R.M. Kumar

Luminescence and electrochemical properties of rare earth (Gd, Nd) doped V2O5 nanostructures synthesized by a non-aqueous sol–gel route

Vanadium pentoxide nanostructures have been obtained from an alkoxide sol–gel, prepared by a simple and inexpensive facile non-aqueous method. The progressive addition of rare earth (RE) ions (Gd3+, Nd3+) to pristine V2O5 and the structural, functional, morphological, optical and electrochemical properties were studied. XPS studies confirmed the presence of RE ions in the orthorhombic phase of pristine V2O5, which was supported by XRD. The doping of RE ions significantly altered the morphology of V2O5 into various nanostructures by the linkage of small V2O5 nanoparticles. A significant red shift from undoped V2O5 was observed from UV absorption and PL spectra. From the CV experiment, it was observed that the overall cell potential was increased for the doped samples. The specific capacity of the Gd3+ and Nd3+ doped V2O5 increased upto 10%, which is useful for secondary Li-ion rechargeable batteries.

Studies on Growth, Spectral, Thermal, Mechanical and Optical Properties of 4-Bromoanilinium 4-Methylbenzenesulfonate Crystal: A Third Order Nonlinear Optical Material

4-Bromoanilinium 4-methylbenzenesulfonate (4BPTS) single crystal was successfully grown from ethanol by slow evaporation method at room temperature. The structure of grown crystal was confirmed by single crystal X-ray diffraction studies. The presence of functional groups of grown crystal was confirmed by the Fourier transform infrared spectroscopy (FTIR) spectral analysis. UV-Visible absorption study was performed on the grown crystal to determine the cut-off wavelength. The thermal stability of the grown crystal was investigated from the Thermogravimetric analysis (TGA)/ Differential thermal analysis (DTA) analysis. The mechanical behaviour of grown crystal was studied by using Vickers microhardness test. The third order non-linear optical properties of 4BPTS were investigated by Z-scan technique with He-Ne laser radiation and the corresponding non-linear refractive index and absorption coefficients were also calculated.

Glycinium 3-carb­oxy-4-hy­droxy­benzene­sulfonate

In the anion of the title salt, C2H6NO2 +·C7H5O6S−, the dihedral angle between the carboxylic acid group and the benzene ring is 5.02 (12)°. In the crystal, the anions are linked into inversion dimers through pairs of O—H⋯O hydrogen bonds between the carboxylic acid groups and sulfonate O atoms. A pair of C—H⋯O interactions is also observed within each dimer. The anion dimers and the cations are linked into a three-dimensional network by N—H⋯O, O—H⋯O and C—H⋯O hydrogen bonds.

Crystal structure of piperidinium 4-nitro­phenolate

In the title salt, the piperidine ring of the cation adopts a chair conformation. In the crystal, N—H⋯O hydrogen bonds link adjacent anions and cations into infinite chains along [100]. The chains are linked by C—H⋯π interactions, forming sheets lying parallel to (001).

Benzotriazolium 4-methyl-benzene-sulfonate.

In the title molecular salt, C6H6N3 +·C7H7O3S−, the components are linked by N—H⋯O hydrogen bonds into zigzag chains along [100]. These chains are further connected by weak C—H⋯O, C—H⋯π and π–π (centroid-to-centroid distances = 3.510, 3.701 and 3.754 Å) interactions into a three-dimensional network.

Enhanced photocatalytic activity of CeO 2 @α-MoO 3 heterostructure

With a unique structure and extraordinary properties, CeO2 has attracted tremendous attention in the preparation of composites for various applications. In this study, novel CeO2@α-MoO3 nanocomposite with pellet like structure has been synthesized by in-situ hydrothermal method. The structure morphology, optical and thermal properties of CeO2@α-MoO3 nanocomposite was characterized by X-ray diffraction, scanning electron microscopy, energy dispersive X-ray analysis, field emission scanning electron microscopy, transmission electron microscopy, high-resolution transmission electron microscopy, atomic force microscopy, Fourier transform infrared spectroscopy, UV–visible spectroscopy (UV–vis), photoluminescence spectrometer and thermogravimetric analyses. Electron paramagnetic resonance spectroscopy was carried out to understand the valance state of the electrons. The photocatalytic activity of CeO2@α-MoO3 nanocomposite investigated with methylene blue dye shows strong degradation efficiency under UV–visible light irradiation compared to pure CeO2 and α-MoO3 nanoparticles. Our results indicate that CeO2@α-MoO3 nanocomposite is a promising composite material for application in photocatalysis.

Crystal structure of 2-phenyl-ethanaminium 3-carb-oxy-prop-2-enoate.

The title molecular salt, C8H12N+·C4H3O4 −, crystallized with two independent cations and anions in the asymmetric unit. The ethanaminium side chains of the cations exhibit anti conformations [C—C—C—N torsion angles = 176.5 (3) and −179.4 (3)°]. In the crystal, N—H⋯O and C—H⋯O hydrogen bonds connect adjacent anions and cations, and , O—H⋯O hydrogen bonds connect adjacent anions, generating sheets parallel to (001).

Crystal structure of 4-(di­methyl­amino)­pyridinium 4-amino­benzoate dihydrate

In the title hydrated molecular salt, C7H11N2 +·C7H6NO2 −·2H2O, the cation is protonated at the pyridine N atom and the dihedral angle between the benzene ring and the CO2 − group in the anion is 8.5 (2)°. In the crystal, the cation forms an N—H⋯O hydrogen bond to the anion and the anion forms two N—H⋯O hydrogen bonds to adjacent water molecules. Both water molecules form two O—H⋯O hydrogen bonds to carboxylate O atoms. In combination, these hydrogen bonds generate a three-dimensional network and two weak C—H⋯π interactions are also observed.

Crystal structure of 4-amino-benzoic acid-4-methyl-pyridine (1/1).

In the title 1:1 adduct, C6H7N·C7H7NO2, the carboxylic acid group is twisted at an angle of 4.32 (18)° with respect to the attached benzene ring. In the crystal, the carboxylic acid group is linked to the pyridine ring by an O—H⋯N hydrogen bond, forming a dimer. The dimers are linked by N—H⋯O hydrogen bonds, generating (010) sheets.

Crystal structure of 4-bromo-anilinium 4-methyl-benzene-sulfonate.

In the crystal of the title molecular salt, C6H7BrN+·C7H7O3S−, the anions and cations are linked via N—H⋯O hydrogen bonds forming layers, enclosing R 2 2(4) ring motifs, lying parallel to (001). Within the layers there are short O⋯O contacts of 2.843 (2) Å.