The reaction of Mn(OAc)2·4H2O with 2,6-dimethoxybenzoylsalicylhydrazide (H3dmbshz) leads to a dodecanuclear manganese metallamacrocycle [Mn12(dmbshz)12(EtOH)6], 1. The successive manganese centers are connected by the hydrazide N–N groups of the ligands in an alternating pentadentate binding mode, hexadentate binding mode. The alternation results in two alternating chelation modes around the metal centers, a tridentate–tridentate chelation mode and a bidentate–tridentate chelation mode. The metal ions in 1 are in a ⋯(AAΔBCAΛB)(AAΔBCAΛB)⋯ chiral sequence, the alternation of the chiralities expanding the cyclic ring system to a 36-membered dodecanuclear manganese metallamacrocyclic ring system with S6 point group symmetry.
Mn(
OAc)2·4H2O与
2,6-二甲氧基苯甲酰
水杨酰
肼(H3dmbshz)反应,生成十二核
锰金属大环[Mn12(dmbshz)12(EtOH)6],1。连续的
锰中心通过
配体的
肼N-N基团以交替的五齿配位模式和六齿配位模式连接。这种交替作用在
金属中心周围形成两种交替的螯合模式,即三齿-三齿螯合模式和二齿-三齿螯合模式。1中的
金属离子呈⋯(
AAΔBCAΛB)(
AAΔBCAΛB)⋯手性序列,手性的交替将环状系统扩展为具有S6点群对称性的36元十二核
锰金属大环系统。