O'Neill, Francoise Marcelle Mary.2019-08-282019-08-281992https://hdl.handle.net/10539/27894A thesis submitted to the Faculty of Science, University of the Witwatersrand, Johannesburg, in fulfilment of the requirements for the degree of Doctor of Philosophy.Two aspects of the beautiful conceptual structure of M-M multiple bonding remain puzzling; the large variability of the Cr(II)-Cr(II) quadruple bonds within the Cr2 (X"Y)4L2 compounds, and their response to axial ligation. (Abbreviation abstract)enChemical bonds.Quantum chemistry.Chemistry, Physical and theoretical.Molecular orbitals.Thesis