The binding mode of 3-hydroxypyridine to the copper ion was investigated using data from the Cambridge Structural Database and Mercury programmes. In mononuclear and dinuclear complexes, 3-hydroxypyridine terminally coordinates to the copper ion via a nitrogen or oxygen atom. In polynuclear copper complexes, terminal or bridging coordination modes are present, in some cases both; one molecule of 3-hydroxypyridine is a bridging ligand and the other is a terminal ligand. Copper(II) ions in polynuclear complexes are linked by bridging 3-hydroxypyridine molecules, with the ligand binding to a copper(II) ion via the nitrogen and to an adjacent copper(II) atom via an oxygen atom.
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