Publications

Carbon nitride dots can serve as an effective stabilizing agent for reduced graphene oxide and help in subsequent assembly with glucose oxidase into hybrids for glucose detection application

Nanosheets-nanorods transformation during the non-isothermal decomposition of gadolinium acetate

2-[(2-Chlorobenzylidene)amino]-4,5,6,7-tetrahydro-1-benzothiophene-3-carbonitrile

In the title compound, C(16)H(13)ClN(2)S, the mean planes fitted through all non-H atoms of the heterocyclic five-membered and the benzene rings are oriented at a dihedral angle of 5.19 (7)°. In the crystal, a weak C-H⋯π inter-action occurs, along with weak π-π inter-actions [cenroid-centroid distance = 3.7698 (11) Å].

Co(OH)₂ Nanoparticle‐Encapsulating Conductive Nanowires Array: Room‐Temperature Electrochemical Preparation for High‐Performance Water Oxidation Electrocatalysis

It is highly desired but still remains challenging to design and develop a Co-based nanoparticle-encapsulated conductive nanoarray at room temperature for high-performance water oxidation electrocatalysis. Here, it is reported that room-temperature anodization of a Co(TCNQ)₂ (TCNQ = tetracyanoquinodimethane) nanowire array on copper foam at alkaline pH leads to in situ electrochemcial oxidation of TCNQ^- into water-insoluable TCNQ nanoarray embedding Co(OH)₂ nanoparticles. Such Co(OH)₂ -TCNQ/CF shows superior catalytic activity for water oxidation and demands only a low overpotential of 276 mV to drive a geometrical current density of 25 mA cm^-2 in 1.0 m KOH. Notably, it also demonstrates strong long-term electrochemical durability with its activity being retrained for at least 25 h, a high turnover frequency of 0.97 s^-1 at an overpotential of 450 mV and 100% Faradic efficiency. This study provides an exciting new method for the rational design and development of a conductive TCNQ-based nanoarray as an interesting 3D material for advanced electrochemical applications.

Nano-engineered Adsorbent for the Removal of Dyes from Water: A Review

Background: The huge quantity of wastewater, containing poisonous and hazardous dyes, is released by various industries which pollute water in direct and indirect ways. Most of the dyes are a dangerous class of water contaminants which have affected the environment drastically. Some dyes such as congo red, rhodamine B, methylene blue, methyl violet, and crystal violet are a serious threat to human beings. Remediation Method: Numerous methods are available for the removal of dyes from water. Adsorption, being a superior and eco-friendly technique, has advantage of eliminating organic dyes because of the availability of materials as adsorbents. The inexpensive nanomaterials are a more attractive choice for remediation of various dyes due to their unique properties and offer an adequate pathway to adsorb any organic dye from water to overcome its hazardous effects on human health. Results: In this review, we have discussed the latest literature related to various types of synthesis, characterization and uses as adsorbent for highly adsorptive removal capacity of nanoparticles for organic dyes. Conclusion: Adsorption technology provides an attractive pathway for further research and improvement in more efficient nanoparticles, with higher adsorption capacity, for numerous dyes to eliminate the dyes discharged from various industries and thus reduce the contamination of water. Therefore, nanocomposites may contribute to future prospective water treatment process.

A novel pH sensitive water soluble fluorescent nanomicellar sensor for potential biomedical applications

CCDC 792445: 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.

Can Gap Tuning Schemes of Long-Range Corrected Hybrid Functionals Improve the Description of Hyperpolarizabilities?

Long-range corrected hybrid density functionals (LC-DFT), with range separation parameters optimally tuned to obey Koopmans' theorem, are used to calculate the first-order hyperpolarizabilities of prototypical charge-transfer compounds p-nitroaniline (PNA) and dimethylamino nitrostilbene (DANS) in the gas phase and various solvents. It is shown that LC-DFT methods with default range separation parameters tend to underestimate hyperpolarizabilities (most notably in solution) and that the tuning scheme can sharply improve results, especially in the cases when the standard LC-DFT errors are largest. Nonetheless, we also identify pathological cases (two pyrrole derivatives) for which LC-DFT underestimates the hyperpolarizabilities, regardless of tuning. It is noted that such pathological cases do not follow the usual inverse relation between the hyperpolarizability and amount of exact exchange, and thus this behavior may serve as a diagnostic tool for the adequacy of LC-DFT.

Sensitive detection of Penicillin-G chemical using SnO2.YbO nanomaterials by electrochemical approach

In this approach, binary tin oxide doped ytterbium oxide nanosheets (SnO2.YbO NSs) were synthesized in an alkaline phase using under low-temperature facile hydrothermal technique. Traditional methods such as UV–Visible spectroscopy, Fourier Transform Infra-Red Spectroscopy (FTIR), Powder X-ray diffraction (XRD), Field Emission Scanning Microscopy (FESEM) equipped with X-ray electron dispersive spectroscopy (XEDS), and X-ray photoelectron spectroscopy (XPS) were used to fully characterize the prepared SnO2.YbO NSs. Fabrication of a thin-coating with doped NSs onto GCE by using 5% nafion conducting binder resulted in development of a selective and enzyme-free penicillin-G sensor probe. A reliable I-V technique was used to perform electrochemical performances of good sensitivity, large LDR, and long-term stability of the desired Penicillin-G sensor (SnO2.YbO NSs/GCE/Nf). With a wide range of Penicillin-G concentration, the proposed calibration plot is noticed good linearity (R2 = 0.9830). Sensitivity and LOD of the sensor were calculated as 24.75 μAμM-1cm−2 and 30.0 pM, respectively based on S/N = 3 formula. Real samples (Human and rabbit serum, milk, and red-sea water) were analyzed with the fabricated SnO2.YbO NSs/GCE/Nf sensor probe and the findings results were acceptable and satisfactory. This approach could be a noble development of in-situ Penicillin-G sensor based on binary SnO2.YbO NSs/GCE/Nf by reliable I-V technique for important sensing applications including beneficial doped nanomaterials and nano-technological system.

A porous Ni₃N nanosheet array as a high-performance non-noble-metal catalyst for urea-assisted electrochemical hydrogen production

The porous Ni₃N NA/CC acts as a high-performance and durable electrocatalyst for urea oxidation needing a potential of 1.35 V to drive 10 mA cm⁻² water-splitting current in 1.0 M KOH with 0.33 M urea.

Kinetics and Mechanistic Investigation of Decarboxylation for the Oxidation of Levofloxacin by Chloroamine-T in Acidic Medium

The mechanistic investigation of oxidation of levofloxacin (LF) has been studied by chloramine-T(CAT) in aqueous perchloric acid medium at 25 °C. The reaction followed first-order kinetics with respect to [CAT], [LF], and [H+] in their lower concentrations range, tending to zero-order at their higher concentrations. First-order kinetics with respect to [CAT] was observed for the oxidation of levofloxacin. An increase in perchloric acid concentration increased the rate of reaction. The effect of added products, ionic strength, and dielectric constant of the medium was studied on the rate of reaction. The main products were identified by spot test, FT-IR, and NMR. A mechanism was proposed on the basis of experimental results. The activation parameters with respect to the slow step of the mechanism was evaluated, and the thermodynamic parameters were also determined and discussed.

3,4-Dimethyl-<i>N</i>-(2,4,5-trimethoxybenzylidene)-1,2-isoxazol-5-amine

In the title compound, C(15)H(18)N(2)O(4), the aromatic rings on the azomethine double bond are trans to each other [C-C=N-C torsion angle = -178.29 (12)°] and they are approximately coplanar, the dihedral angle between them being 5.0 (1)°.

Effect of Neutral Polymer on Critical Micelle Concentration of Cationic Gemini Surfactants in Aqueous Solutions

Abstract The interaction between three PEGs (polyethylene glycol) and gemini surfactants in aqueous solution has been studied using conductometry. The surfactants studied were dicationic dibromide gemini surfactants with different methylene spacer length, 16-s-16, where s = 4 to 6 methylene groups. The critical aggregation concentration (CAC), and critical micelle concentration concentration (CMC) were derived from conductometric titration curves. The thermodynamic parameters were evaluated where ΔGmic, ΔGagg, and ΔGtrans are found to be negative, confirming the feasibility of interaction. Keywords: Critical aggregation concentrationcritical micelle concentrationgemini surfactantpolyethylene glycol

CCDC 845361: 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.

ChemInform Abstract: Recent Progress in Cobalt‐Based Heterogeneous Catalysts for Electrochemical Water Splitting

Abstract Review: 124 refs.

Synthesis, structures, DNA-binding, cytotoxicity and molecular docking of CuBr(PPh3)(diimine)

NSAID Conjugates with Carnosine and Amino Acids

Benzotriazole-mediated syntheses of novel bioconjugates of nonsteroidal anti-inflammatory drugs with carnosine and with amino acids were prepared in yields of 50–97% as potential drug candidates.

CCDC 852134: 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.