Gurpreet Kour

(Cu/NCNTs): a new high temperature technique to prepare a recyclable nanocatalyst for four component pyridine derivative synthesis and nitroarenes reduction

N-Doped carbon nanotubes (NCNTs), which are further decorated with copper nanoparticles, have been prepared using a novel approach to the pre-existing methods. Their properties and characteristics have been studied using different techniques including UV-vis, XPS, TGA, ICP-AES, VSM, CHN, XRD, SEM-EDAX and TEM analysis. The Cu/NCNTs show nanocatalytic activity for the synthesis of four component pyridine derivatives and selective reduction of nitroarenes to their corresponding amines at ambient temperature conditions. 1H NMR and 13C NMR were employed to confirm the products of the synthetic transformations. We also report a new pyridine derivative, ethyl 6-(4,6-diamino-1,3,5-triazin-2-yl amino)-5-cyano-2-methyl-4-phenylpyridine-3-carboxylate (5j), via the use of melamine as the nitrogen source in the pyridine synthesis.

Studies of an Intermolecular Hydrogen-Bonded Complex of Butyloxy Benzoic Acid and Dipyridyl Ethylene

A symmetric hydrogen-bonded liquid crystalline complex was synthesized from 4-n-butyloxy benzoic acid and 1,2-di-(4-pyridyl)-ethylene. The complex was analyzed by optical polarizing microscopy, differential scanning calorimetery, and thermal gravimetric analysis. The existence of hydrogen-bonding for the complex was confirmed by Fourier transform infrared spectroscopy and x-ray crystallography. The liquid crystalline complex crystallizes with a triclinic space group P1with the parameters a = 7.3331(4) Å, b = 9.0701(4) Å, c = 11.6957(5) Å and α = 81.896(4)°, β = 79.239(4)°, and γ = 85.652(4)°.

Synthesis and Characterization of the Adducts of Bis(O-ethyldithiocarbonato)copper(II) with Substituted Pyridines

Monomeric five coordinated adducts of bis(O-ethyldithiocarbonato)copper(II) of general formula [Cu(C2H5OCS2)2(L)], [L = 2-, 3-, 4-methylpyridines and 2-, 3-, 4-ethylpyridines] have been synthesized and characterized by elemental analysis, i.r. and electronic spectroscopy, magnetic and conductivity measurements. Analytical results show that the adducts have 1 : 1 stoichiometry. The adducts were found to be paramagnetic and their magnetic moments at room temperature lie within the 1.81–1.94 B.M. range and this indicates the presence of one unpaired electron. All the adducts have distorted square pyramidal geometry.

Karyology of four Indian snakes

Abstract Cytogenetic studies were carried out on four species of Indian snakes viz Eryx conicus (Family Boidae), Naja naja naja (Family Elapidae), Vipera russelli and Echis carinatus (Family Viperidae) collected from Jammu region (J&K). Both E. conicus and N. n. naja show deviation from typical ophidian karyotype (2n=36), having 2n=34 (16 macro- and 18 microchromosomes, NF=42) in E. conicus and 2n=38 (16 macro- and 22 microchromosomes and NF=50) in N. n. naja. In both the species sex chromosomes are undifferentiated. V. russelli and E. carinatus exhibited typical ophidian karyotype viz 2n=36 (16 macro- and 20 microchromosomes) with NF=48 and 50 respectively. They possess a well differentiated ‘ZW’ sex mechanism in female, where ‘W’ is smaller and submetacentric, a final step in the evolution of sex chromosome in snakes and ‘Z’ is larger and metacentric.