Complexes of 1,2-bis(isopropylseleno)ethane with chromium, molybdenum, and tungsten carbonyl complexes: a conformational study of a chelated selenium ligand by nuclear magnetic resonance

Abstract

The preparation and temperature-dependent ¹H n.m.r. spectra are reported for new chelated complexes [LM(CO)₄][L = 1,2-bis(isopropylseleno)ethane; M = Cr, Mo, or W]. The well resolved n.m.r. spectra are interpreted by considering total inversion of the five-membered chelate-ring system but without invoking true inversion about the ligand donor atoms.