 9524 BERGER J., AVRON J.
 A Classification Scheme for Toroidal Molecules
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Jan 24, 95

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Abstract. We construct a class of periodic tilings of the plane, which corresponds to
toroidal arrangements of trivalent atoms, with pentagonal, hexagonal and
heptagonal rings. Each tiling is characterized by a set of four integers
and gives rise to an infinite family of toroidal molecules. These may be
chosen to fit a desired shape, size or number of atoms in the molecule.
The configurational energy and the delocalisation energy of several
molecules obtained in this way were computed for Tersoff and H\"uckel
models. The results indicate that many of these molecules would be stable.
We studied the influence of size on the H\"{u}ckel spectrum: it bears both
similarities and differences as compared with the case of tubules.
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