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

The title molecular structure, namely, (mu(3)-acetato)(mu(2)-acetato)bis(mu(3) -1,3-bis{[1-(2-oxidophenyl)ethylidene]amino}propan-2-olato)tetracopper (II) monohydrate, [Cu-4(C19H19N2O3)(2)(CH3CO2)]center dot H2O, 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 mu(2)-mode and one ligand molecule that connects three copper Cu-II metal centres via its ethanolato oxygen anion acting in a mu(3)-mode. One bridging acetate group acting in an eta(1):eta(1) -mu(2)-mode connects two copper(II) ions while another bridging acetate group connects three copper (II) ions in an eta(1):-eta(2)-mu(3)-mode. A chair-like Cu3O3 structure is generated in which the two CuO4N units are connected by one mu(2)-O ethanolate oxygen atom. These two units are connected respectively to the CuO3N unit via one mu(3)-O ethanolate oxygen atom and one mu(2)-O atom from an acetate group. The mu(3)-O atom also connects one of the CuO4N units and the CuO3N unit to another CuO3N unit, which is out of the chair-like structure. Each of the two pentacoordinated Cu-II cations has a distorted NO4 square-pyramidal environment. The geometry of each of the two CuNO3 units is best described as a slightly square-planar environment. A series of intramolecular O-H center dot center dot center dot O hydrogen bonds is observed. In the crystal, the units are connected by intermolecular C-H center dot center dot center dot O and O-H center dot center dot center dot O hydrogen bonds, thus forming sheets parallel to the ac plane

Automated summary

This article presents the molecular structure of a non-symmetric tetranuclear copper complex, which contains two ligand molecules connecting copper ions in different modes. A chair-like Cu3O3 structure is formed in the crystal, and multiple hydrogen bonds are observed.