作者:Laurence K. Thompson、Craig J. Matthews、Liang Zhao、Claire Wilson、Michael A. Leech、Judith A. K. Howard
DOI:10.1039/b102344f
日期:——
Two flexible `polytopic' ligands take part in self assembly reactions with Ni(II) salts to produce helical structures, with `incomplete' metal ion coordination, and the occupancy of empty coordination pockets by a water molecule and a putative fluoride ion. [Ni3(pd2am-H)3(H2O)](NO3)3·2H2O 1 consists of a localized Ni2(N–N)3 dinuclear centre with three N–N single bond bridges, and a distant mono-nuclear Ni(II) centre, within the same molecular ion, and [Ni2(2pzoap)3F](BF4)3·8.5H2O 2 has a dinuclear stucture with two well separated octahedral Ni(II) sites. In both cases a single entity (H2O 1, F−2) occupies a potential coordination pocket. Antiferromagnetic coupling is observed between the adjacent Ni(II) centres in 1, associated with the N–N bridging interactions, but the distant metal centres in 2 are uncoupled.
两个灵活的“多配位”配体参与与Ni(II)盐的自组装反应,产生具有“未完全”金属离子配位的螺旋结构,并且空配位口袋由水分子和推测的氟离子占据。[Ni3(pd2am-H)3(H2O)](NO3)3·2H2O 1包含一个局部化的Ni2(N–N)3二核中心,具有三个N–N单键桥和一个远程的单核Ni(II)中心,均在同一分子离子内。而[Ni2(2pzoap)3F](BF4)3·8.5H2O 2则具有二核结构,两个八面体Ni(II)位点相隔较远。在这两种情况下,单一实体(H2O 1、F−2)占据了潜在的配位口袋。在1中,观察到邻近Ni(II)中心之间存在反铁磁耦合,这与N–N桥接相互作用有关,但在2中,远程金属中心则未耦合。