Two novel Cr(III) complexes [Cr(SA)2(en)]TBA and [Cr(SA)(en)2]Br: Synthesis, characterization and spectral studies

摘要

In this paper, two types of salicylate Cr(III) complexes [Cr(SA)2(en)]TBA-H2O (I) and [Cr(SA)(en)2]Br·H2O (II) have been synthesized (TBA = Tetrabutylammonium, SA = salicylate, en = ethylenediamine) and determined by X-ray crystallography. Then competition reaction with ethylenediamine-N,N,N',N'-tetraacetic acid (EDTA) or apoovotransferrin (apoOTf) was monitored by UV-Visible and fluorescence spectra at 37 °C. It indicated that decomposition rate of k_(I) is smaller than k_(II). In the reaction with apoOTf, the releasing salicylate ligands will further be combined to OTf along with the serious fluorescence quenching of salicylate.