Abstract
Estrada Index, EE(G), defined as the sum of exponentials of the eigenvalues of the adjacency matrix of graph G, is calculated for sets of general cubic polyhedra, and for general and isolated-pentagon fullerenes. Amongst small cubic polyhedra, the “near-fullerenes” and fullerenes minimise EE. Amongst fullerenes, the isolated-pentagon fullerenes minimise EE. The preference for fullerenes over non-fullerenes is significant, but the relative variation of EE with fullerene isomer is tiny (parts per million for general fullerenes, parts per billion for isolated-pentagon fullerenes) and is essentially tracking the number of pentagon adjacencies (and hence overall stability).
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Fowler, P.W., Graovac, A. (2011). The Estrada Index and Fullerene Isomerism. In: Cataldo, F., Graovac, A., Ori, O. (eds) The Mathematics and Topology of Fullerenes. Carbon Materials: Chemistry and Physics, vol 4. Springer, Dordrecht. https://doi.org/10.1007/978-94-007-0221-9_14
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DOI: https://doi.org/10.1007/978-94-007-0221-9_14
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