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-Electron Energy of Benzenoid Hydrocarbons

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Estimating and Approximating the Total

-Electron Energy of Benzenoid Hydrocarbons

I. Gutman, J. H. Koolen

a

, V. Moulton

b

, M. Parac

c

, T. Soldatovi´c, and D. Vidovi´c

Faculty of Science, University of Kragujevac, P. O. Box 60, YU-34000 Kragujevac, Yugoslavia

aFSPM-Strukturbildungsprozesse, University of Bielefeld, D-33501 Bielefeld, Germany

bPhysics and Mathematics Department (FMI), Mid Sweden University, Sundsvall, S-85170, Sweden

cFaculty of Physical Chemistry, University of Belgrade, YU-11001 Beograd, Yugoslavia Reprint requests to Prof. I. G.; Fax: +381 34 335040; E-mail: gutman@knez.uis.kg.ac.yu Z. Naturforsch. 55 a, 507–512 (2000); received January 27, 2000

Lower and upper bounds as well as approximate formulas for the total

-electron energy (

E

)

of benzenoid hydrocarbons are deduced, depending only on the number of carbon atoms (

n

)

and number of carbon-carbon bonds (

m

). These are better than the several previously known (

n;m

)-type estimates and approximations for

E

.

Key words: Total

-Electron Energy; Benzenoid Hydrocarbons.

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