Synthesis, structure and physical characterization of the dimer {[(bpy)2Co]2(TPOA)}4+ (bpy=2,2′-dipyridyl; H2TPOA=N,N′,N′′,N′′′-tetraphenyl oxalamidine)
作者:Carlos Martí-Gastaldo、Zhi-Rong Qu、Sergio Tatay、Mario Ruben、Jose R. Galán-Mascarós
DOI:10.1016/j.molstruc.2008.05.011
日期:2008.11
Abstract The reaction between CoCl 2 , 2,2′-dipyridyl (bpy) and N , N ′, N ′′, N ′′′-tetraphenyl oxalamidine (H 2 TPOA) in a water/ethanol mixture yields the [(bpy) 2 Co] 2 (TPOA)} 2+ dimer, that is immediately oxidized in aerobic conditions leading to the Co III species [(bpy) 2 Co] 2 (TPOA)} 4+ . This cation was isolated as the [(bpy) 2 Co] 2 (TPOA)}(PF6) 4 ( 1 ) salt, that was characterized by
摘要 CoCl 2 , 2,2'-二吡啶基 (bpy) 与 N , N ', N '', N ''''-四苯基草脒 (H 2 TPOA) 在水/乙醇混合物中反应生成 [(bpy ) 2 Co] 2 (TPOA)} 2+ 二聚体,即在有氧条件下立即被氧化,导致 Co III 物种 [(bpy) 2 Co] 2 (TPOA)} 4+ 。该阳离子被分离为[(bpy) 2 Co] 2 (TPOA)}(PF6) 4 (1)盐,其特征在于单晶的X射线衍射。二聚体由两个 Co III 离子以八面体配位方式形成,由去质子化的 μ 2 -TPOA 配体桥接。Co III 离子以其低自旋构型出现。因此,二聚体基本上是抗磁性的,如 1 H NMR 和磁性测量所示。