New coordination mode of bis(diphenylphosphine) methanide diselenide. Synthesis and X-ray crystal structure of [(η5 C5Me5)Rh&{η3 (SePPh2)2CH&}]ClO4

Abstract

The dinuclear complexes [(η5 C5Me5)RhCl2]2 and [(η6 C6Me6)RuCl2]2 reacted with dppmSe2 giving the cationic compounds [(η5 C5Me5)RhCl&{η2 (SePPh2)2CH2&}]+ (1) and [(η6 C6Me6)RuCl&{η2 (SePPh2)2CH2&}]+ (2), which were isolated as perchlorate salts. Deprotonation reactions of these compounds yielded the new complexes [(η5 C5Me5)Rh&{η3 (SePPh2)2CH&}]ClO4 (3) and [(η6 C6Me6)Ru&{η3 (SePPh2)2CH&}]ClO4 (4), respectively, in which the anionic methanide diselenide ligand is acting as a tripod ligand, with a C,Se,Se′-donor set. The structure of 3 has been determined by X-ray crystallography. © 1994.