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cis - and  trans -Isomers of the platinum(II) nitrile complexes [PtCl 2 (NCR) 2 ] (R = NMe 2 , N(C 5 H 10 ), Ph, CH 2 Ph) were examined as catalysts for hydrosilylation cross-linking of vinyl-terminated polydimethylsiloxane and trimethylsilyl-terminated poly(dimethylsiloxane- co -ethylhydrosiloxane) producing high quality silicone rubbers. Among the tested platinum species the  cis -complexes are much more active catalysts than their  trans -congeners and for all studied platinum complexes  cis -[PtCl 2 (NCCH 2 Ph) 2 ] exhibits the best catalytic activity (room temperature,  c  = 1.0 × 10 −4  mol/L, τ pot-life  60 min, τ curing  6 h). Although  cis -[PtCl 2 (NCCH 2 Ph) 2 ] is less active than the widely used Karstedt’s catalyst, its application for the cross-linking can be performed not only at room temperature ( c  = 1.0 × 10 −4  mol/L), but also, more efficiently, at 80 °C ( c  = 1.0 × 10 −4 –1.0 × 10 −5  mol/L) and it prevents adherence of the formed silicone rubbers to equipment. The usage of the  cis - and  trans -[PtCl 2 (NCR) 2 ] complexes as the hydrosilylation catalysts do not require any inhibitors and, moreover, the complexes and their mixtures with vinyl- and trimethylsilyl terminated polysiloxanes are shelf-stable in air. Tested catalysts do not form colloid platinum particles after the cross-linking.

bis-Nitrile and bis-Dialkylcyanamide Platinum(II) Complexes as Efficient Catalysts for Hydrosilylation Cross-Linking of Siloxane Polymers