Abstract
A fullerene graph is a cubic and 3-connected plane graph (or spherical map) that has exactly 12 faces of size 5 and other faces of size 6, which can be regarded as the molecular graph of a fullerene. T. Došlić [3] obtained that a fullerene graph with p vertices has at least (p+2)/2 perfect matchings by applying the recently developed decomposition techniques in matching theory of graphs. This note gets a better lower bound ⌈3(p+2)/4⌉ of the number of perfect matchings of a fullerene graph by finding its 2-extendability. This property further implies a chemical consequence that every derivative of a fullerene by substituting any two pairs of adjacent carbon atoms permits a Kekulé structure.
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References
D. Babić and O. Ori, Matching polynomial and topological resonance energy of C70, Chem. Phys. Letters 234 (1995) 240–244.
G. Brinkmann and A. Dress, A constructive enumeration of fullerenes, J. Algorithms 23 (1997) 345–358.
T. Došlić, On lower bounds of number of perfect matchings in fullerene graphs, J. Math. Chem. 24(1998) 359–364.
P. W. Fowler, T. Pisanski, A. Graovac and J. Žerovnik, A generalized ring spiral algorithm for coding fullerenes and other cubic polyhedra, in: Discrete Mathematical Chemistry, eds. P. Hansen, P. Fowler and M. Zheng, DIMACS, Vol. 51 (2000) pp. 175–187.
P. W. Fowler and D.E. Manolopoulos, An Atlas of Fullerenes (Oxford Univ. Press, Oxford, 1995).
D.J. Klein and X. Liu, J. Math. Chem. 11 (1992) 199.
H.W. Kroto, J. R. Heath, S.C. O'brien, R.F. Curl and R.E. Smalley, C60: Buckminsterfullerene, Nature 318 (1985) 162–163.
D.A. Holton and M.D. Plummer, 2-extendability in 3-polytopes, in: Combinatorics, Eger, Hungary, 1987, Colloq. Math. Soc. J. Bolyai, Vol. 52 (Akadémiai Kiadó, Budapest, 1988) pp. 281–300.
L. Lovász and M.D. Plummer, Matching Theory, Annals of Discrete Math., Vol. 29 (North-Holland, Amsterdam, 1986).
J. Peterson, Die Theorie der regulären Graphen, Acta Math. 15 (1891) 193–220.
M. D. Plummer, Extending matchings in graphs: An update, Congr. Numerantium 116 (1996) 3–32.
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Zhang, H., Zhang, F. New Lower Bound on the Number of Perfect Matchings in Fullerene Graphs. Journal of Mathematical Chemistry 30, 343–347 (2001). https://doi.org/10.1023/A:1015131912706
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DOI: https://doi.org/10.1023/A:1015131912706