| abstract |
A cis-bridged metal complex (I) of formula (1) is claimed. Also claimed are (i) a process for the production of (I) by ligand exchange of metal salts and metal complexes and optionally transformation of the resulting complex to a cationic complex. The ligand exchange reaction is carried out using chelate ligands (II) of formula (2). (ii) Chelate ligands (II) . R<5> = H, 1-20C hydrocarbon, 3-30C organosilicon, or NR<6>R<7>; q = 0-20 R', R", R<6>-R<8> = H, 1-20C hydrocarbon or 3-30C organosilicon; M = Group VIIIB metal; E<1>, E<2>, Z = Group VA element; R<1>-R<4> = 1-20C hydrocarbon or 3-30C organosilicon; A<1>, B<1> = 1-4C alkylene, silylene bridged organic group or NR<8>; L<1>, L<2> = ligand, with proviso that L<1> = L<2> = Cl when R<5> is not equal to (3); x = anion; p, m, n = 0-4; and p = m x n |