Synthetic, spectroscopic and X-ray crystallographic studies on complexes formed between indium(III) iodide and phosphine ligands

Abstract

The 1 : 1 adducts of Inl₃ with various phosphine ligands [PR₃; R₃= Buⁱ₃, HPh₂, HBu^t₂ or H(C₆H₁₁)₂(C₆H₁₁= cyclohexyl)] have been prepared and characterised, and their solution properties, as examined by ¹H, ³¹P and ¹¹⁵In NMR and conductivity measurements, indicate the presence of only neutral species. Infrared and Raman data have been recorded for the adducts in the solid state and compared with other published data. X-Ray studies on Inl₃·PHR₂(R = Ph or Bu^t) confirm the presence of neutral compounds containing four-co-ordinate indium atoms, but reveal that significant intermolecular interactions (In–I–In, P–H–I, In–I–I–In) are present.