Development of a C3-symmetric benzohydroxamate tripod: Trimetallic complexation with Fe(III), Cr(III) and Al(III)
作者:Minati Baral、Amit Gupta、B.K. Kanungo
DOI:10.1016/j.saa.2016.02.033
日期:2016.6
reveals of interesting electronic transitions occurred during the complexation. BTHA exhibits a peak at 238 nm in acidic pH and with the increase of pH, a new peak appeared at 270 nm. A substantial shifting in both of the peaks in presence of the metal ions implicates a s coordination between ligand and metal ions. Moreover, complexation of BTHA with iron shows three distinct colors, violet, reddish orange
描述了C 3对称的苯-1,3,5-三羰基异羟肟酸酯三脚架(此处记为BTHA)的设计,合成和理化性质。螯合剂由苯作为锚固剂构建,并被三个异羟肟酸酯作为连接部分对称地延伸,每个均带有O,O供体位点。结合吸收分光光度法,电位法和理论研究来探索配体与某些三价金属离子(Fe(III),Cr(III)和Al(III))的络合行为。在高水介质(9:1 H 2)中,在2-11的pH范围内,为配体计算了三个质子化常数O:DMSO)。分子结构中的高刚性限制了1:1(M / L)金属包封的形成,但对于3:1金属配体化学计量显示出高的结合效率,从而形成了[[β单位]的形成常数(以β为单位),[ M 3 L];中号Fe(III),Al(III)和Cr(III),可被视为有效的铁载体。分光光度法研究揭示了在络合过程中发生了有趣的电子跃迁。BTHA在酸性pH值中在238 nm处出现一个峰,并且随着pH的增加,在270