo-Fenton, electro-Fenton, sono-Fenton etc., for POME treatment. Discussions on the future direction of these Fenton processes points towards the utilization of abundant magnetically separable heterogeneous composites as catalysts with high stability, activity, recyclability, and cost-effectiveness for decontamination of POME and other agro-industrial effluents from recalcitrant organic pollutants. The low deployment of such composite catalyst coupled with scarce literature on POME treatment in this regard offers a vast opportunity for research exploration.

Sustainable water processing techniques have been extensively investigated and are capable of improving water quality. Among the techniques, photocatalytic technology has shown great potential in recent years as a low cost, environmentally friendly and sustainable technology. However, the major challenge in the industrial development of photocatalyst technology is to develop an ideal photocatalyst which must have high photocatalytic activity, a large specific surface area, harvest sunlight and shows recyclability. Keeping these views, the present review highlighted the synthesis approaches of graphene/metal oxide nanocomposite, characterization techniques and their prominent applications in photocatalysis. Various parameters such as photocatalyst loading, structure of photocatalyst, temperature, pH, effect of oxidizing species and wavelength of light were addressed which could affect the rate of degradation. Moreover, the formation of intermediates during photo-oxidation of organic pollutants using these photocatalysts is also discussed. The analysis concluded with a synopsis of the importance of graphene-based materials in pollutant removal. Finally, a brief overview of the problems and future approaches in the field is also presented.

Herein, the role of metal-based nanoparticles (NPs) in biomedical analysis and the treatment of critical deceases been highlighted. In the world of nanotechnology, noble elements such as the gold/silver/palladium (Au/Ag/Pd) NPs are the most promising emerging trend to design bioengineering materials that could to be employed as modern diagnostic tools and devices to combat serious diseases. NPs are considered a powerful and advanced chemical tool to diagnose and to cure critical ailments such as HIV, cancer, and other types of infectious illnesses. The treatment of cancer is the most significant application of nanotechnology which is based on premature tumor detection and analysis of cancer cells through Nano-devices. The fascinating characteristic properties of NPs—such as high surface area, high surface Plasmon resonance, multi-functionalization, highly stable nature, and easy processing—make them more prolific for nanotechnology. In this review article, the multifunctional roles of Au/Ag/Pd NPs in the field of medical science, the physicochemical toxicity dependent properties, and the interaction mechanism is highlighted. Due to the cytotoxicity of Ag/Au/Pd NPs, the conclusion and future remarks emphasize the need for further research to minimize the toxicity of NPs in the bio-medicinal field.

The influence of variable reaction time (tr) on surface/textural properties (surface area, total pore volume, and pore diameter) of carbon-encapsulated magnetite (Fe3O4@C) nanocomposites fabricated by a hydrothermal process at 190 °C for 3, 4, and 5 h was studied. The properties were calculated using the Brunauer–Emmett–Teller (BET) isotherms data. The nanocomposites were characterised using Fourier transform infrared spectroscopy, X-ray diffraction analysis, thermogravimetry, and scanning and transmission electron microscopies. Analysis of variance shows tr has the largest effect on pore volume (F value = 1117.6, p value < 0.0001), followed by the surface area (F value = 54.8, p value < 0.0001) and pore diameter (F value = 10.4, p value < 0.001) with R2-adjusted values of 99.5%, 88.5% and 63.1%, respectively. Tukey and Fisher tests confirmed tr rise to have caused increased variations in mean particle sizes (11–91 nm), crystallite sizes (5–21 nm), pore diameters (9–16 nm), pore volume (0.017–0.089 cm3 g−1) and surface area (7.6–22.4 m2 g−1) of the nanocomposites with individual and simultaneous confidence limits of 97.9 and 84.4 (p-adj < 0.05). The nanocomposites’ retained Fe–O vibrations at octahedral (436 cm−1) and tetrahedral (570 cm−1) cubic ferrite sites, modest thermal stability (37–60 % weight loss), and large volume-specific surface area with potential for catalytic application in advanced oxidation processes.

A structural study of epoxidized natural rubber (ENR-50) and its cyclic dithiocarbonate derivative was carried out using NMR spectroscopy techniques. The overlapping 1H-NMR signals of ENR-50 at δ 1.56, 1.68–1.70, 2.06, 2.15–2.17 ppm were successfully assigned. In this work, the 13C-NMR chemical shift assignments of ENR-50 were consistent to the previously reported work. A cyclic dithiocarbonate derivative of ENR-50 was synthesized from the reaction of purified ENR-50 with carbon disulfide (CS2), in the presence of 4-dimethylaminopyridine (DMAP) as catalyst at reflux temperature. The cyclic dithiocarbonate formation involved the epoxide ring opening of the ENR-50. This was followed by insertion of the C–S moiety of CS2 at the oxygen attached to the quaternary carbon and methine carbon of epoxidized isoprene unit, respectively. The bands due to the C=S and C–O were clearly observed in the FTIR spectrum while the 1H-NMR spectrum of the derivative revealed the peak attributed to the methylene protons had split. The 13C-NMR spectrum of the derivative further indicates two new carbon peaks arising from the >C=S and quaternary carbon of cyclic dithiocarbonate. All other 1H- and 13C-NMR chemical shifts of the derivative remain unchanged with respect to the ENR-50.

Plasticised poly(vinyl chloride)-based membranes containing the ionophores (α-, β- and γ-cyclodextrins (CD), dibenzo-18-crown-6 (DB18C6) and dibenzo-30-crown-10 (DB30C10) were evaluated for their potentiometric response towards promethazine (PM) in a flow injection analysis (FIA) set-up. Good responses were obtained when β- and γ-CDs, and DB30C10 were used. The performance characteristics were further improved when tetrakis(4-chlorophenyl) borate (KTPB) was added to the membrane. The sensor based on β-CD, bis(2-ethylhexyl) adipate (BEHA) and KTPB exhibited the best performance among the eighteen sensor compositions that were tested. The response was linear from 1 x 10−5 to 1 x 10−2 M, slope was 61.3 mV decade−1, the pH independent region ranged from 4.5 to 7.0, a limit of detection of 5.3 x 10−6 M was possible and a lifetime of more than a month was observed when used in the FIA system. Other plasticisers such as dioctyl phenylphosphonate and tributyl phosphate do not show significant improvements in the quality of the sensors. The promising sensors were further tested for the effects of foreign ions (Li+, Na+, K+, Mg2+, Ca2+, Co2+, Cu2+, Cr3+, Fe3+, glucose, fructose). FIA conditions (e.g., effects of flow rate, injection volume, pH of the carrier stream) were also studied when the best sensor was used (based on β-CD). The sensor was applied to the determination of PM in four pharmaceutical preparations and human urine that were spiked with different levels of PM. Good agreement between the sensor and the manufacturer’s claimed values (for pharmaceutical preparations) was obtained, while mean recoveries of 98.6% were obtained for spiked urine samples. The molecular recognition features of the sensors as revealed by molecular modelling were rationalised by the nature of the interactions and complexation energies between the host and guest molecules.

The reaction of benzo-15-crown-5 (C14H20O5) ligand with La(NO3)3.7H2O in the presence of HBr has resulted in the production of an exotic sandwich complex, [LaC28H36Br4O10][3Br]. The crystal system is triclinic with space group P1 , a = 12.5834(14) Å, b = 13.5816(16) Å, c = 13.8403(16) Å, a = 70.751(2)°, b = 66.773(2)° and g = 67.631(2)°. The cation comprises of the lanthanum atom coordinated to two crowns via three oxygen atoms from each crown in a η3-sandwich fashion. The two phenyl groups of the crown are brominated. The La-OLigand bond lengths are between 2.857(7) and 2.949(7) Å. The trianion [3Br]3- is linear with Br-Br bond lengths of 2.518(2) and 2.560(2) Å respectively. The molecule is stabilized by intermolecular interactions of the type C-H...Br to form dimers and are arranged parallel to bc face. Keywords: lanthanum, benzo-15-crown-5, hydrogen bonding, bromination, x-ray structure

In this study, iron impregnated activated carbon (FeAC) was synthesized following an oxidation and iron impregnation of activated carbon (AC). Both the AC and FeAC were characterized by pHZPC and FTIR spectroscopy. The removal of Methylene Blue (MB) by AC and FeAC was examined under various experimental conditions. The FeAC showed up to 95% (higher than AC) MB removal in the pH range of 7-10. Although the reaction kinetics was pseudo-second order, the overall rate was controlled by a number of processes such as film diffusion, pore diffusion and intraparticle diffusion. The activation energy values for the MB uptake by AC and FeAC (21.79 and 14.82 kJ/mol, respectively) revealed a physisorption process. In the regeneration study, FeAC has shown consistently ≥ 90% MB removal even up to 10 repeated cycles. The reusable characteristic of the spent FeAC improved the practical use of activated carbon and can be a breakthrough for continuous flow system applications where it can work effectively without any significant reduction in its performance.

Calcium oxide (CaO) nanoparticles are known to exhibit unique property due to their high adsorption capacity and good catalytic activity. In this work the CaO nanocatalysts were prepared by hydrothermal method using anionic surfactant, sodium dodecyl sulphate (SDS), as a templating agent. The as-synthesized nanocatalysts were further used as substrate for the synthesis of alumina doped calcium oxide (Al2O3·CaO) nanocatalysts via deposition-precipitation method at the isoelectric point of CaO. The Al2O3·CaO nanocatalysts were characterized by FTIR, XRD, TGA, TEM, and FESEM techniques. The catalytic efficiencies of these nanocatalysts were studied for the photodegradation of 2,4,6-trinitrophenol (2,4,6-TNP), which is an industrial pollutant, spectrophotometrically. The effect of surfactant and temperature on size of nanocatalysts was also studied. The smallest particle size and highest percentage of degradation were observed at critical micelle concentration of the surfactant. The direct optical band gap of the Al2O3·CaO nanocatalyst was found as 3.3 eV.

Chemical synthesis of Ag-NPs was carried out using reduction method. The reduction mechanistic approach of silver ions was found to be a basic clue for the formation of the Ag-NPs. The nanoparticles were characterized by UV-vis, FT-IR and TEM analysis. We had designed some experiments in support of our hypothesis, "low concentrations of novel nanoparticles (silver and gold) increases the activity of plant peroxidases and alter their structure also", we had used Ag-NPs and HRP as models. The immobilization/interaction experiment had demonstrated the specific concentration range of the Ag-NPs and within this range, an increase in HRP activity was reported. At 0.08 mM concentration of Ag-NPs, 50% increase in the activity yield was found. The U.V-vis spectra had demonstrated the increase in the absorbance of HRP within the reported concentration range (0.06-0.12 mM). Above and below this concentration range there was a decrease in the activity of HRP. The results that we had found from the fluorescence spectra were also in favor of our hypothesis. There was a maximum increase in ellipticity and α-helix contents in the presence of 0.08 mM concentration of Ag-NPs, demonstrated by circular dichroism (CD) spectra. Finally, incubation of a plant peroxidase, HRP with Ag-NPs, within the reported concentration range not only enhances the activity but also alter the structure.

In the title compound, C15H14N2O4, the N=C double bond has an E configuration. The two benzene rings make a dihedral angle of 28.59 (6)°. In the crystal, molecules are linked into a three-dimensional network by intermolecular N—H...O, O—H...O and C—H...O hydrogen bonds and stabilized by weak C—H...π interactions.

The title compound, 0.75C15H14N2O·0.25C15H14N2O, is a co-crystal of 2-methyl-6-(6-methyl-1H-benzimidazol-2-yl)phenol as the major component and 2-methyl-6-(5-methyl-1H-benzimidazol-2-yl)phenol as the minor component. The refined site-occupancy ratio is 0.746 (4)/0.254 (4). The conformations of both components are identical except for that of the methyl substituent on the benzene ring of the benzimidazole unit which is positionally disordered over two positions. The molecule is essentially planar, the dihedral angle between the benzimidazole plane and the benzene ring being 3.49 (4)°. An intramolecular O—H...N hydrogen bond generates an S(6) ring motif. In the crystal packing, molecules are linked through N—H...O hydrogen bonds into chains along [201]. These chains are stacked approximately along the a-axis direction. The crystal packing is further stabilized by weak N—H...O and O...H...N hydrogen bonds, together with weak intermolecular C—H...π interactions. A π–π interaction with a centroid–centroid distance of 3.6241 (6) Å is also observed between the substituted phenyl ring and that of the benzimidazole system.

The molecule of the title Schiff base compound, C28H32N2O2, has a twisted geometry, the dihedral angles between the central benzene ring and the other two benzene rings being 29.12 (14) and 26.01 (14)°. Four intramolecular C—H...O hydrogen bonds and two intramolecular O—H...N hydrogen bonds stabilize the molecular structure. In the crystal packing, molecules are stacked along the a axis and stabilized by π–π interactions [centroid–centroid distance = 3.6724 (17) Å]. The crystal studied was found to be a non-merohedral twin, the refined ratio of twin components being 0.374 (5):0.626 (5).

The asymmetric unit of the title Schiff base complex, [Mn(C36H46N2O2)Cl], comprises two crystallographically independent molecules. The MnIII centre in each molecule adopts a distorted square-pyramidal geometry. Each MnIII ion is coordinated by the N2O2 atoms of the tetradentate Schiff base ligand forming the basal plane and the coordinated chloride anion occupies the apical position. Four bifurcated intramolecular C—H...O contacts stabilize the molecular structure. In the crystal packing, molecules are linked into dimers via intermolecular C—H...Cl contacts and further stabilized by C—H...π interactions. The crystal studied was a non-merohedral twin, the refined ratio of the twin components being 0.441 (1):0.559 (1).

In the title compound, {[Nd(C8H3NO6)(C8H4NO6)(H2O)2]·2.5H2O}n, the NdII ion is nine-coordinated by seven O atoms from five carboxylate groups and two water molecules. The [Nd(C8H3NO6)(H2O)2]2+ units are bridged by 5-nitroisophthalate dianions, forming polymeric sheets parallel to the ab plane. The polymeric sheets are linked into a three-dimensional network by O—H...O and C—H...O hydrogen bonds, and π–π interactions [centroid–centroid distance = 3.5533 (11) Å]. The 5-nitroisophthalate(1−) anion is disordered over three positions with an occupancy ratio of 0.68:0.23:0.09. Two of the uncoordinated water molecules are disordered over two positions, with occupancy ratios of 0.722 (15):0.278 (15) and 0.279 (6):0.221 (6), respectively.

The asymmetric unit of the title Schiff base compound, C21H18N2O4, consists of four independent zwitterions (A, B, C and D) with similar conformations. In each independent molecule, the methyl group is disordered over two positions; the occupancies of the two positions are 0.819 (5) and 0.181 (5) in molecule A, 0.912 (5) and 0.088 (5) in B, 0.734 (5) and 0.266 (5) in C, and 0.940 (6) and 0.060 (6) in D. The dihydroxyphenyl and the hydroxyphenolate rings in molecule A form dihedral angles of 17.36 (12) and 13.30 (12)°, respectively, with the central benzene ring, whereas the respective angles for molecules B, C and D are 30.22 (11)/7.46 (11), 35.26 (12)/11.01 (12) and 39.89 (12)/4.29 (12)°. In all independent molecules, intramolecular N—H...O and O—H...N hydrogen bonds generate S(6) ring motifs. The four independent molecules are linked into two pairs, viz. A–B and C–D, by intermolecular O—H...O hydrogen bonds. These pairs are linked into a two-dimensional network parallel to the ab plane by C—H...O hydrogen bonds. In addition, C—H...π and π–π [centroid–centroid distance = 3.5153 (14)–3.7810 (15) Å] interactions stabilize the crystal structure.

In the title molecule, C15H14N2O2, the substituted benzene ring forms a dihedral angle of 4.15 (1)° with the benzimidazole ring system. An intramolecular O—H...N hydrogen bond generates an S(6) ring motif. In the solid state, molecules are linked into chains along the [001] via intermolecular bifurcated N—H...(O,O) hydrogen bonds, which generate R12(5) ring motifs. The crystal packing is also consolidated by C—H...π interactions, and π–π stacking interactions between the imidazole and substituted benzene rings [centroid–centroid distance = 3.5746 (13) Å]. The methyl group attached to the benzimidazole ring system is disordered over two positions with occupancies of 0.587 (6) and 0.413 (6), suggesting 180° rotational disorder for the benzimidazole group.

In the title molecule, C20H16N2O2, the benzimidazole mean plane forms dihedral angles of 56.55 (3) and 81.65 (4)° with the two benzene rings. In the crystal structure, intermolecular O—H...O and O—H...N hydrogen bonds link the molecules into layers parallel to the (101) plane. The crystal packing also exhibits weak intermolecular C—H...O and C—H...π interactions.

The asymmetric unit of the title compound, tetraaquatetrakis{μ3-6,6′-dioxido-2,2′-[1,2-phenylenebis(nitrilomethylidyne)]diphenolato}octazinc(II) dimethyl sulfoxide tetrasolvate dihydrate, [Zn8(C20H12N2O4)4(H2O)4]·4C2H6OS·2H2O, contains one quarter of a ZnII octanuclear complex with overline4 symmetry, one dimethyl sulfoxide molecule and one half of a water molecule which lies on a twofold rotation axis. The ZnII atoms of the octanuclear complex have two different five-coordinate environments, viz. ZnN2O3 and ZnO5. All eight ZnII centers adopt a distorted square-pyramidal coordination; four ZnII ions have the N2O2 tetradentate Schiff base ligand bound in a basal plane and the coordinated water molecule occupying the apical site, while the remaing four ZnII ions are bound by five O atoms from three Schiff base ligands. In the crystal structure, ZnII complex molecules, coordinated and uncoordinated water molecules and dimethyl sulfoxide molecules are linked via O—H...O and C—H...O hydrogen bonds and C—H...À interactions, forming a three-dimensional framework.

The asymmetric unit of the title compound, C20H16N2O4·CH3OH, contains two Schiff base zwitterions and two methanol solvent molecules. The dihedral angles between the central benzene ring and the two outer benzene rings of the Schiff base are 2.57 (7) and 52.30 (7)° in one molecule and 5.83 (7) and 49.82 (7)° in the other molecule. Intramolecular O—H...N and N—H...O hydrogen bonds generate S(6) ring motifs, whereas intramolecular N—H...N hydrogen bonds generate S(5) ring motifs. In the crystal structure, O—H...O, hydrogen bonds and weak C—H...O interactions link the molecules into one-dimensional chains along the b-axis direction and are further connected by O—H...O and weak C—H...O interactions into a three-dimensional network. C—H...π and π–π interactions [centroid–centroid distances = 3.6228 (9) and 3.6881 (9) Å] are also observed in the crystal structure.

The title compound, [La2(C8H5NO4)3(H2O)2]n, is a three-dimensional network coordination polymer in which each LaIII ion is nine-coordinated by eight carboxylate O atoms from six 5-aminoisophthalate ligands and one O atom from a water molecule. One organic ligand lies on a twofold rotation axis. O—H...O, O—H...N and N—H...O hydrogen bonds are observed in the crystal structure.

The asymmetric unit of the title complex, [Mn(C28H30N2O2)Cl(H2O)][Mn(C28H30N2O2)Cl(CH3OH)], contains two discrete MnIII complexes of a Schiff base ligand, with an N2O2 donor set. Both MnIII centers are in a distorted octahedral geometry with the N2O2 donor atoms of the tetradentate Schiff base dianion in the equatorial plane. The axial positions in the coordination environment of one MnIII complex are occupied by a chloride ion and a water molecule, but a methanol molecule replaces the water molecule in the other complex. The coordinated water molecule takes part in an O—H...Cl hydrogen bond between the two MnIII complexes. In the crystal structure, O—H...Cl hydrogen bonds link the molecules into infinite one-dimensional chains along the [100] direction. The crystal structure is stabilized by O—H...Cl hydrogen bonds together with weak C—H...O and C—H...Cl interactions. A C—H...π interaction is also observed in the crystal structure.

The molecule of the title compound, [Zn(C28H30N2O2)(CH3COCH3)], lies across a mirror plane with the ZnII ion and the acetone molecule on the mirror plane. The ZnII ion is in a five-coordinate distorted square-pyramidal N2O3 environment, with the two imine N and two phenolic O atoms of the tetradentate Schiff base dianion in the basal plane and the acetone molecule in the apical position. The central benzene ring makes a dihedral angle of 16.5 (2)° with the two outer phenolate rings. In the crystal structure, the molecules are arranged into antiparallel columns along the a axis.

In the title complex, [Mn(C22H18N2O4)Cl], the MnIII centre is in a distorted square-pyramidal configuration, with the basal plane formed by the N2O2 donors of the tetradentate Schiff base dianion; the two phenolate O atoms and the two imine N atoms are each mutually cis. The chloride ion occupies the apical position. The dihedral angle between the two outer phenolate rings of the tetradentate Schiff base ligand is 16.44 (9)°. The central benzene ring makes dihedral angles of 10.64 (9) and 25.17 (10)° with the two outer phenolate rings. In the crystal structure, weak C—H...O and C—H...Cl interactions link the molecules into wave-like face-to-face double layers along the c direction. A π–π interaction involving the two outer phenolate rings is observed, the centroid–centroid distance being 3.743 (11) Å.

In the Schiff base molecule of the title compound, C36H48N2O2·C3H6O, the central benzene ring makes dihedral angles of 46.64 (10) and 49.34 (10)° with the two outer benzene rings, and the two outer benzene rings form an angle of 39.13 (8)°. There are two intramolecular O—H...N hydrogen bonds involving the two hydroxy groups, which generate S(6) ring motifs. In the crystal structure, the Schiff base molecules are linked into a chain along the a axis by C—H...π interactions. The acetone solvent molecules are attached to the chain via C—H...O hydrogen bonds.

In the title complex, [Mn(C20H12Cl2N2O2)Cl(CH3OH)], the MnIII atom is in an octahedral coordination geometry with the N2O2 atoms of the doubly-deprotonated Schiff base forming a square around it. The chloride ion and the O atom of the methanol molecule occupy the other two positions of the octahedron. The dihedral angle between the two outer phenolate rings of the tetradentate ligand is 20.27 (12)°. The central phenylene ring makes dihedral angles of 18.62 (12) and 6.02 (12)° with the two outer phenolate rings. Hydrogen bonds of the O—H...Cl type link the molecules into an infinite chain along [010]. These chains are arranged into sheets parallel to the ab plane and these sheets are connected by weak C—H...Cl interactions into a three-dimensional network. The crystal structure is further stabilized by C—H...π interactions.