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

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.