A 1-(4-methylphenyl)piperazinyl dithiocarbamato-S,S' Zn(ii) complex was prepared, and its molecular structure was determined using single-crystal X-ray crystallography. The zinc(ii) dithiocarbamate compound crystallized as a dimeric structure with two zinc(ii) ions that are coordinated to two molecules of 1-(4-methylphenyl)piperazinyl dithiocarbamato anions as bidentate chelating ligands. In addition, the sulfur atom of the adjacent centrosymmetric molecule is coordinated to the adjacent Zn(ii) ion. The geometry and electronic properties optimized using DFT and the HOMO-LUMO energies matched the experimental findings. The complex was thermolyzed in octadecylamine (ODA), dodecylamine (DDA), and hexadecylamine (HDA) to prepare zinc sulfide nanoparticles: ZnS-ODA, ZnS-DDA, and ZnS-HDA. The as-prepared zinc sulfide nanoparticles were used as photocatalysts for the degradation of trypan blue and rhodamine 6G dyes. The photocatalytic degradation of trypan blue by ZnS-ODA showed the highest photocatalytic efficiency of 95.71%, while ZnS-DDA degraded 83.21% of rhodamine 6G after 180 min. The degradation process followed pseudo-first-order kinetics with rate constants of 1.69 × 10-2 min-1, 5.18 × 10-3 min-1, and 6.75 × 10-3 min-1 for trypan blue dye and 3.54 × 10-3 min-1, 7.44 × 10-3 min-1, and 6.21 × 10-3 min-1 for rhodamine 6G dye by ZnS-ODA, ZnS-DDA, and ZnS-HDA, respectively. The results indicate the potential of the as-prepared ZnS nanoparticles as effective photocatalysts for trypan blue and rhodamine 6G dyes degradation.

In this study, we present the synthesis, density functional theory (DFT) analysis, Hirschfeld surface analysis, in silico docking, and drug-likeness evaluation of 142-(diphenylphosphanyl)pheny1]-N-(4-methoxyphenyl)metha-nimine as a potential dual inhibitor of human topoisomerase II and the SARS-CoV-2 main protease. The compound was synthesized and characterised by spectroscopic studies and single-crystal X-ray crystallography. The compound crystallizes in the monoclinic crystal system with the P2i/c space group. Its optimized molecular geometry and harmonic vibrational frequencies were calculated using DFT at the B3LYP/6-31 G level, the results are in good agreement with the experimental data. Molecular docking studies revealed strong binding affinities of the compound to the active sites of human topoisomerase IIe (PDB ID: 5GWK, -5.13 kcal/mol), topoisomerase II13 (PDB ID: 4GFH, -6.53 kcal/mol), and the SARS-CoV-2 main protease (PDB ID: 6M0J,-7.02 kcal/mol). Key interactions involved classical hydrogen bonds, carbon-hydrogen bonding, X-7C, and hydrophobic contacts, that indicates the formation of stable ligand-protein complexes. In silico ADMET predictions showed favourable pharmacokinetic properties, with a bioavailability score of 0.55, that suggest 55% of the administered dose will be biologically available for systemic circulation in an active form, with a skin permeability value of-4.54, and good blood-brain barrier permeability. In addition, the compound satisfied Lipinski's rule of five and other drug-likeness criteria, which confirms its therapeutic potential. These findings suggest that this Schiff base-phosphine hybrid has potential as a dual inhibitor for topoisomerase II and the SARS-CoV-2 enzymes. The compound could be derivatized and evaluated as novel therapeutic agent for the treatment of cancer and COVID-19.

Celecoxib is a nonsteroidal anti-inflammatory drug used to reduce pain and inflammation caused by conditions such as arthritis, ankylosing spondylitis and menstrual pain. To enhance its effectiveness and reduce the likelihood of side effects, it is essential to create drug delivery systems designed for better controlled release. We herein report the synthesis of [Cu3(btc)2] using the solvent-based method and characterized using BET, CHN, FTIR, PXRD, SEM, TEM & TGA. [Cu3(btc)2] commonly referred to as HKUST-1/MOF-199 is among the first stable MOFs identified, boasting an exceptionally high surface area. After characterization, the synthesized [Cu3(btc)2] was modified by introducing ED into the framworks to form [Cu3(btc)2]-ED which was characterized by BET, EDX, FT-IR, PXRD, SEM, TEM and TGA. The two porous Cu-MOFs prepared in this study were used for storage and stable delivery of Celecoxib for the first time. The storage capacities of [Cu3(btc)2] and [Cu3(btc)2]-ED were 680.15 mg/g and 504.22 mg/g respectively, which also demonstrates effective and controlled drug delivery properties. The results indicate that the storage capacity of [Cu3(btc)2] is higher than that of [Cu3(btc)2]-ED, which could be attributed to its high pore volume and large surface area. The pharmacokinetics of the two CuMOFs show that Celecoxib was fully delivered after 48 h. Molecular docking shows that celecoxib binds strongly to [Cu3(btc)2] via pi-pi stacking and Cu-centered interactions, while binding in [Cu3(btc)2]-ED is dominated by hydrogen bonding and aromatic contacts. The findings from this research present a novel opportunity for [Cu3(btc)2] and [Cu3(btc)2]-ED to serve as a potential platform for Celecoxib storage and stable delivery.

Correction for ‘Synthesis, crystal structure and DFT studies of a methylphenyl piperazinyl dithiocarbamato zinc( ii ) precursor for zinc sulfide nanophotocatalysts used for the degradation of trypan blue and rhodamine 6G dyes’ by Peter A. Ajibade et al. , RSC Adv. , 2026, 16 , 1848–1862, https://doi.org/10.1039/D5RA04748J.

Iron oxide nanocomposites (Fe3O4@BC-1, Fe3O4@BC-2, and Fe3O4@BC-3) were synthesized via an ultrasound-assisted method at 5, 10, and 15 min to investigate their morphological, optical, and photocatalytic properties. Powder X-ray diffraction (P-XRD) analysis confirmed the formation of Fe3O4 with a cubic spinel structure. TEM analysis revealed that Fe3O4@BC-1 exhibited irregular rod- and plate-like structures with a particle size of 6.4 nm, Fe3O4@BC-2 displayed square-shaped particles with a mean size of 8.3 nm, and Fe3O4@BC-3 consisted of agglomerated particles with a size of 9.8 nm. Optical analysis showed a redshift in absorption peaks from 400 nm (2.36 eV) for Fe3O4@BC-1 to 417 nm (2.28 eV) for Fe3O4@BC-2, and 418 nm (2.32 eV) for Fe3O4@BC-3. The nanocomposites were evaluated as photocatalysts against Congo red (CR) and crystal violet (CV) using response surface methodology. Fe3O4@BC-3 exhibited the highest photocatalytic degradation efficiency of 99.86% of CR under optimal conditions (120 min, 3 mg, 15 ppm, pH 3) and Fe3O4@BC-2 achieved 99.28% degradation of CV under 90 min, 8 mg, and pH 8 for 5 ppm CV. Reactive species analysis confirmed hydroxyl (˙OH) and superoxide radicals (˙O2 -) as the dominant contributors to the dye's degradation.

Two novel copper(II) complexes formulated as [Cu(bzac)(phen)Br](1) and [Cu(bzac)(bipy)Br] (2) were synthesized from the reaction between copper bromide, benzoylacetone, and diimines (1,10-phenanthroline & 2,2 '-bipyridine). The complexes were elucidated by elemental analysis as well as spectroscopic techniques. The crystal structure of complex 2 was determined through single-crystal X-ray crystallography, revealing that it adopts a square pyramidal geometry. Intermolecular interactions that define the stability of the crystal lattice structures were investigated via Hirshfeld surface analysis. Density functional theory (DFT) optimization of 1 and 2 resulted in the expected geometry and confirms their stability. The synthesized compounds demonstrated strong antimicrobial activity against the test microorganisms and hence are potential broad-spectrum antimicrobial agents. Molecular docking simulations were considered between the metal complexes and the antibacterial targets DNA Gyrase, Dihydrofolate Reductase, Transglycosylase, and tyrosyl-tRNA synthetase; and the antifungal targets: the secreted aspartic proteinase and Als3 adhesin. The complexes 1 and 2 gave the most favorable binding energy with all targets with calculated energy in the range -6.28 to -8.59 kcal mol-1. The binding energies were more favorable than the binding energy calculated with the current drugs gentamycin and tioconazole.

Sensitive and rapid electrochemical sensors for bisphenol A (BPA) determination were developed using metal-organic frameworks (MOFs), ternary quantum dots (TQDs), and their composite (TQDs@MOFs). The electrochemical sensors were characterized using FTIR, UV-Vis, SEM, TEM, PL, and single X-ray crystallography. Electrochemical responses using cyclic voltammetry (CV) and differential pulse voltammetry (DPV) reveal that the composite modified electrode has an enhanced response and performed better and faster with the highest oxidation peak current of 2.70 × 10-4 over a suitable potential separation window of 0.939 V. Under optimized conditions and over an examined concentration range from 4 ηM to 16 ηM, the composite modified electrode displays a linear relationship with an increase in concentration with a limit of detection of 1.01 ηM, a limit of quantitation of 3.08 ηM, and a correlation coefficient (R2) of 0.995 (S/N = 3). The composite modified electrode demonstrated good stability, reproducibility, and selectivity in the presence of other interfering substances. The practicability of the composite modified electrode was achieved using real water samples with a percentage recovery of 96.46-101.70% and a relative standard deviation of 3.22-5.06%.

The current paper reports the experimental, photophysical, electrochemical characterization and a preliminary quantum chemical studies evaluation of anti-cancer potential of two mixed-ligand heteroleptic ruthenium(II) complexes containing monodentate 4-imidazoleacrylic acid and bischlorido(triphenylphosphine) tethered with either thiourea or dithiocarbamate moiety obtained in a one-pot reaction synthesis. The complexes formulated as [RuCl2(PPh3)(dtu)(mza) (OH)]: (Y1) and [RuCl2(PPh3)(pex)(mza)]: (ZD2), with (dtu = thiourea, mza = 4-imidazole acrylic acid and pex = dithiocarbamate) were characterized by elemental analysis, FT-IR, UV-Vis, PL, 1H, 13C, 31P NMR and MS. The photophysical properties of the two complexes showed appreciable absorption bands at the UV-Vis absorption region wavelengths lambda max at (284, 373 nm) and weak absorption maxima at 508 and 638 nm indicative of the presence of pi ->pi*, LLCT and MLTC charge transitions. High intensive photoluminescent emission bands are recorded for both complexes Y1 and ZD2 at lambda em 554 and 590 nm respectively, although with Y1 having better luminescent quantum yield (0.71) than ZD2 (0.36) at a common excitation energy. A rapid electrochemical screening study using cyclic voltammogram supported by square-wave voltammogram revealed stronger redox activity negative potential (V) for ZD2 than Y1. Despite the close similarity in chemical structures of the two complexes, the molecular docking/DFT reports showed strong inhibitory constants and binding affinities of complexes Y1 and ZD2 against ER alpha+ (8DU6) and hFR-beta (4KMZ) at -160.749; -142.242 and -144.164; -157.592 respectively when compared to Abemaciclib, being the standard drug at -148.104; -181.067. This work provides firsthand preliminary information on target opportunities aimed at finding new potential bioactive agents with better photostability and high selectivity that could be employed for bioimaging, optical biosensors and/or other emerging applications based on thiourea, dithiocarbamate and 4-imidazoleacrylic acid moieties.

Pure silver nanoparticles (AgNPs) were synthesized using Senecio madagascariensis plant extract and oleic acid as capping agents. The powder X-ray diffraction patterns of the silver nanoparticles were indexed to the face- centred cubic phase of Ag. TEM images of the nanoparticles revealed polydisperse spherical nanoparticles with particle size of 9 to 22 nm range. The GC-MS revealed terpenes as some phytochemicals extracted, which the FTIR bands corroborated. The results confirmed that increase in oleic acid concentration increased the size of the silver nanoparticles. The nanoparticles' optical band gaps, Eg, g , were 2.26 - 2.56 eV, which decreased with particle size. The AgNPs exhibited potential antioxidant activity, as demonstrated by the DPPH scavenging assay. The DPPH scavenging activity was highest, with AgNP1 1 at 80 % and an IC50 50 of 1.668 mu g/mL. Fluorescence and ultraviolet (UV) titrations were used to study the interaction of the silver nanoparticles (AgNP1) 1 ) with bovine serum albumin (BSA). The K app value of the AgNP1 1 was calculated to be 3.14 x 104 4 +/- 0.02 Lmol- 1,- 1 , K SV calculated as 7.38 x 104 4 +/- 0.12 M- 1 . In the study, AgNPs bind to BSA potentially through a static quenching mechanism with one binding site that leads to developing a ground state complex. It is proposed that AgNPs bond to BSA's surface spontaneously based on its thermodynamic characteristics and binding constants.

The current world's life-threatening illnesses have amplified multidrug resistance infections, bringing about immune system mayhem, thus, the quest for novel antimicrobial compounds with a broad spectrum of action. Four Ni(II) complexes, [Ni(YB)Cl]& sdot;2H2O (C1), [Ni(YB)Br]& sdot;H2O (C2), [Ni(YB)NO3]& sdot;3H2O (C3), [Ni(YB)COOCH3]& sdot; 2H2O (C4) [HYB = 4-[(1E)-N-{2-[(Z)-(4-methoxybenzylidene)amino]ethyl}ethanimidoyl]benzene-1,3-diol], were synthesized. Analytical techniques like CHNS analysis, UV-Vis, FT-IR, molar conductance, XRD, 1H NMR, and TGA/DTA were utilized for characterization. The calculated EHOMO - ELUMO energy gap and global reactivity descriptors of the compounds were performed by DFT calculations. The energy gap (Delta E) = EHOMO - EHOMO for the studied compounds HYB, C3, C4, C1, and C2 were found to be 1.736, 1.243, 1.221 1.217, and 1.193 eV respectively. The chelated complexes exhibited higher DPPH radical scavenging power than the corresponding free HYB ligand. Amongst the complexes, C2 displayed the highest scavenging ability (IC50 = 2.59 +/- 1.21 mu M). Antimicrobial activities of the synthesized compounds were validated against bacterial strains: gram (+) E. faecalis and S. aureus; gram (-) P. aeruginosa and K. pneumoniae; and fungi: C. neoformans and C. albicans. C2 exhibited the most inhibition (MIC = 390.6 mu g/mL) against P. aeruginosa and E. faecalis, while C1 acted as the most effective compound (MIC = 48.83 mu g/mL) against the fungi strains. The docking study illustrated the highest binding affinity of -7.30 kcal/mol by C2 with P. aeruginosa (PDB: 8BN6), and C1 for the C. neoformans with -6.04 kcal/mol (PDB ID: 7T08) binding sites. Potential binding modes around the receptor's active sites were predicted by the in silico molecular docking studies.

Magnetite nanoparticles were prepared by co-precipitation at three different temperatures and used as photocatalysts for the degradation of eosin yellow (EY) and quinaldine red (QR) under visible light irradiation. Powder X-ray diffraction confirmed the cubic spinel crystalline structure of iron oxide (Fe3O4). HRTEM images showed Fe3O4 nanoparticles with mean particle sizes of 10.6-12.9 nm. The energy bandgaps of the magnetite nanoparticles obtained from Tauc plots are in the range 2.96-3.36 eV. The photocatalytic degradation of eosin yellow by the Fe3O4-1 nanoparticle shows a maximum efficiency of 89.8%, while Fe3O4-2 degraded 85.9% of quinaldine red after 180 min. Optimal photocatalytic degradation was obtained using 1.2 mg L- 1 with pH 4 being the best for eosin yellow and pH 9 is optimum for quinaldine red degradation. The photostability and reusability of the as-prepared magnetite nanoparticles were examined over four consecutive cycles, which indicate that the degradation efficiency was reduced by 0.11-17.06%. The good photoactivity and photostability under visible light make the system suitable for practical use in the wastewater treatment industries.

The copper-(II) complex of 4-benzylpiperazinyldithiocarbamate was synthesized and characterized by spectroscopic techniques and single crystal X-ray crystallography. The single crystal X-ray structure of the compound revealed a centrosymmetric dimeric molecule with the copper-(II) ions situated in a distorted five-coordinate square pyramidal environment. The complex was used as a single source precursor for the preparation of copper sulfide nanoparticles capped with three capping agents, octadecylamine (ODA), dodecylamine (DDA), and hexadecylamine (HDA) and at three different temperatures, 120 °C, 160 °C and 220 °C. Powder X-ray diffraction patterns confirmed mainly chalcocite crystalline phases of copper sulfide with some minor peaks of roxbyite phase. The optical band gaps for the nanoparticles range from 4.07 to 4.16 eV, with a maximum absorption band edge of 283.7 nm. The morphological studies revealed different shapes ranging from spherical, hexagonal, and irregular shapes with average particle sizes ranging from 4.1 to 74.7 nm. The photocatalytic studies of the nanoparticles under visible light demonstrated an efficient photodegradation of trypan blue dye. Dodecylamine capped copper sulfide nanoparticles (CuS-DDA) and copper sulfide prepared at 120 °C (CuS-120) achieved 99.31% and 99.26% photocatalytic degradation efficiency with a rate constant of 0.03045 and 0.02749 min-1, respectively. Scavenger studies revealed the role of reactive species in trypan blue degradation by copper sulfide nanoparticles. Recyclability experiments showed excellent stability and reusability of the nanoparticles, demonstrating their potential for sustained photocatalytic applications.

Copper(ii) metal-organic frameworks (MOFs) of 4,4',4″-tri-tert-butyl-2,2':6',2″-terpyridine(N3ttb) formulated as [Cu(btc)(N3ttb)]·(DMF)21 and [Cu(N3ttb)(H2O)2] 2 (DMF = dimethylformamide) were synthesized and characterized by elemental analyses, and spectroscopic techniques, and compound 1 was further characterized by single crystal X-ray crystallography. The molecular structure of compound 1 revealed a five-coordinate geometry with three meridional nitrogen atoms of 4,4',4″-tri-tert-butyl-2,2':6',2″-terpyridine and two oxygen atoms of 1,3,5-benzenetricarboxylic acid to form a square pyramidal geometry. Compound 2 was functionalized with 1,2-ethanedithiol (TH) to prepared [Cu(N3ttb)(H2O)2]-TH (compound 3). The copper(ii) metal-organic frameworks (MOFs) were used as adsorbents for the removal of 2,4-dichlorophenoxyacetic acid. The adsorption processes followed pseudo-second-order kinetics, and the adsorption equilibrium data best fit the Langmuir isotherm, with R 2 values of 0.981, 0.991, and 0.991 for 1, 2 & 3 respectively. The quantity of 2,4-dichlorophenoxyacetic acid removed was 588.24, 333.33 and 833.33 mg g-1 over 1, 2 & 3 respectively. The results indicate that the functionalized compound 3 has a higher adsorption capacity than 1 & 2 which could be ascribed to electrostatic interactions between the thiol groups of 1,2-ethanedithiol and the carboxylic acid group of 2,4-dichlorophenoxyacetic acid. Computational studies revealed that 3 outperforms 1 & 2 in herbicide adsorption, this can be adjudged to its ultra-soft character (η = 0.31 eV, S = 1.61 eV-1), high electrophilicity (ω = 74.56 eV) which enables charge-transfer-driven binding with both favourable ΔG (-39.500 kcal mol-1) and high experimental capacity (833.33 mg g-1). FT-IR spectroscopic analysis of the MOFs post-adsorption revealed the presence of the herbicide. The study's findings indicated that the prepared MOFs are effective adsorbent for removal of 2,4-dichlorophenoxyacetic acid from wastewater.

A copper(ii) metal-organic framework (MOF) formulated as [Cu4(NITA)4(H2O)2(DMF)4]·(DMF)4 was prepared and characterized by single-crystal X-ray crystallography. The compound crystallized as a paddled wheel binuclear complex with each copper(ii) ion in a distorted square pyramidal geometry. The MOF was reacted with silver indium sulphide (AgInS2) ternary quantum dots (TQDs), prepared using a hydrothermal technique, to construct a composite electrochemical sensor, formulated as {AgInS2@[Cu4(NITA)4(H2O)2(DMF)4]·(DMF)4} with improved electrochemical performance. The composite was characterized by electron microscopy and spectroscopic techniques and used to fabricate modified gold electrodes as electrochemical sensors for bisphenol A determination. Cyclic voltammetry (CV) and differential pulse voltammetry (DPV) were used for the determination of bisphenol A (BPA) at the surface of each of the modified gold electrodes. The composite-modified gold electrode performed better electrochemically than the MOFs and TQDs over a concentration range of 2-20 nM (S/N = 3). The process at the surface of the composite-modified electrode was found to be diffusion-controlled, with a limit of detection of 1.33 nM and a limit of quantitation of 4.03 nM. The composite-modified gold electrode was stable, reproducible and selective and could serve as a model for the development of electrochemical sensor to determine BPA in water sample from the environment.

Biochar-capped iron oxide nanoparticle functionalized with 3-aminopropyl triethoxysilane (APTES) was synthesized and used as photocatalysts for the degradation of malachite green (MG) and trypan blue (TPB) dyes. Powder X-ray diffraction patterns confirmed the crystalline cubic spinel structure of Fe3O4. HRTEM image shows nanocomposites with an average particle size of 22.4 nm, interplanar spacings of 0.297 nm and 0.245 nm, which correspond to the (220) and (222) planes of Fe3O4. SAED patterns indicate that Fe3O4@BC/APTES nanocomposite is polycrystalline. The energy bandgap of the biochar-capped iron oxide nanoparticles was reduced from 3.47 to 2.85 eV after functionalization with APTES. Photocatalytic degradation potential of the nanocomposite was evaluated with malachite green (MG) and trypan blue (TPB) dyes using the response surface methodology based on the Box-Behnken design (RSM-BDD). The optimal degradation efficiency from RSM-BBD for MG was 99.94% with a catalyst dosage of 7.5 mg, dye concentration of 50 ppm, and pH of 9 for 105 min. The optimum parameters for TPB were found to be a concentration of 30 ppm, a catalyst dosage of 12 mg, a pH of 5, and 85.77% of degradation after 90 min. Reusability studies show that the nanocomposite can be reused five times without significant reduction in the photocatalytic degradation efficiency.

Synthetic dyes widely used in textile are continuously being discharged into water sources and constitute significant hazard to the environment and human health. This study reports the synthesis, characterization, and photocatalytic performance of iron oxide nanocomposites using biochar carbonized at different temperatures for efficient degradation of malachite green (MG) and rhodamine B (RhB) dyes. Portulacaria afra leaves were carbonized at 200℃ to prepare Fe3O4@BC–1, at 400℃ to prepare Fe3O4@BC–2, and at 600℃ to prepare Fe3O4@BC–3 iron oxide nanocomposites. Powder X-ray diffraction analysis revealed a cubic Fe3O4 crystalline phase of iron oxide regardless of the carbonization temperature of the biochar. HRTEM images showed different morphologies with average particle sizes of 11.2–13.3 nm. Energy band gaps of 1.85 eV (Fe3O4@BC–1), 1.79 eV (Fe3O4@BC–2), and 1.97 eV (Fe3O4@BC–3) were obtained from the Tauc plot. The as-prepared iron oxide nanocomposites were used as photocatalysts for the degradation of malachite green (MG), rhodamine B (RhB), and their binary mixture under visible light irradiation. Fe3O4@BC-2 exhibited the highest photocatalytic degradation efficiencies of 99.74

A modified gold electrode with metal‐organic frameworks (MOFs), quantum dots (QTs) and their composite are fabricated to determine bisphenol A. The chemically modified sensors are characterized using ultraviolet‐visible, Fourier transform infrared spectroscopy spectra, X‐ray diffraction, scanning electron microscopy, and ransmission electron microscopy. Upon examining the electrochemical characteristics of the fabricated sensors, it is discovered that the QDs@MOFs conjugate performs better than the metal‐organic frameworks and quantum dots, which could be attributed to the better conductivity of the conjugate. The effects of pH, accumulation time, and sensor concentration are studied at optimal condition. Over a wide range of bisphenol A (BPA) concentrations (1 μM–14 μM), the limit of detection is found to be 0.470 μM and the limit of quantitation is 1.425 μM. The results indicate that the electrochemical sensor fabricated from composite modified gold electrode is efficient for the detection of bisphenol A. The stability and reproducibility of the sensor are also evaluated.

N,N-dibenzyl dithiocarbamate silver(I) was synthesized and characterized by spectroscopic techniques and single crystal X-ray crystallography. The complex crystallizes in the trigonal space group P31 to form a one-dimensional, chain-like polymeric structure connected by Ag-Ag argentophilic and Ag-S interactions. The complex was used as single source precursor and thermolyzed at 120, 160 and 200 degrees C in 1-dodecanethiol to prepare silver sulfide nanoparticles (AgS-120, AgS-160 and AgS-200). TEM images showed quasi-spherical nanoparticles with average particle sizes of 4.0, 5.4 and 5.5 nm for nanoparticles prepared at 120, 160 and 200 degrees C, respectively, with optical band gaps of 3.76, 3.81 and 3.71 eV. The as-prepared silver sulfide nanoparticles potential as photocatalysts were evaluated using rhodamine 6G and trypan blue under irradiation. The photocatalytic degradation efficiency of 42.4% (k = 3.03 x 10(-3)), 41.9% (k = 2.73 x 10(-3)) and 56.7% (k = 4.16 x 10(-3)) for rhodamine 6G dye and 35.4% (2.94 x 10(-3)), 49.7% (3.87 x 10(-3)) and 16.9% (9.0 x 10(-4)) for trypan blue dye were obtained in the presence of AgS-120, AgS-160 and AgS-200, respectively. The kinetics and mechanism of photocatalytic reaction show that the dye degradation in the presence of the as-prepared nanoparticles follow pseudo-first order kinetics.

Abstract Ternary quantum dot metal organic framework (MOFs) composite sensor formulated as (ZnInSe2@[Cu(2‐HNA)2(H2O)]) with an enhanced electrochemical performance was synthesized from a copper(II) metal‐organic framework complex ([Cu(2‐HNA)2(H2O)]) and ZnInSe2 ternary quantum dot (TQDs). The compounds were characterized by Fourier transform infrared spectroscopy, Ultraviolet‐Visible spectroscopy, transmission electron microscopy, scanning electron microscopy, single crystal X‐ray crystallography, and photoluminescence. Molecular structure of the copper(II) complex revealed a distorted square pyramidal geometry with two molecules of 2‐hydroxy‐1‐naphthaldedyde at the basal planes as bidentate chelating ligands with a coordinated water molecule at the apical position. TEM micrographs revealed monodispersed composite with an average particle size of 3.2 nm. The composite and its precursors were used as ectrochemical sensor for the detection of bisphenol A, using cyclic voltammetry, differential pulse voltammetry, and electrochemical impedance spectroscopy. The composite modified on a gold electrode exhibited enhanced electrochemical performance in comparison to those of the MOFs and TQDs. The reaction process at the surface of the modified electrode with the composite is diffusion controlled with a limit of detection, and limit of quantitation of 4.70 nM and 14.26 nM over a concentration range of 10–50 nM (S/N=3). The gold modified composite electrode is stable and could serve as a model for the development of electrochemical sensor to determine BPA.