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

• Published in: Inorganic chemistry communications 2013-04, Vol.30, p.163-167
• Main Authors: Liu, Bin, Zhang, Yu-Jiao, Yang, Bin-Sheng
• Format: Article
• Language: English
• Subjects: Apoovotransferrin; Chromium(III); Fluorescence; Kinetics; Salicylic acid
• ISSN: 1387-7003; 1879-0259
• DOI: 10.1016/j.inoche.2013.02.004

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. Cr(III) can transfer from TBA[Cr(SA)2(en)] (I) or [Cr(SA)(en)2]Br to apoOTf at a different rate. The releasing salicylate ligand will further be combined to OTf along with serious fluorescence quenching of salicylate. [Display omitted] ► Two salicylate Cr(III)complexes [Cr(SA)2(en)]TBA and [Cr(SA)(en)2]Br were prepared. ► Their kinetics difference with apoovotransferrin were compared. ► The releasing SA is combined to OTf with serious fluorescence quenching of salicylate.