Copper(II) complexes of the isomeric tetraazamacrocyclic ligands 1,11- and 1,8-bis(2-pyridylmethyl)-1,4,8,11-tetraazacyclotetradecane and of the 1,4,8,11-tetraazacyclotetradecane-5,12-dione analogue at neutral and basic pH
作者:Andrés E. Goeta、Judith A. K. Howard、Davide Maffeo、Horst Puschmann、J. A. Gareth Williams、Dimitrii S. Yufit
DOI:10.1039/b000739k
日期:——
amino nitrogens of the macrocycle, the two pyridine nitrogens and one deprotonated amide nitrogen, forming a distorted trigonal bipyramid. The second has a 2∶1 metal:ligand stoichiometry and, in the unit cell, bridges two complexes of the first type. In contrast, crystallisation under basic conditions leads to a 1∶1 complex in which the two amides are deprotonated and the copper ion is bound within
已经实现了新的N,N′-二烷基化的四氮杂大环1,11-双(2-吡啶基甲基)-1,4,8,11-四氮杂环十四烷L 1的区域选择性合成。L 1及其异构体的铜(II)配合物配体 1,8-双(2-吡啶基甲基)-1,4,8,11-四氮杂环十四烷,L 2,已经被分离并确定了它们的晶体结构。的[CUL的结构2 ] 2+(CH 3 CO 2 - )2,揭示了平面Ñ 4由铜的配合大循环,采用trans- III配置,并带有吊坠吡啶 氮占据细长的轴向位置。相反,在[CUL 1 ] 2+(CLO 4 - )2,铜是由四个5-协调氮原子 的 大循环,它采用trans- I配置,并带有一个吊坠吡啶 氮,与 吡啶 氮在顶点。还制备了新的大环二氧四胺1,8-双(2-吡啶基甲基)-1,4,8,11-四氮杂环十四烷-5,12-二酮L 3。L 3与铜(II),高氯酸 在中性条件下已显示 X射线衍射分析包含两个不同的含铜离子的