El-Basil's Fibonacci triad (FT) method has been utilised to construct the characteristic polynomials of a series of aromatic hydrocarbon radicals. These, in turn, have been used to calculate graph-theoretically the HOMO energies of a series of methylbenzenes in a hyperconjugative model. From a correlation of the calculated energies with the charge-transfer bands of their π-type molecular complexes, reasonable values of the hyperconjugative Hückel parameters of the methyl group have been found. The convenience resulting from the regressive use of FT's has been focussed on.
Volume 134, 2022
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