DIRHENIUM(III) COMPLEXES WITH N,N-DIMETHYLADENINE AND 7-AZAINDOLE

被引：12

作者：

LEBUIS, AM ^{[1
]}

BEAUCHAMP, AL ^{[1
]}

机构：

[1] UNIV MONTREAL,DEPT CHIM,CP 6128,SUCC A,MONTREAL H3C 3J7,QUEBEC,CANADA

来源：

INORGANICA CHIMICA ACTA | 1994年 / 216卷 / 1-2期

基金：

加拿大自然科学与工程研究理事会;

关键词：

RHENIUM COMPLEXES; PURINE COMPLEXES; DINUCLEAR COMPLEXES;

D O I：

10.1016/0020-1693(93)03739-W

中图分类号：

O61 [无机化学];

学科分类号：

070301 ; 081704 ;

摘要：

Re2X2(CH3CO2)4 (X = Cl, Br) reacts with anionic N6,N6-dimethyladenine (dmad-) in ethanol to form dark purple Re2X2(dmad)4, in which the acetate ligands are replaced by the N3/N9-bridging purine. Different relative orientations of the dissymmetric ligands about the Re-Re axis lead to four stereoisomers producing resolved signals in the H-1 NMR spectra. The compound can be reversibly protonated at N7 to yield the [ReX2(Hdmad)4]4+ ion. Hdmad and (Bu4N)2[Re2Cl8] in ethanol form a red-brown dinuclear material formulated as [Re2Cl4(Hdmad)2]-Cl.4H2O.0.5C2H5OH, where the purine is N3/N9-bridging and N7-protonated. Heating (BU4N)2[Re2Cl8] and 7-azaindole (Haza) without solvent leads to a brown Re2Cl2(aza)4 material, in which different orientations of the NI/N7-bridging ligand again produce various stereoisomers. Magnetic anisotropy of the quadruple metal-metal bond probably contributes to the very large downfield shifts observed for the C-13 signals of the carbon atoms just above the Re-Re vector.

引用

页码：131 / 138

页数：8