Nitrogen-15 n.m.r. characterization of bent and linear nitrosyl ligands in the solid state by cross-polarisation magic-angle-spinning spectroscopy of complexes of ruthenium

Abstract

High-resolution cross-polarisation magic-angle spinning (CP/MAS)¹⁵N n.m.r. spectroscopy of solid [RuCl(NO)₂(PPh₃)₂](BF₄) shows a large chemical shift anisotropy for the bent as compared with the linear nitrosyl ligand (in contrast to solution ¹⁵N n.m.r. which shows a bent–linear ligand fluxionality): in solid [Ru(NO)₂(PPh₃] the two near-linear nitrosyls, with Ru–N–O bond angles differing by 7°, are clearly distinguished.