Copper(II) complexes of Schiff bases derived from the condensation of two molecules of salicylaldehyde and methanediamine (L1) or some phenyl substituted methanediamines (L2âL5) have been synthesized and characterised. The crystal structure of the phenylmethanediamine (L2) derivative has been determined. The ligand acts as bis-bidentate, bridging two copper atoms which are co-ordinated to two phenolato and two imino groups of two ligands. Two binuclear moieties [Cu2(L2)2] are held together through CuâO(phenolato) interactions between adjacent units forming a pseudo-linear [Cu2L22]2 cluster. Variable temperature magnetic susceptibility data for this derivative reveal the presence of weak antiferromagnetic interactions (âJ â 2â3 cmâ1) between nearest neighbour spin centres. The structural factors that may be responsible for the sign and magnitude of the exchange interactions are discussed.
已经合成了由
水杨醛和甲二胺(L1)或某些苯基取代的甲二胺(
L2-L5)两个分子缩合而成的席夫碱
铜(II)配合物,并对其进行了表征。已经确定了苯基甲二胺(
L2)衍
生物的晶体结构。
配体作为双齿状
配体,连接两个
铜原子,
铜原子与两个
配体的两个
酚基和两个亚
氨基基团配位。两个双核部分[Cu2(
L2)2]通过相邻单元之间的Cu-O(
酚基)相互作用结合在一起,形成伪线性[Cu2
L22]2簇。该衍
生物的变温磁化率数据表明,最近的相邻自旋中心之间存在弱反
铁磁相互作用(△J≅2-3 cm△1)。讨论了可能影响交换相互作用符号和大小的结构性因素。