heteroconjugation 

https://doi.org/10.1351/goldbook.H02796
  1. [obsolete] Association between a base and the conjugate acid of a different base through a hydrogen bond (B' … HB+ or A'H … A−). The term has its origin in the conjugate acid–base pair and is in no way related to conjugated systems of orbitals. Heteroassociation is a more appropriate term.
  2. [obsolete] Some authors refer to conjugated systems containing a heteroatom, e.g. pyridine, as 'heteroconjugated systems'. This usage is discouraged since it inappropriately suggests an analogy to homoconjugation, and conflicts with the currently accepted definition of that term.
Source:
PAC, 1994, 66, 1077. (Glossary of terms used in physical organic chemistry (IUPAC Recommendations 1994)) on page 1120 [Terms] [Paper]
Citation: 'heteroconjugation' in IUPAC Compendium of Chemical Terminology, 5th ed. International Union of Pure and Applied Chemistry; 2025. Online version 5.0.0, 2025. https://doi.org/10.1351/goldbook.H02796 RIS BibTex EndNote
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Last revised: February 24, 2014