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Molecules 2016, 21(3), 311;

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

Institute of Chemistry, Saint Petersburg State University, 7/9 Universitetskaya Nab., 199034 Saint Petersburg, Russia
Federal State Unitary Enterprise S.V. Lebedev Research Institute for Synthetic Rubber, Gapsal’skaya, 1, 198035 Saint Petersburg, Russia
Authors to whom correspondence should be addressed.
Academic Editor: Maxim L. Kuznetsov
Received: 1 February 2016 / Revised: 29 February 2016 / Accepted: 1 March 2016 / Published: 5 March 2016
(This article belongs to the Special Issue Metal Mediated Activation of Small Molecules)
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cis- and trans-Isomers of the platinum(II) nitrile complexes [PtCl2(NCR)2] (R = NMe2, N(C5H10), Ph, CH2Ph) 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-[PtCl2(NCCH2Ph)2] exhibits the best catalytic activity (room temperature, c = 1.0 × 10−4 mol/L, τpot-life 60 min, τcuring 6 h). Although cis-[PtCl2(NCCH2Ph)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-[PtCl2(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. View Full-Text
Keywords: platinum nitrile complexes; hydrosilylation; cross-linking; catalysis; silicon rubber platinum nitrile complexes; hydrosilylation; cross-linking; catalysis; silicon rubber

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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).

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Islamova, R.M.; Dobrynin, M.V.; Ivanov, D.M.; Vlasov, A.V.; Kaganova, E.V.; Grigoryan, G.V.; Kukushkin, V.Y. bis-Nitrile and bis-Dialkylcyanamide Platinum(II) Complexes as Efficient Catalysts for Hydrosilylation Cross-Linking of Siloxane Polymers. Molecules 2016, 21, 311.

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