Metal complexes in inorganic matrices,Part II. CO reactions of chloro(carbonyl)(phosphine)rhodium complexes in a silica gel matrix

Summary Materials obtained by polycondensation of [Rh(CO)ClL₂] [L=PPh₂CH₂CH₂Si(OEt)₃] with tetraethoxysilane (TEOS) irreversibly take up CO to give monomeric or dimeric [cis-Rh(CO)₂ClL']: (L'=PPh₂CH₂CH₂SiO_3/2·xSiO₂) (2). The polymeric metal complex (2) is also obtained by CO treatment of [Rh₂(CO)₂Cl₂L'₂] (4) or by polycondensation ofin-situ prepared (monomeric or dimeric) [Rh(CO)₂ClL] with TEOS. Unlike comparable complexes in solution,(2) is extremely stable in respect to CO loss, even at higher temperatures andin vacuo.Part I of this series, ref. (1).