Ground States of Conjugated Molecules . X V . Bond Localization and Resonance Energies in Compounds Containing Nitrogen or Oxygen

T he heats o f form ation o f, and bon d lengths in, a num ber o f classical conjugated m olecu les contain ing nitrogen or oxygen have been calculated by the m eth od o f part X II o f this series. T he results im ply th a t the b on d s in com poun ds o f th is type can be regarded as localized . U sin g the bon d energies deduced in th is w ay, resonance energies are calcu lated for a num ber o f arom atic, and potentia lly arom atic, com poun ds conta in ing nitrogen or