Copper(II) complexes of C-meso-1,5,8,12-tetramethyl-1,4,8,11-tetraazacyclotetradecane: syntheses, structures and properties †>
作者:Tian-Huey Lu、Shih-Chi Lin、Halikhedkar Aneetha、Kaliyamoorthy Panneerselvam、Chung-Sun Chung
DOI:10.1039/a905079e
日期:——
octahedral geometry in all the complexes. In 1 one of the perchlorate groups is free while the other bridges two metal ions with two of its oxygen atoms thus forming a linear chain, while in 2 the axial positions are occupied by the nitrogen atoms of two azide groups. The complexes 3–6 are isomorphous. The electronic spectral and the redox properties of the complexes are discussed. The acid dissociation
合成并表征了一系列的C-内消旋-1,5,8,12-四甲基-1,4,8,11-四氮杂环十四烷L 1的铜(II)配合物。[CuL 1(ClO 4)] ClO 4 1的晶体结构显示大环配体处于不稳定的反式-II构型,而[CuL 1(N 3)2 ] 2和[CuL 1(H 2 O)2 ] X 2(X = NO 2 3,Cl 4,Br 5或I 6)表明大环配体处于稳定的反式-III配置。在所有络合物中,金属离子均呈四边形的八面体几何形状。在1中,一个高氯酸盐基团是自由的,而另一个在其中两个氧原子之间桥接两个金属离子,从而形成一个线性链,而在2中,轴向位置被两个叠氮化物基团的氮原子占据。配合物3–6是同构的。讨论了配合物的电子光谱和氧化还原性质。在HNO 3 -NaNO 3水溶液(I = 5.0 M)中,在25.0±0.1至45±0.1°C的温度范围内研究了1的酸解离动力学。配合物表现出对氢离子浓度的一阶依赖性,k