PAULING-WHELAND RESONANCE THEORY OF BENZENOID HYDROCARBONS
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The simple resonance-theoretic wavefunction ansatz consisting of an equally weighted combination of Kekul structures is considered in application to benzenoid hydrocarbons. The resultant resonance-theoretic expectation values are (favorably) compared to the logarithm of the number of Kekul structures. Next a simple pictorial scheme for Kekul structure enumeration on catacondensed benzenoids is developed, and extended also to Pauling -bond orders. Overall Pauling and Wheland's idea that Kekul-structure counts are of use is given some further support, for benzenoids, and the ease of computation is enhanced. 1988.