Preparation and chemical and spectroscopic properties of bis(difluorophosphino) selenide

Abstract

Bis(difluorophosphino) selenide has been prepared by the exchange reactions of PBrF₂ and PCLF₂ with Se(SiH₃)₂ and Se(SnBu₃)₂. It has been characterised by vrbrational, mass, n.m.r., and photoelectron spectroscopy. Spectroscopic results have also been obtained for bis(difluorophosphino) sulphide, prepared by analogous methods. Both compounds react with Brønsted acids to give PF₂HSe or PF₂HS, and a difluorophos-phine derivative of the acid. Basic properties are shown by the reactions with diborane, which give the mono-borane adducts, and by the displacement of norbornadiene from [Mo(C₇H₈)(CO)₄]. The latter reaction illustrates the potential usefulness of these compounds as chelating bidentate hgands. With chlorine the selenide gives PCl₃F₂ and PClF₂Se.