Metal Complexes with Macrocyclic Ligands. Part XLI. Nickel(II) and copper(II) complexes with mono-<i>N</i>-functionalized dithiadiazamacrocycles
作者:Esther Hörmann、Pascale C. Riesen、Markus Neuburger、Margareta Zehnder、Thomas A. Kaden
DOI:10.1002/hlca.19960790124
日期:1996.2.7
carrying an amino group as a pendant arm have been synthesized and their complexation properties towards Ni2+ and Cu2+ studied. The crystal structures of the Cu2+ complexes with 10-methyl-1,4-dithia-7,10-diazacyclododecane-7-ethanamine (3) and 11-methyl-1,4-dithia-8,11-diazacyclotetradecane-8-ethanamine (10) show that, in both cases, the Cu2+ is pentacoordinated by the four donor atoms of the macrocycle and
已经合成了三个带有氨基作为侧链的N 2 S 2大环(3、10、12 ),并研究了它们对Ni 2+和Cu 2+的络合特性。Cu 2+与10-甲基-1,4-二硫杂-7,10-二氮杂环十二烷-7-乙胺(3)和11-甲基-1,4-二硫杂-8,11-二氮杂环十四烷-8的晶体结构-乙胺(10)表明,在两种情况下,Cu 2+均被大环的四个供体原子和侧链的氨基五配位。但是,在水溶液中,两种形式的化学计量比为[MLH]和[ML]的配合物(M = Cu 2+或观察到Ni 2+)。在[MLH]中,氨基被质子化并且不与金属离子结合,而在[MLH]中,氨基被结合,形成五配位的几何形状。平衡[ML] + H + ⇌[MLH] +的p K a值以12> 10> 3的顺序降低,表明2-氨基乙基侧链比3-氨基丙基侧与Cu 2+的结合更好链。Cu 2+ / Cu +对的循环伏安法表明,当金属离子位于14元环(10)中时,2-氨基乙基侧链臂可稳定Cu