Mutual Placement of Isocyanide and Phosphine Ligands in Platinum(II) Complexes [PtHal2L1L2] (Hal = Cl, Br, I; L1,L2 = CNCy, PPh3) Leads to Highly-Efficient Photocatalysts for Hydrosilylation of Alkynes

Maria V Kashina; Andrei A Karcheuski; Mikhail A Kinzhalov; Konstantin V Luzyanin; Svetlana A Katkova

doi:10.3390/molecules28237764

Mutual Placement of Isocyanide and Phosphine Ligands in Platinum(II) Complexes [PtHal₂L¹L²] (Hal = Cl, Br, I; L¹,L² = CNCy, PPh₃) Leads to Highly-Efficient Photocatalysts for Hydrosilylation of Alkynes

Molecules. 2023 Nov 24;28(23):7764. doi: 10.3390/molecules28237764.

Authors

Maria V Kashina¹, Andrei A Karcheuski¹, Mikhail A Kinzhalov¹, Konstantin V Luzyanin², Svetlana A Katkova¹

Affiliations

¹ Institute of Chemistry, St. Petersburg University, 7/9 Universitetskaya Emb., Saint Petersburg 199034, Russia.
² Department of Chemistry, University of Liverpool, Crown Street, Liverpool L69 7SD, UK.

Abstract

A series of platinum complexes featuring phosphine and isocyanide ligands [PtX₂(PPh₃)(CNCy)] (X = Cl, Br, and I) as well as their parent phosphine [PtX₂(PPh₃)₂] and isocyanide [PtX₂(CNCy)₂] analogues have been prepared and evaluated as catalysts for the photocatalytic hydrosilylation of alkynes. Under violet light irradiation (λ_max = 400 nm), phosphine-isocyanides complexes [PtX₂(PPh₃)(CNCy)] gave high yields of silylated products (product yield up to 99%, TONs up to 1.98 × 10³). The blue light irradiation (λ_max = 450 nm) was more suitable for the parent phosphine complexes [PtX₂(PPh₃)₂], which showed comparable efficiency (product yield up to 99%, TON up to 1.98 × 10³), while isocyanide complexes [PtX₂(CNCy)₂] were not active.

Keywords: catalytic activity; hydrosilylation; isocyanide ligands; photocatalysis; platinum(II) complexes.

Grants and funding

22-23-00621/Russian Science Foundation