Using Pauling's Expanded Bond Order Concept in Determination of Bond Lengths in Polycyclic Aromatic Compounds Having Numerous Fixed Single and Double Bonds

Abstract

An amended Pauling bond order equation based on the number of Kekulé ( K ) and Dewar (DS) resonance structures is p_rs = ( K [G – (e_rs )] + 0.03DS[G – (e_rs )])/( K [G] + 0.03DS[G]) which reliably predicts the bond order of conjugated hydrocarbons.

Key Words:

• Bond lengths
• Chichibabin's hydrocarbon
• Dewar structures
• fixed bonds
• o-quinodimethane
• pentalene

Acknowledgments

This work was supported in part by the University of Missouri Board of Curators (K0906077).