Preparation, Electronic Properties, and Powder-XRD Structure Analysis of 3,5-Bis(pyridin-2-yl)-H-1,2,4-triazoledichloridocopper(II)

Abstract

Salt of [Cu(bptrzH)Cl2], (bptrzH = 3,5-bis(pyridin-2-yl)-H-1,2,4-triazole) has been prepared and characterized its electronic spectral and magnetic properties. This salt is paramagnetic with magnetic moment, μs, being 1.77–1.78 BM at 293 K, but decreased significantly with decreasing temperature to be 0.60–0.63 BM at 90 K, indicating antiferromagnetic nature. This is associated with Cu–Cu magnetic interactions at low temperatures, and suggests that the salt adopt an octahedrally polymeric structure. The electronic spectrum of this salt reveals a strong ligand field band centered at about 13,000 cm–1 and a very strong charge transfer absorption at about 23,000–24,000 cm–1. The spectrum is better resolved at lower temperature and this is parallel to the slight change in color from yellowish-green at room temperature to bright green at low temperature (90 K). The powder XRD of this complex was refined by Le Bail method of Rietica program and found to be fit as triclinic symmetry of space group PĪ with the figure of merit: Rp = 5.02; Rwp = 7.95; Rexp = 5.40; Bragg R-Factor = 0.05; and GOF = 2.166.

Synthesis, Characterization and Antibacterial Activity Study of Cobalt(II), Nickel(II), Copper(II), Palladium(II), Cadmium(II) and Platinum(IV) Complexes with 4-Amino-5-(3,4,5-trimethoxyphenyl)-4<i>H</i>-1,2,4-triazole-3-thione

“…The electronic spectrum of C1 complex in DMSO solvent shown in Fig. 2, reveals two spin-allowed bands in the visible region at 656 nm and 557 nm, which might be related to the transition of 4 T 1 g → 4 A 2 g (F) (ν2) and 4 T 1 g → 4 T 1 g (P) (ν3) respectively. The bands' positions agree with the reported values for an octahedral geometry.…”

“…In addition, the triazolethione system is known as a cyclic analog of very significant components such as thiosemicarbazides and thiocarbohydrazides, which are widely distributed in many organic reactions as a reactive building block leading to deferential heterocyclic rings and successful biological applications. The nucleus of mercapto-1,2,4triazole is also present in many natural products and pharmaceuticals [4]. Those having 1,2,4-riazole thione-thiol derivatives have gained considerable importance in medicinal chemistry due to their anticancer [5], antimicrobial [6], antioxidant, antitumor, antituberculosis, anticonvulsant [7], fungicidal [8], antiepileptic, and anti-inflammatory activities [9].…”