1. [obsolete] @A00472@ between a base and its conjugate acid through a @H02899@ (B … HB+ or AH … A). Homoassociation is a more appropriate term for this phenomenon.
  2. The orbital overlap of two π-systems separated by a non-conjugating group, such as CH2.
    See also:
    conjugate acid–base pair
    conjugated system
PAC, 1994, 66, 1077. (Glossary of terms used in physical organic chemistry (IUPAC Recommendations 1994)) on page 1121 [Terms] [Paper]