Complexes of the platinum metals. Part IV. 1,3-Diaryltriazenido derivatives

Abstract

1,3-Diaryltriazenes, ArN:N·NHAr, react with hydrido or low-oxidation state phosphine complexes of the platinum metals to afford products containing monodentate or chelate 1,3-diaryltriazenido (ArNNNAr^–) ligands. Highly coloured, air stable, crystalline products synthesised in this manner include 1,3-diaryltriazenido derivatives of ruthenium :Ru(ArNNNAr)₂(PPh₃)₂, RuH(ArNNNAr)(CO)(PPh₃)₂, RuCl(ArNNNAr)(CO)(PPh₃)₂; osmium: Os-(ArNNNAr)₂(PPh₃)₂, OsH(ArNNNAr)(CO)(PPh₃)₂, OsH₃(ArNNNAr)(PPh₃)₂; rhodium: RhH₂(ArNNNAr)(PPh₃)₂, Rh(ArNNNAr)₃, RhCl(ArNNNAr)₂(PPh₃), Rh(NO)(ArNNNAr)₂(PPh₃), Rh(ArNNNAr)(CO)(PPh₃)₂[Rh(Ph₂PCH₂CH₂PPh₂)₂][ArNNNAr]; iridium: IrH₂(ArNNNAr)(PPh₃)₂, IrHCl(ArNNNAr)(PPh₃)₂; palladium; cis- and trans-Pd(ArNNNAr)₂(PPh₃)₂; and platinum: cis- and trans-Pt(ArNNNAr)₂(PPh₃)₂, Pt(ArNNNAr)₂[Ph₂P(CH₂)_nPPh₂](n= 2–4), and PtCl(ArNNNAr)(PR₃)₂(R = Et or Ph). The new complexes are characterised, and their stereochemistry determined, by i.r. and n.m.r. spectroscopy.