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The title molecular structure, namely, (μ 3 -acetato)(μ 2 -acetato)bis(μ 3 -1,3-bis{[1-(2-oxidophenyl)ethylidene]amino}propan-2-olato)tetracopper(II) monohydrate, [Cu 4 (C 19 H 19 N 2 O 3 ) 2 (CH 3 CO 2 ) 2 ]·H 2 O, corresponds to a non-symmetric tetranuclear copper complex. The complex exhibits one ligand molecule that connects two copper Cu II  metal centres  via  its ethanolato oxygen anion acting in a μ 2 -mode and one ligand molecule that connects three copper Cu II  metal centres  via  its ethanolato oxygen anion acting in a μ 3 -mode. One bridging acetate group acting in an η 1 :η 1 -μ 2 -mode connects two copper(II) ions while another bridging acetate group connects three copper(II) ions in an η 1 :-η 2 -μ 3 -mode. A chair-like Cu 3 O 3  structure is generated in which the two CuO 4 N units are connected by one μ 2 -O ethanolate oxygen atom. These two units are connected respectively to the CuO 3 N unit  via  one μ 3 -O ethanolate oxygen atom and one μ 2 -O atom from an acetate group. The μ 3 -O atom also connects one of the CuO 4 N units and the CuO 3 N unit to another CuO 3 N unit, which is out of the chair-like structure. Each of the two pentacoordinated Cu II  cations has a distorted NO 4  square-pyramidal environment. The geometry of each of the two CuNO 3  units is best described as a slightly square-planar environment. A series of intramolecular O—H...O hydrogen bonds is observed. In the crystal, the units are connected by intermolecular C—H...O and O—H...O hydrogen bonds, thus forming sheets parallel to the  ac  plane

Tetranuclear copper(II) complex of 2-hydroxy-N,N′-bis[1-(2-hydroxyphenyl)ethylidene]propane-1,3-diamine