The crystal structure of the α form of anhydrous copper 8-hydroxyquinolinate

The crystal structure of the e form of anhydrous copper 8-hydroxyquinolinate, Cu(C9H6NO)2, has been determined by the Weissenberg equi-inclination X-ray method.The crystals, of bronze colored, fibrous morphology, were found to be monoclinic in the space group P21/c.The unit cell of dimensions a = 7"40 + 0.03, b = 3"84 + 0.02, c = 24"37 + 0"09/~, and 8= 98 ° 6' +_ 10', contains two molecules.Intensities were measured visually, and the data refined by difference synthesis and least squares with a final R index of 12.2 ~o including all observed reflections.Absorption corrections were neglected.The copper atoms, which lie on symmetry centers, are six-coordinated.They are bound to the two hydroxyquinolinate anions through the ring nitrogen atoms and the hydroxyl oxygen atoms in transplanar configurations, and to the oxygen atoms from adjacent molecules; they reside at the centers of distorted octahedra.The anion rings are essentially planar with the planes of the opposing anions parallel but slightly displaced from each other.The copper and oxygen atoms are displaced from both of these planes.