Abstract
Band-shape fitting studies have been made for the 1H n.m.r. spectra of complexes of the deuteriated analogue of the chelating ligand 1,2-bis(isopropylseleno)ethane with palladium(II) halides and with chromium, molybdenum, and tungsten carbonyl complexes. These studies show conclusively that the coalescence phenomenon observed in the temperature-dependent n.m.r. spectra results from inversion of configuration about the ligand atoms and not from reversal of the chelate ring. Detailed analysis of the spectra of the chelate-ring methylene protons and thermodynamic parameters for the inversion process are reported.
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