On the π-Electron Content of Rings in Benzenoid Parallelograms Tomislav Doˇsli´c

Within classes of benzenoid isomers (which all have equal n and m ), the Estrada index is linearly proportional to the number of bay regions. Key words: Estrada Index;

Randi´c and Balaban [6, 7] proposed to assess the distribution of π -electrons in rings of polycyclic con- jugated molecules by taking the arithmetic average of the π -electron

Within series of isomeric benzenoid hydrocarbons there is a very good linear correlation between the topological resonance energy (T RE) and the total π-electron energy (E π

tion (SD) for the correlation between the topological reso- nance energy (T RE) and total π -electron energy (E π ) of sets of benzenoid isomers with h six-membered rings and n i

If the benzenoid molecule does not possess essential single and double bonds, then the Pauling bond orders are greater than 0 and less than 1, but may assume values arbitrarily close

If the benzenoid molecule does not possess essential single and double bonds, then the Pauling bond orders are greater than 0 and less than 1, but may assume values arbitrarily close

c Faculty of Physical Chemistry, University of Belgrade, YU-11001 Beograd, Yugoslavia Reprint requests to Prof. These are better than the several previously known ( n;m )-type

The dihedral angles C-E-E-C range from 79(2) to 96(1) are consistent with the concept of minimized p lone-pair repulsion of adjacent chalcogen atoms.. The dependence of