Diphosphines containing silane groups, immobilised diphosphines and the use thereof as hydrogenation catalysts

A solid carrier material which contains a diphosphine rhodium or iridium complex fixed on the surface thereof, which carrier material has the formula IV or IVa ##STR8## wherein Y denotes two monoolefin ligands or a diene ligand, M is Ir(I) or Rh(I), Z is --Cl, --Br or --I, A.sup..crclbar. is the anion of an oxyacid or complex acid, T is a solid carrier material, r is 0, 1 or 2, R.sub.1 denotes identical or different radicals and is linear or branched C.sub.1 -C.sub.12 alkyl, unsubstituted C.sub.5 -C.sub.6 cycoalkyl or C.sub.5 -C.sub.6 cycloalkyl which is substituted by C.sub.1 -C.sub.4 alkyl or C.sub.1 -C.sub.4 alkoxy, or is phenyl or benzyl, or both substituents R.sub.1 of a group (R.sub.1).sub.2 P are o,o'-diphenylene, R.sub.2 is hydrogen, linear or branched C.sub.1 -C.sub.12 alkyl, phenyl or benzyl, R.sub.3 is C.sub.1 -C.sub.12 alkylene, R.sub.4 is C.sub.2 -C.sub.18 alkylene, phenylene or benzylene, and R.sub.5 is C.sub.1 -C.sub.6 alkyl or phenyl.