Studies of pendant-arm macrocyclic ligands. Part 2. Comparison of the nickel(<scp>II</scp>), copper(<scp>II</scp>), and zinc(<scp>II</scp>) complexes of 11-(2′-dimethylaminoethyl)-1,4,7,11-tetra-azacyclotetradecane, a pyridine analogue, and a related new tetra-aza macrocycle, 11-methyl-1,4,7,11-tetra-azacyclotetradecane
作者:Nathaniel W. Alcock、Peter Moore、Colin Pierpoint
DOI:10.1039/dt9840002371
日期:——
observed. The complexes of formula [Zn(L)][NO3]2(L = L1 or L2) were found to be single isomers which do not isomerise even at elevated temperatures. 13C N.m.r. studies show that in [Zn(L1)][NO3]2 the macrocycle is asymmetric whereas in [Zn(L2)][NO3]2 the macrocycle is in a symmetric configuration. The new, related macrocycle, 11-methyl-1,4,7,11-tetra-azacyclotetradecane, L3, and its complexes with Ni2+
Ni 2 +,Cu 2+和Zn 2+与两个紧密相关的侧臂五氮杂大环11-(2'-二甲基氨基乙基)-1,4,7,11-四氮杂环十四烷L 1的配合物,和7-(2'-二甲基氨基乙基)-3,7,11,17-四氮杂双环[11.3.1] heptadeca-1(17),13,15-三烯L 2的光谱已表征。已经发现质子化的配体L 1 [Ni(HL 1)] [ClO 4 ] 3的正方形平面络合物先前在两种异构体的混合物中被发现在热水溶液中异构化,从而得到另外两种异构体。式[Ni(L 1)(NCS)] ClO的六坐标硫氰酸根络合物分离出4和[Ni(HL 1)(NCS) 2 ] ClO 4。对于配体(L 1)(但不是L 2)的质子化铜( II)配合物,[Cu(L 1)] 2+ + H + ⇌[Cu(HL 1)]类型的温度依赖性平衡3+存在于水溶液中,和可变温度可见光谱研究表明,在298.2 K, ķ =(2.2±0