Abstract
Trans-[RhCl(CO)L2] (L = PPh3, AsPh3 or PCy3) react with AgBF4 in CH2Cl2 to give the novel species [Rh-(CO)L2]+ [BF4]−.nCH2Cl2 (n = 1/2 or 1 1/2) (1–3), which we believe to be stabilised by weak solvent interaction. The corresponding stibine compound cannot be isolated by the same process, instead [Rh(CO)2(SbPh3)3]+ [BF4]− (7) is formed when the reaction is carried out in the presence of CO. When reactions designed to prepare [Rh(CO)L2]+ [BF4]− are performed in the presence of CO, or [Rh(CO)L2]+ [BF4]− complexes are reacted with CO, [Rh(CO)2L2]+ [BF4]− (L = PPh3, AsPh3 or PCy3) (4–6) are formed. If Me2CO is used as solvent in the preparation of [Rh(CO)L2]+ [BF4]− (L = PPh3 or AsPh3), then the products are the four-coordinate [Rh(CO)L2-(Me2CO)]+ [BF4]− (8,9) species. The complexes have been characterised by i.r., 31P and 1H n.m.r. spectroscopy and elemental analyses.
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