ELECTRON-TRANSFER PROPERTIES OF A SERIES OF BIMETALLIC RHODIUM(I) AND IRIDIUM(I) COMPLEXES

被引:6
作者
ANDERSON, JE [1 ]
GREGORY, TP [1 ]
NET, G [1 ]
BAYON, JC [1 ]
机构
[1] UNIV AUTONOMA BARCELONA,DEPT QUIM,E-08193 BARCELONA,SPAIN
来源
JOURNAL OF THE CHEMICAL SOCIETY-DALTON TRANSACTIONS | 1992年 / 03期
关键词
D O I
10.1039/dt9920000487
中图分类号
O61 [无机化学];
学科分类号
070301 ; 081704 ;
摘要
The electron-transfer properties of [NBu4][M2(dcbmi)(CO)4], [NBu4][M2(dcbmi)(cod)2], (M = Rh or Ir) and [NBu4][Rh2(dcbmi)(CO)2(PPh3)2] (H3dcbmi = 2-methylimidazole-4,5-dicarboxylic acid, cod = cycloocta-1,5-diene) were determined by electrochemical, UV/VIS and infrared spectroelectrochemical, and synthetic investigations. Relatively easy oxidations, but no reduction processes, were observed in acetonitrile, methylene chloride or tetrahydrofuran. The effect of the solvent on the electron-transfer properties of these complexes is discussed and the spectroelectrochemical results establish the site of electron transfer. Surface effects are observed and for [NBu4]Ir2(dcbmi)(CO)4] the growth of a conducting film has been monitored by cyclic voltammetry. Partial oxidation of [Ir2(dcmbi)(CO)4]- results in formation of [NR4]0.5[Ir2(dcbmi)(CO)4] (R = Bu or Pr). Isotropic conductivities, measured on pressed pellets at room temperature, were 8 x 10(-5) ohm-1 cm-1 for R = Pr and 2 x 10(-5) ohm-1 cm-1 for R = Bu. The synthesis of [ttf]Rh2(dcbmi)(CO)4] (ttf = tetrathiofulvalene) and the mixed-valence species [Rh2(dcbmi)(CO)4] is also reported; the former exhibits solid-state conductive properties, presumably due to the ttf cation.
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页码:487 / 495
页数:9
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