A bond formed (actually or conceptually) by coordination of two neutral moieties, the combination of which results in charge-separated structures, e.g.
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The term is preferred to the obsolescent synonyms 'coordinate link', 'coordinate covalence', 'dative bond', 'semipolar bond'.
Source:
PAC, 1994, 66, 1077. 'Glossary of terms used in physical organic chemistry (IUPAC Recommendations 1994)' on page 1106 (https://doi.org/10.1351/pac199466051077)