United atom models for polyatomic ligands. Part III. Hydrogen and methyl derivatives and the pseudohalides

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Abstract
The United Atom model is applied to simple hydrogen and methyl substituted anions of Group V and VI and to some pseudohalide ions. The electronic structures deduced using the criteria of Part 1 generally in the absence of experimental data show that in most cases the highest occupied orbital has π-like symmetry and is localized on the substituents. The ligands is capable of side-on σ donation with such an orbital alone or end-on π bond donation in conjunction with the next highest lying σ donor orbital. The bridging ability of these ligands requires the use of the σ orbital and one π lobe and is highly dependent on the bonding nature of the π orbital and the symmetry of the ligand. Lewis π acidity is unimportant in the simple anions but can occur in the pseudohalides.

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