Abstract
Abstract A topological analysis, based upon Polya's theorem, was used to calculate all possible isomers of P2N2 ring derivatives, as a function of the number of substituents attached to phosphorus and nitrogen. The analysis considered four-, five- and six-coordinate phosphorus, and two-, three- and four-coordinate nitrogen. EHMO calculations established the HOMO-LUMO orbitals and the charges of variously substituted P2N2 heterocycles.
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