An X-ray crystal structure determination has been carried out on a free macrobicyclic ligand pytren (1,4,12,15,18,26,31,39,42,43,44,-undeca-azapentacyclo-[13.13.13.16,10.120,24.133,37]-tetratetraconta-4,6(42),7,9,11,18,20(43),21,23,25,31,33(44),34,36,38-pentadecane). It shows a different conformation from its Ba complex for direction of lone pairs of the six imine nitrogen atoms. Addition of dimethylsulfoxide (DMSO) to the acetonitrile solution of the Ba complex causes the conformational change of pytren ligand and driving out of the Ba ion from the cavity due to interactions of the complex with DMSO.
对游离大环
配体 pytren(1,4,12,15,18,26,31,39,42,43,44,-undeca-azapentacyclo-[13.13.13.16,10.120,24.133,37]-tetratetraconta-4,6(42),7,9,11,18,20(43),21,23,25,31,33(44),34,36,38-pentadecane)进行了X射线晶体结构测定。结果表明,在六个
亚胺氮原子的孤对方向上,其构象与Ba复合物不同。在Ba复合物的
乙腈溶液中加入
二甲基亚砜(
DMSO)会导致pytren
配体的构象变化,并由于复合物与
DMSO的相互作用而将Ba离子从空穴中驱出。