Transition-metal nitrosyl compounds. Part IV. Nitrosyl halide derivatives of rhodium(I) and iridium(I)

Abstract

The polymeric mononitrosyl complexes [Rh(NO)X₂]_n(X = Cl or Br) have been prepared by the reactions of the nitrosyl halides. NOX, with [RhX(C₈H₁₂)]₂ in dichloromethane or chloroform. An iridium mononitrosyl complex IrCl₂(NO)(C₈H₁₂) has been prepared by the reaction of NOCl with [IrCl(C₈H₁₂)]₂ in chloroform. These compounds are useful precursors for the preparation of the five-co-ordinate nitrosyl complexes MX₂(NO)L₂(L = Ph₃P or Ph₃As, X = Cl or Br) by reaction with Ph₃P or Ph₃As. Metathetical reactions of [Rh(NO)X₂]_n or IrCl₂(NO)(C₈H₁₂) with Lil or LiBr in the presence of Ph₃P or Ph₃As afford the compounds MX₂(NO)L₂(X = Cl, Br, or I). I.r. data for the region 4000–200 cm.^–1 is presented and possible structures discussed.