Molecular squares, cubes and chains from self-assembly of bis-bidentate bridging ligands with transition metal dications
作者:Andrew Stephenson、Michael D. Ward
DOI:10.1039/c1dt10263j
日期:——
[M4(Lth)6](BF4)8 (M = Co, Ni, Cu) are likewise molecular squares with similar structures to [Ni4(Lfur)6](BF4)8 with the significant difference that the two crosslinked double helicate M2L2 units are now homochiral. The Cd(II) complexes both behave quite differently to the first-row metal complexes, with [Cd(Lfur)(BF4)](BF4) being a simple mononuclear complex with a single ligand in which the furan oxygen atom
两个新的配体L fur和L th由两个螯合的吡唑基-吡啶末端组成,它们经由亚甲基基团连接至呋喃-2,5-二基或噻吩-2,5-二基间隔基。这些与一系列过渡金属指示物的反应更喜欢八面体协调提供了一系列基于2M:3L比率的异常结构。[M 8(L fur)12 ] X 16(M = Co,Cu,X = BF 4; M = Zn,X = ClO 4)是具有近似D 4对称性的八核立方体,其中两个环状四核螺旋体M 4 L 4个单元通过四个附加的“柱状”配体连接。相反,[Ni 4(L fur)6 ](BF 4)8是由两个双核Ni 2 L 2组成的中心对称分子正方形。通过一对额外的L Fur配体连接的相反手性的单元,以使Ni 4方形的四个边缘被两个和一个桥接配体交替跨越。[M 4(L次)6 ](BF 4)8(M =钴,镍,铜)同样分子正方形具有类似结构,以[镍4(L毛皮)6 ](BF 4)8与显著区别在于两个交联的双螺旋M