Chromotropism in halo-bridged dimers. Structural characterization of bis(μ-halo)bis(halo N-(pyridin-2-ylmethyl)cyclohexanamine copper(II))
作者:Hamid Golchoubian、Samira Nateghi
DOI:10.1080/00958972.2016.1227972
日期:2016.11.1
position of the copper(II) being occupied by the bridging chloride anion which is equatorial to the other copper ion, forming a dimeric copper(II) complex. The chromotropic properties of both complexes, including solvato-, thermo-, and halochromism, were investigated. The complexes show reversible thermochromism in solution which is irreversible in the solid state. It was found that the solvatochromism is
摘要 两种双核铜 (II) 配合物 [LCu(μ-Cl)Cl]2 (DMF) (1) 和 [LCu(μ-Br)Br]2 (2),具有双齿配体 N-(pyridin-2)合成了-基甲基)环己胺,L,并通过物理化学和光谱(IR,UV-vis)数据进行表征。1 的晶体结构分析表明,两个铜 (II) 离子都处于扭曲的四角锥 N2Cl3 环境中,铜 (II) 的顶端位置被与另一个铜离子赤道的桥接氯阴离子占据,形成一个二聚铜(II)配合物。研究了这两种配合物的变色特性,包括溶剂化、热和卤化变色。该配合物在溶液中表现出可逆的热致变色现象,而在固态时则不可逆。发现溶剂化显色是由于结构变化以及配合物空位的溶剂化所致。通过可见吸收光谱在 1-11 的 pH 范围内研究了它们的卤致变色特性。颜色从蓝色变为绿色并变为无色是由于配体的去质子化和质子化。