Publications

Synthesis, structural, electrochemical, and spectroscopic studies of some (diimine)ruthenium nitrile complexes

The syntheses of cationic ruthenium(II) complexes [Ru(Me₂-bpy)(PPh₃)₂RRʹ][PF₆]_x {Me₂-bpy = 4,4ʹ-dimethyl-2,2ʹ-bipyridine, (<b>3</b>) R = Cl, Rʹ = N≡CMe, x = 1, (<b>4</b>) R = Cl, Rʹ = N≡CPh, x = 1, (<b>5</b>) R = Rʹ = N≡CMe, x = 2} and [Ru(Me₂-bpy)(<i>κ</i>²-dppf)RRʹ][PF₆]_x {dppf = 1,1ʹ-bis(diphenylphosphino)ferrocene, (<b>6</b>) R = Cl, Rʹ = N≡CMe, x = 1, (<b>7</b>) R = Cl, Rʹ = N≡CPh, x = 1, (<b>8</b>) R = Rʹ = N≡CMe, x = 2} are reported, together with their structural confirmation by NMR (³¹P, ¹H) and IR spectroscopy and elemental analysis, and, in the case of <i>trans</i>-[Ru(Me₂-bpy)(PPh₃)₂(N≡CCH₃)Cl][PF₆] (<b>3</b>), by X-ray crystallography. Electronic absorption and emission spectra of the complexes reveal that all complexes except <b>4</b> and <b>6</b> are emissive in the range 370–400 nm with <b>8</b> exhibiting an emission in the blue. Cyclic voltammetry studies of <b>3–8</b> show reversible or quasi-reversible redox processes at <i>ca.</i> 1 V, assigned to the Ru(II/III) couple.

MoP nanosheets supported on biomass-derived carbon flake: One-step facile preparation and application as a novel high-active electrocatalyst toward hydrogen evolution reaction

Synthesis of some new 2-oxo-1,4-disubstituted-1,2,5,6-tetrahydro-benzo[h]quinoline-3-carbonitriles and their biological evaluation as cytotoxic and antiviral agents

Functional Properties of Grapefruit Seed Extract Embedded Blend Membranes of Poly(vinyl alcohol)/Starch: Potential Application for Antiviral Activity in Food Safety to Fight Against COVID-19

CCDC 889919: Experimental Crystal Structure Determination

An entry from the Cambridge Structural Database, the world’s repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available from the CCDC and typically includes 3D coordinates, cell parameters, space group, experimental conditions and quality measures.

CCDC 726372: Experimental Crystal Structure Determination

An entry from the Cambridge Structural Database, the world’s repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available from the CCDC and typically includes 3D coordinates, cell parameters, space group, experimental conditions and quality measures.

Exploring Rapid Photocatalytic Degradation of Organic Pollutants with Porous CuO Nanosheets: Synthesis, Dye Removal, and Kinetic Studies at Room Temperature

In this work, we report the facile, environmentally friendly, room-temperature (RT) synthesis of porous CuO nanosheets and their application as a photocatalyst to degrade an organic pollutant/food dye using NaBH₄ as the reducing agent in an aqueous medium. Ultrahigh-resolution field effect scanning electron microscopy images of CuO displayed a broken nanosheet-like (a length of ∼160 nm, a width of ∼65 nm) morphology, and the lattice strain was estimated to be ∼1.24 × 10^-3 using the Williamson-Hall analysis of X-ray diffraction plots. Owing to the strong quantum size confinement effect, CuO nanosheets resulted in an optical energy band gap of ∼1.92 eV, measured using Tauc plots of the ultraviolet-visible (UV-vis) spectrum, resulting in excellent photocatalytic efficiency. The RT synthesized CuO catalyst showed a high Brunauer-Emmet-Teller surface area of 30.88 ± 0.2313 m²/g (a correlation coefficient of 0.99972) with an average Barrett-Joyner-Halenda pore size of ∼20.385 nm. The obtained porous CuO nanosheets exhibited a high crystallinity of 73.5% with a crystallite size of ∼12 nm and was applied as an efficient photocatalyst for degradation of the organic pollutant/food dye, Allura Red AC (AR) dye, as monitored by UV-vis spectrophotometric analysis and evidenced by a color change from red to colorless. From UV-vis spectra, CuO nanosheets exhibited an efficient and ultrafast photocatalytic degradation efficiency of ∼96.99% for the AR dye in an aqueous medium within 6 min at RT. According to the Langmuir-Hinshelwood model, photodegradation reaction kinetics followed a pseudo-first-order reaction with a rate constant of <i>k</i> = 0.524 min^-1 and a half-life (<i>t</i> _1/2) of 2.5 min for AR dye degradation in the aqueous medium. The CuO nanosheets showed an outstanding recycling ability for AR degradation and would be highly favorable and an efficient catalyst due to the synergistic effect of high adsorption capability and photodegradation of the food dye.

Zn(II) and Cu(II) tetrakis(diarylamine)phthalocyanines as hole-transporting materials for perovskite solar cells

Finding new hole-transporting materials (HTMs) suitable for replacing the state-of-the-art spiro-OMeTAD is still challenging. In this work, newly synthesized diarylamine-substituted metal phthalocyanines (MPcs, M = Zn(II) or Cu(II)) functionalized with either linear or branched alkoxy chains are evaluated as HTMs in perovskite solar cells. Both the nature of the alkoxy chains and that of the coordinated metal species were found to influence the functional properties of the new MPcs. In particular, devices based on a ZnPc featuring four n-butoxy side chains exhibited the highest power conversion efficiencies (PCEs). A PCE of 20.00% was reached for triple cation perovskite devices, and a PCE up to 20.18% could be achieved for double cation devices.

4-{2-[(<i>E</i>)-Cyclopentylidene]hydrazin-1-yl}benzenesulfonamide

The title mol-ecule, C(11)H(15)N(3)O(2)S, features a five-membered ring which is twisted about the middle CH(2)-CH(2) bond. The benzene ring is inclined with respect to the imine residue [C-N-N-C torsion angle = 165.4 (2)°]. Supra-molecular layers in the bc plane are formed by hydrogen bonds between the amine H atoms and sulfonamide O and imine N atoms, as well as by a weak hydrazine H-atom inter-molecular inter-action with the second sulfonamide O atom.

New Conjugated Systems Derived from Piperazine-2,5-dione

The preparation of monoarylidene and both symmetrical and unsymmetrical bisarylidene derivatives of piperazine-2,5-dione is described. The use of 1,4-diacetylpiperazine-2,5-dione make it possible to prepare unsymmetrical bisarylidenes. The introduction of a dicyanomethylene moiety into the para position of one of the arylidene groups gave a remarkable deepening in the colour of the resulting compounds 11 and 16.

CCDC 981086: Experimental Crystal Structure Determination

An entry from the Cambridge Structural Database, the world’s repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available from the CCDC and typically includes 3D coordinates, cell parameters, space group, experimental conditions and quality measures.

Synthesis, characterization and optical properties of mono- and bis-chalcone

Synthesis, Crystal Structures and Cytotoxic Activity of New 1,3,4,5-tetrahydro-2H-1,5-benzodiazepine Derivatives

The synthesis of a series of 1,3,4,5-tetrahydro-2H-1,5-benzodiazepine has been achieved by reaction of DHA (dehydroacetic acid), o-PDA (o-phenylenediamine) and aromatic aldehydes in the presence of a catalytic amount of TFA (trifluoroacetic acid). Four molecules were crystallised and their structures determined using single crystal X-ray crystallography The 15-benzodiazepines derivatives were evaluated for their in vitro cytotoxic effects.

A Study Assessing the Quality of Life After Bariatric Surgery in Obese Patients: Review Article

Obesity has emerged as a pandemic and a serious public health issue due to its high prevalence and detrimental effects on mortality, morbidity, healthcare costs, and quality of life [QoL]. According to estimates &nbsp;by 2030 over one billion people worldwide will suffer from obesity, affecting one in five women and one in seven men. On the other hand Bariatric surgery, also known as weight-loss surgery, refers to a group of surgical procedures designed to aid individuals with obesity in achieving weight loss. The study aim to assess the quality&nbsp; of&nbsp; life&nbsp; after bariatric surgery in obese patients METHODS: Research Studies assessing the quality of life (QoL) of patients who underwent bariatric surgery using various questionnaires, including the Short Form-36 and the Modified-Ardelt Quality of Life Questionnaire II (M-AQoLQII). Additionally, the Bariatric Analysis and Reporting Outcome System (BAROS) scores were included.regardless of sub-type of bariatric surgery RESULTS: Fourteen studies on bariatric surgery's impact on quality of life (QoL) were analyzed. A cross-sectional study of 887 patients found significant QoL and BMI improvements post-surgery. Another study of 2,132 patients showed improved QoL, weight, and comorbidities. The Bariatric Analysis and Reporting Outcome System (BAROS) scores indicated good to very good outcomes up to 10 years post-surgery. Bariatric surgery effectively improves QoL, weight, and health outcomes in obese&nbsp;individuals. CONCLUSION: Bariatric surgery significantly improves quality of life (QoL) and health outcomes for severely obese individuals. The study advocates for increased access to bariatric procedures in public healthcare. Obese individuals who underwent surgery showed substantial improvements in physical health and daily activities. Factors like age, gender, occupation, and BMI level influenced QoL. The study concludes that bariatric surgery provides long-term QoL improvements, making it a recommended treatment for severe obesity and metabolic&nbsp;syndrome.

1-(2,5-Dimethyl-3-thienyl)-3-(2,4,5-trimethoxyphenyl)prop-2-en-1-one

The title compound, 1-(2,5-dimethyl-3-thienyl)-3-(2,4,5-trimethoxy­phenyl)prop-2-en-1-one (3) was synthesized in high yield by an aldol condensation reaction of 3-acetyl-2,5-dimethythiophene and 2,4,5-trimethoxybenzaldehyde in methanolic NaOH at room temperature. Its structure was fully characterized by elemental analysis, IR, 1H NMR, 13C NMR and EI-MS spectral data.

Honeycomb Carbon Nanofibers: A Superhydrophilic O₂‐Entrapping Electrocatalyst Enables Ultrahigh Mass Activity for the Two‐Electron Oxygen Reduction Reaction

Abstract Electrocatalytic two‐electron oxygen reduction has emerged as a promising alternative to the energy‐ and waste‐intensive anthraquinone process for distributed H 2 O 2 production. This process, however, suffers from strong competition from the four‐electron pathway leading to low H 2 O 2 selectivity. Herein, we report using a superhydrophilic O 2 ‐entrapping electrocatalyst to enable superb two‐electron oxygen reduction electrocatalysis. The honeycomb carbon nanofibers (HCNFs) are robust and capable of achieving a high H 2 O 2 selectivity of 97.3 %, much higher than that of its solid carbon nanofiber counterpart. Impressively, this catalyst achieves an ultrahigh mass activity of up to 220 A g −1 , surpassing all other catalysts for two‐electron oxygen reduction reaction. The superhydrophilic porous carbon skeleton with rich oxygenated functional groups facilitates efficient electron transfer and better wetting of the catalyst by the electrolyte, and the interconnected cavities allow for more effective entrapping of the gas bubbles. The catalytic mechanism is further revealed by in situ Raman analysis and density functional theory calculations.

Carbon Nanotubes-Silicon Nanocomposites Based Resistive Temperature Sensors

This work presents the fabrication and temperature sensing properties of the carbon nanotubes-silicon (CNT-Si) nanocomposites based sensors. The multi-walled carbon nanotubes used for the fabrication of sensors have diameter in the range of 10-30, while the silicon powder (1.99 μm) is obtained by the milling of p-Si crystal wafers containing impurity (boron) concentration of 1016 cm–3. For the synthesis of nanocomposites the silicone adhesive (Hero Gum) and organic polymer (GMSA) are used as an binding materials. Four different types of composites are prepared for the fabrication of sensors. Film deposition is carried out by using drop casting and doctor blade technology. In all the sensors entire thickness of composite film is equal to 100 μm. The temperature sensitivity is found in the range of 0.53 %/ °C to -0.74 %/°C. Depending on composition, ratio of components and kind of adhesive materials the initial resistance values of the sensors are in the range of 260 Ω to 34 kΩ. The simulation of experimental results is carried out by using exponential function and the simulated results are in good agreement with the experimental results.

Homologous Catalysts Based on Fe‐Doped CoP Nanoarrays for High‐Performance Full Water Splitting under Benign Conditions

The design and development of earth-abundant electrocatalysts for efficient full water splitting under mild conditions are highly desired, yet remain a challenging task. A homologous Fe-doped Co-based nanoarray incorporating complementary catalysts is shown to effect high-performance and durable water splitting in near-neutral media. Iron-doped cobalt phosphate borate nanoarray on carbon cloth (Fe-Co-Pi-Bi/CC) derived from iron-doped cobalt phosphide on CC (Fe-CoP/CC) through oxidative polarization behaves as a highly active bimetallic electrocatalyst for water oxidation with an overpotential of 382 mV to afford a catalytic current density of 10 mA cm^-2 in 0.1 m potassium borate (K-Bi, pH 9.2). Fe-CoP/CC is also highly active for the hydrogen evolution reaction, capable of driving 10 mA cm^-2 at an overpotential of only 175 mV in 0.1 m K-Bi. A two-electrode water electrolyzer incorporating Fe-Co-Pi-Bi/CC as anode and Fe-CoP/CC as cathode achieves 10 mA cm^-2 water-splitting current at a cell voltage of 1.95 V with strong long-term electrochemical durability.