Cationic hydrido- and carboxylato-triphenylphosphine complexes of ruthenium

Abstract

Previous work on the protonation of acetatohydridotristriphenlphosphineruthenium(II) by fluoroboric acid has been extended. The intial red species in methanol and acetone is shown to be [RuH(PPh₃)₃L]⁺ where L = solvent. The methanol solution ages in the absence of an excess of triphenylphosphine to yellow [RuH(PPh₃)₂(H₂O)₂(MeOH)]⁺ but in the presence of PPh₃ to the µ-bonded [RuH{(η⁶-C₆H₅)PPh₂}(PPh₃)₂]⁺. In acetone the end product is [Ru(CO₂Me)(PPh₃)₃(H₂O)]⁺.

The species are characterised by i.r., ¹H, and ³¹P n.m.r. spectra and by convension into other known or easily characterisable complexes by the action of carbon monoxide and acetonitrile.

New complexes described are fluroborates salts of the ions [RuH(PPh₃)₂(H₂O)₂(MeOH)]⁺, [Ru(CO₂Me)-(PPh₃)₃(H₂O)]⁺, [Ru(CO₂Me)(PPh₃)CO]⁺, [Ru(CO₂Me)(PPh₃)₃MeCN]⁺, [Ru(H₂O)(PPh₃)₃(MeCN)₂]²⁺, [RuH(PPh₃)₂(H₂O)(CO)₂]⁺, and [RuH(PPh₃)₃(MeCN)₂]Cl, and the neutral compex RuH(CO₂C₁₇H₃₅)(PPh₃)₃.