In the original meaning a conjugated system is a molecular entity whose structure
may be represented as a system of alternating single and multiple bonds: e.g.
In such systems, conjugation is the interaction of one p-orbital with another across
an intervening σ-bond in such structures. (In appropriate molecular entities d-orbitals
may be involved.) The term is also extended to the analogous interaction involving
a p-orbital containing an unshared electron pair, e.g.
PAC, 1994, 66, 1077
(Glossary of terms used in physical organic chemistry (IUPAC Recommendations 1994))
on page 1099
IUPAC. Compendium of Chemical Terminology, 2nd ed. (the "Gold Book"). Compiled by
A. D. McNaught and A. Wilkinson. Blackwell Scientific Publications, Oxford (1997).
XML on-line corrected version: http://goldbook.iupac.org (2006-) created by M. Nic,
J. Jirat, B. Kosata; updates compiled by A. Jenkins. ISBN 0-9678550-9-8. https://doi.org/10.1351/goldbook