The coordination chemistry of divalent cobalt, nickel and copper. Part 8. Selected complexes containing N-substituted pyridine-2,6-dicarboxamide ligands; crystal structure of dibromo(N,N′-dimethyl-N,N′-diphenylpyridine-2, 6-dicarboxamide)nickel(II)
作者:Jan G.H. Du Preez、Bernardus J.A.M. Van Brecht
DOI:10.1016/s0020-1693(00)83119-9
日期:1989.8
these complexes. The anion was found to be tetrahedral while the cation had a distorted tetrahedral chromophore. The reaction of NiBr2 with dpda produced two complexes; green αNiBr2(dpda) was isolated at room temperature while red βNiBr2(dpda) was obtained from hot solution. Characterisation data indicated αNiBr2(dpda) to have a pentacoordinate chromophore. The characterisation data for βNiBr2(dpda)
摘要二价钴,镍和铜与配体N,N,N',N'-四甲基吡啶-2,6-二甲酰胺(tdpa),N,N'-二甲基-N,N'-二苯基吡啶-2,为了说明这些配体的性质,讨论了6-二甲酰胺(dpda)和N,N,N',N'-四异丙基吡啶-2,6-二甲酰胺(ppda)。配合物[M-(ppda)2(ClO4)2(M = Co,Ni和Cu)和[Co-(ppda)2](ClO4)2(acet)(acet =丙酮)扭曲了八面体发色团。变形在[Cu(ppda)2](ClO4)2中最明显。在八面体[Ni(tdpa)2]-(CIO4)2中不存在这种严重变形。从热溶液中分离出同构的晶体(MCl2)3(tdpa)12(M = Ni和Co)。固体反射光谱解析为高斯分量。这些数据,结合红外和磁测量,允许将式[MC1(tpda)] 2 [MCl4]分配给这些配合物。发现该阴离子为四面体,而阳离子具有扭曲的四面体发色团。NiBr2与d