Dinuclear Triple Helicates with Diazine Ligands: X-ray Structural, Electrochemical, and Magnetic Studies
作者:Subramanya Gupta Sreerama、Samudranil Pal
DOI:10.1021/ic050704f
日期:2005.9.1
In each complex, three dinucleating O,N,N,O donor ligands provide three diazine (=N-N=) bridges between the metal ions and facial O3N3 coordination spheres around them. The ligands are twisted about the N-N single bond and coordinate to the two metal ions in a helical fashion to generate the triple helical structure. The dicobalt(III) complex of mesalhn2- is D3-symmetric, while the diiron(III) analogue
据报道,Mn(III),Fe(III)和Co(III)与两个二嗪席夫碱H2salhn和H2mesalhn形成了一系列双核配合物。席夫碱是通过肼与水杨醛(H2salhn)和2-羟基苯乙酮(H2mesalhn)以1:2摩尔比的缩合反应制备的。X射线晶体学表征显示[Co2(salhn)3],[Co2(mesalhn)3]和[Fe2(mesalhn)3]的三重螺旋结构。在每个复合物中,三个成核的O,N,N,O供体配体在金属离子和它们周围的O3N3配位面之间提供了三个二嗪(= NN =)桥。配体绕NN单键扭曲,并以螺旋方式与两个金属离子配位,以生成三重螺旋结构。mesalhn2-的二甲双(III)配合物是D3对称的,而二铁(III)类似物非常接近这种对称性。另一方面,由于三个配体的扭转角所覆盖的范围较大,salhn2-的二甲双(III)络合物明显偏离了理想的D3-对称性。在这些配合物的晶格中,分子间的CH