ACTA CRYSTALLOGRAPHICA SECTION C-STRUCTURAL CHEMISTRY, vol.60, 2004 (SCI-Expanded)
The title mononuclear [Cu(sq)(phen)(2)] . 3H(2)O complex [ sq is squarate (C4O4) and phen is 1,10-phenanthroline (C12H8N2)] has been synthesized and the structure consists of a neutral mononuclear [ Cu( sq)( phen) 2] unit and three solvate water molecules. The Cu-II ion has distorted square-pyramidal coordination geometry, comprised of one carboxylate O atom from a monodentate squarate ligand and four N atoms from two chelating phen ligands. An extensive three-dimensional network of OW - H ... O/OW hydrogen bonds, face-to-face pi-pi interactions between the 1,10-phenanthroline aromatic rings and a weak pi-ring interaction are responsible for crystal stabilization.