Effect of the central metal on coordination of 1,10-phenanthroline-5,6-dione in Keggin-based hybrid compounds

Crystal structure of aqua-{μ-N-[3-(di-methyl-amino)-prop-yl]-N'-2-(oxidophen-yl)oxamidato}(1,10-phen-anthroline-5,6-dione)dicopper(II) perchlorate hemihydrate

The N-[3-(di­methyl­amino)­prop­yl]-N′-(2-hy­droxy­phen­yl)oxamide trianion bridges two Cu^II cations to form the binuclear complex, in which the Cu^II cations have distorted square-planar and square-pyramidal coordination geometries.

The title compound, [Cu₂(C₁₃H₁₆N₃O₃)(C₁₂H₆N₂O₂)(H₂O)]ClO₄·0.5H₂O, consists of a cis-oxamide-bridged binuclear Cu^II complex cation, a perchlorate anion and half a solvent water mol­ecule. One Cu^II cation is N,N′,N",O-chelated by an N-[3-(di­methyl­amino)­prop­yl]-N′-(2-hy­droxy­phen­yl)oxamide trianion in a distorted square-planar geometry, whereas the other Cu^II cation is O,O′-chelated by the oxamide moiety of the anion and N,N′-chelated by a 1,10-phenanthroline-5,6-dione mol­ecule, and a water mol­ecule further coordinates the second Cu^II cation, completing a distorted square-pyramidal coordination geometry. In the crystal, classical O—H⋯O hydrogen bonds, weak C—H⋯O hydrogen-bonding inter­actions and π–π stacking inter­actions link the complex cations, anions and solvent water mol­ecules into a three-dimensional supra­molecular architecture. In the crystal, the di­methyl­amino­propyl unit of the oxamide anion is disordered over two positions with an occupancy ratio of 0.561 (11):0.439 (11); the solvent water mol­ecule is also disordered over two positions, the occupancy ratio being 0.207 (10):0.293 (10).