GENERALIZED BOND ORDERS

We introduce generalized bond orders defined in terms of weighted Keku le valence structures. The weights were determined by the contribution s of linearly independent and minimal conjugated circuits in individua l Kekule valence structure. When special values for the contributions of conjugated circuits of different size are assumed, one obtains quan tities that show considerable similarity to the Pauling and the Clar's bond orders. Pauling bond orders are obtained when one assumes that a ll conjugated circuits make equal contribution to bond orders. (C) 199 4 John Wiley & Sons, Inc.