Zinc and cadmium complexes of an 18-membered N4O2 oxaaza-Schiff base macrocycle and the corresponding reduced form †
作者:Harry Adams、Rufina Bastida、David E. Fenton、Alejandro Macías、Sharon E. Spey、Laura Valencia
DOI:10.1039/a906372b
日期:——
The metal templated (Cd and Zn) cyclocondensation of 2,6-pyridinedicarbaldehyde and 1,5-bis(2-aminophenoxy)-3-azapentane is reported together with the crystal structures of two mononuclear cadmium macrocyclic Schiff base complexes, [CdL1(NO3)2] 1 and [CdL1(H2O)2][ClO4]2 2 and a dinuclear, µ-hydroxy-bridged zinc macrocyclic Schiff base complex [Zn2L12(OH)][ClO4]3·CH3CN 3·CH3CN. The corresponding reduced macrocycle, L2, has been synthesised by using the MnII-templated cyclocondensation of 2,6-pyridinedicarbaldehyde and 1,5-bis(2-aminophenoxy)-3-azapentane in methanol followed by an in situ reductive demetallation of the Schiff base macrocyclic manganese(II) complex using excess sodium borohydride. The crystal structures of the free macrocycle L2, [CdL2(NO3)2] 4 and [CdL2(CH3CN)2][ClO4]2 5 are reported.
报告了 2,6-吡啶二甲醛和 1,5-双(2-氨基苯氧基)-3-氮杂戊烷的金属模板(镉和锌)环缩合反应,以及两个单核镉大环希夫碱配合物的晶体结构、[CdL1(NO3)2]1和[CdL1(H2O)2][ClO4]2 2以及双核、µ-羟基桥接的锌大环席夫碱配合物[Zn2L12(OH)][ClO4]3Â-CH3CN 3Â-CH3CN的晶体结构。相应的还原大环 L2 是通过锰Ⅱ在甲醇中对 2,6-吡啶二甲醛和 1,5-双(2-氨基苯氧基)-3-氮杂戊烷进行环缩合,然后使用过量的硼氢化钠对席夫碱大环锰(Ⅱ)配合物进行原位还原脱金属而合成的。报告了游离大环 L2、[CdL2(NO3)2] 4 和 [CdL2(CH3CN)2][ClO4]2 5 的晶体结构。