Hexanuclear copper(II) complex of 2-hy-droxy- N, N'-bis-[1-(2-hy-droxy-phen-yl)ethyl-idene]propane-1,3-di-amine incorporating an open-cubane core

Abstract

The title mol-ecular structure, namely, di-aqua-tris-(μ₃-1,3-bis-{[1-(2-oxidophen-yl)ethyl-idene]amino}-propan-2-olato)-μ₃-hydroxido-dinitrato-hexa-copper(II) ethanol tris-olvate, [Cu₆(C₁₉H₁₉N₂O₃)₃(NO₃)₂(OH)(H₂O)₂]·3C₂H₅OH, corres-ponds to a non-symmetric hexa-nuclear copper complex. The complex exhibits one core in which three Cu^II metal centres are mutually inter-connected, two by two, via three phenolato oxygen anions acting in a μ₂-mode. These three copper cations are inter-connected in a μ₃-mode by one hydroxyl group. An open-cube structure is generated in which each of the Cu^II cations of the three CuO₄N units is connected by two μ₂-O anions from phenolate groups and one μ₃-O atom from a hy-droxy anion. Each of the three penta-coordinated Cu^II cations situated in the open-cube unit has a distorted NO₄ square-pyramidal environment. Each of these three Cu^II centres is inter-connected with another Cu^II cation via one enolate O atom in μ₂-mode, yielding one CuNO₄ unit and two CuNO₃ units. The penta-coordinated Cu^II atom has a distorted square-pyramidal environment while the two tetra-coordinated copper(II) cations are situated in a square-planar environment. A series of intra-molecular O-H⋯O hydrogen bonds are observed. In the crystal, the units are connected two by two by inter-molecular C-H⋯O and O-H⋯O hydrogen bonds, thus forming sheets parallel to the ac plane.

Keywords: 1,3-di­amino­propan-2-ol; 1-(2-hy­droxy­phen­yl)ethanone; crystal structure; hydrazone; open-cubane.