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Advances in the Theory of Benzenoid Hydrocarbons by Louis J. Allamandola (auth.), Professor Dr. Ivan Gutman,

By Louis J. Allamandola (auth.), Professor Dr. Ivan Gutman, Professor Dr. Sven J. Cyvin (eds.)

Contents: L.J. Allamandola, Moffett box, CA, united states: Benzenoid Hydrocarbons in house: The facts and Implications

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One of the orbitals is depicted in Fig. 3 x 10-11 m) above the crh molecular plane. Each of the orbitals closely resembles a C(2p) function, pointing perpendicular to the ring, but is distorted symmetrically towards the carbon atoms on either side. It is important to bear in mind that each spin-coupled orbital contains just one electron. Thus, for example, if orbital q01 is localized about nucleus A and q02 is localized about nucleus B, then this is equivalent to saying that the electrons tend to "keep out of each other's way": their Coulombic repulsions are reduced, and so the state becomes considerably more stable.

Environ. 12:923 25 The Distortive Tendencies of Delocalized rc Electronic Systems. Benzene, Cyclobutadiene and Related Heteroannulenes Philippe Charles Hiberty Laboratoire de Chimie Th6orique,* B~t. 490, Universit6 de Paris-Sud, F-91405 Orsay, France Table of Contents 1 Introduction . . . . . . . . . . . . . . 1 High Spin States . . . . 2 G r o u n d States . . . . 3 Effect of c-Electron Correlation 29 . . . . . . . . . Forces . . . . . . . . . . . . . . .

Chem. Phys. 81:4200 43~ Tokunaga AT, Nagata T, Sellgren K, Smith RG, Onaka T, Nakada Y, Sakata A, Wada S (1988) Ap. J. 328:709 44. Geballe TR, Lacy JH, Persson SE, McGregor PJ, Soifer BT (1985) Ap. J. 292:500 45. de Muizon M, Geballe TR, d'Hendecourt LB, Baas F (t986) Ap. J. (Letters) 306:LI05 46. Geballe TR, Tielens AGGM, Atlamandola LJ, Moorhouse A, Brand PWJL (1989) Ap. : 341, 278 47. BregmanJD, Allamandola LJ, Tielens AGGM, Witteborn FC Ap. J. (in press) 48. Cohen M, Tielens AGGM, Bregman JD, Witteborn FC, Rank DM, Allamandola L J, Wooden DH, de Muizon M 1989 Ap.

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