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 proof and Implications
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Additional info for Advances in the Theory of Benzenoid Hydrocarbons
Chem. 92:5086 8. Shaik SS, Hiberty PC (1985) J. Amer. Chem. Soc. 107:3089 9. (a) Longuet-Higgins HC, Salem L (1959) Proc. Roy. , A251: 172; (b) Salem L (1972) The Molecular Theory of Conjugated Systems, Benjamin, Reading, MA, p 103-106, 494-505; (c) Paldus J, Chin E (1983) Int. J. Quant. Chem. 24: 373; (d) Epiotis ND (1984) Nouv. J. Chim. 8: 11; (e) For a discussion, see Ref  10. Berry RS (1961) J. Chem. Phys. 35: 29, 2253 11. Shaik SS, Hiberty PC, Ohanessian G, Lefour J-M (t985) Nouv. J. Chim.
In general, it is important to include all of the modes of spin coupling, especially when considering the making or breaking of chemical bonds. The spin-coupled wavefunction may be written in the form  s~ IY~ S M -~t (1) Cskd(qh cP2 .. • q~NOs~; N k) where the CSk are called spin-coupling coefficients, d is the antisymmetrizer, q~,(r,) is one of the spatial orbitals, and OSM;k N is an N-electron spin function. The spin functions (and thus the total wavefunction) are eigenfunctions of g2 and of S~, with eigenvalues S(S + 1) h 2 and Mh, respectively.
30 . . 32 33 33 34 4 Distortive n-Propensity and Resonance Energy . . . . . . . 1 Q u a n t u m Mechanical Resonance Energy . . . . . . . 2 The Origin of the Thermochemical Resonance Energy . . . . 4,3 The Relationship Between T R E and Q M R E . . . . . . 5 Hetero~mnulenes . . . . . . . . . . . . . 1 Six-Membered Rings . . . . . . . . . . . 2 F o u r - M e m b e r e d Rings . . . . . . . . . . . 6 Conclusion . . .