XX–NhNh–NaNa donor sites (Nh, heterocyclic nitrogen; Na, azo nitrogen) is uniformly cis–trans–cis. In the structure of [Re(L)3]ReO4 the tris chelate has facial geometry. The isomer preference of both families is exclusive, no other isomer having been observed in any of the preparations. The 1H NMR spectra of the tris chelates are consistent with the facial geometry. The bis chelates are one-electron paramagnets
[Re V O(OEt)X 2(PPh 3)2 ](X = Cl,Br,I)与2-(芳基偶氮)-1-甲基
咪唑(芳基= Ph(L 1),C 6 H 4 Me– p(L 2)或C 6 H 4 Cl- p(L 3))以及2-(
对甲苯基)-1-苄基
咪唑(L 4)在
甲苯提供了[Re II X 2(L)2 ]类型的橙色双螯合物。绿色特里斯螯合物[Re I(L)3 ] ReO 4是在
配体过量使用。类似的bis和特里斯还可以通过使[ReOCl 3(PPh 3)2 ]与2-(芳基偶氮)
吡啶(芳基= Ph(L 5),C 6 H 4 Cl- p(L 6))。[ReCl 2(L 2)2 ],[ReI 2(L 4)2 ]和[ReCl 2(L 6)2 ]的结构确定显示,XX–N h N h h –N a N的异构体几何一个供体部位(N ħ,杂环氮; ñ一个,偶氮 氮)统一为顺式-反式-顺式。在[Re(L)3 ] ReO