Binding of alkanesulfonates, CH3(CH2)nO2SO− (where n = 2–8) with hexaureachromium(III) in aqueous medium:synthesis, characterization and binding properties of [Cr(CO(NH2)2)6](CH3(CH2)nO2SO)3.xH2O

Abstract

New hexaureachromium(III) complexes with a homologue series of alkanesulfonates i.e., CH3(CH2)nO2SO− (where n = 2–8) have been synthesized in aqueous medium and characterized by spectroscopic techniques (IR and UV-Visible). The comparative thermal stability of these complexes has been studied by thermal gravimetric analysis (TGA). The binding property of the cation towards sulfonates has been studied using standard UV–vis spectroscopic titrations in aqueous medium. X-ray structured determination of compounds [Cr(CO(NH2)2)6](CH3(CH2)2O2SO)3 and [Cr(CO(NH2)2)6](CH3(CH2)3O2SO)3 revealed that both were crystallized in trigonal crystal system with R-3 space group having six molecules per unit cell. Further, antimicrobial activity of all the complexes along with sodium salts of alkanesulfonates has been tested using strain of Gram negative and strain of Gram positive bacteria (E. coli, K. pneumoniae, S. typhi and S. epidermidis, B. subtilis respectively). All complexes are only active against S. epidermidis and K. pneumoniae. This study envisages that complex 1–3 and 6 have more inhibitory activity as compared to the starting material and sodium salts of alkanesulfonates.