Conformational studies of chelated sulphur- and selenium-containing ligands by nuclear magnetic resonance. Part II. Complexes of 1,3-bis(methylseleno)-2,2-dimethylpropane with chromium, molybdenum, and tungsten carbonyl complexes

Abstract

The preparation of the new chelated complexes [(msdp)M(CO)₄][msdp = 1,3-bis(methylseleno)-2,2-dimethyl-propane; M = Cr, Mo, or W] and their temperature-dependent ¹H n.m.r. spectra are reported. The well-resolved n.m.r. spectra are interpreted by considering total inversion of the six-membered ring system and thermodynamic parameters, obtained by n.m.r. line-shape fitting techniques, are reported for the ring inversions.