Abstract

Two acetylinic mixed- valent rhodium(II, III) complexes: [cis-{Rh2(II,III)Cl(bpy)2(u-C=C-)}]2, (A) and cis-[Rh(II,III)Cl(bpy)2]-C=C-SiMe3, (B) (where bpy=bipyridine) have been prepared. (A) was accomplished through two pathways. The two complexes were characterized by 1H, 13C NMR, elemental, magnetic, electrochemical analyses and mass spectrophotometry. Cyclic voltametric analyses of the products from 0.00 -1.20 V display two one–electron quasi-reversible oxidation peaks which were attributed to the Rh(II), Rh(III) couple. The redox processes were separated by 528 mV, indicating a significant electronic communication between the two metallic centres. The yields of (A) and (B) were found to be 37 and 32 % respectively.

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