Crystal structure of (pyridine-κN)bis(quinolin-2-olato-κ2 N,O)copper(II) monohydrate

The title complex, [Cu(C9H6NO)2(C5H4N)]·H2O, adopts a slightly distorted square-pyramidal geometry in which the axial pyridine ligand exhibits a long Cu—N bond of 2.305 (3) Å. The pyridine ligand forms dihedral angles of 79.5 (5) and 88.0 (1)° with the planes of the two quinolin-2-olate ligands, while the dihedral angle between the quinoline groups of 9.0 (3)° indicates near planarity. The water molecule connects adjacent copper complexes through O—H⋯O hydrogen bonds to phenolate O atoms, forming a network interconnecting all the complexes in the crystal lattice.

[1]  G. Sheldrick.  Crystal structure refinement with SHELXL , 2015, Acta crystallographica. Section C, Structural chemistry.

[2]  S. Bareggi,et al.  Clioquinol: Review of its Mechanisms of Action and Clinical Uses in Neurodegenerative Disorders , 2012, CNS neuroscience & therapeutics.

[3]  Seik Weng Ng,et al.  Chlorido(8-hydroxyquinoline-κ2 N,O)(quinolin-8-olato-κ2 N,O)zinc methanol monosolvate , 2011, Acta crystallographica. Section E, Structure reports online.

[4]  Simon P. Westrip,et al.  publCIF: software for editing, validating and formatting crystallographic information files , 2010 .

[5]  L. Vendier,et al.  Preparation and study of new poly-8-hydroxyquinoline chelators for an anti-Alzheimer strategy. , 2008, Chemistry.

[6]  G. Sheldrick.  A short history of SHELX. , 2008, Acta crystallographica. Section A, Foundations of crystallography.

[7]  L. Messori,et al.  Clioquinol, a drug for Alzheimer's disease specifically interfering with brain metal metabolism: structural characterization of its zinc(II) and copper(II) complexes. , 2004, Inorganic chemistry.

[8]  H. Fun,et al.  (2-Methylquinolin-8-olato)iron(III) and -copper(II) complexes. , 2001, Acta crystallographica. Section C, Crystal structure communications.

[9]  N. Okabe,et al.  Bis­aqua­bis(8-hydroxy­quinolinato-N,O)copper(II) , 2001 .

[10]  G. J. Palenik.  The structure of coordination compounds. II. The crystal and molecular structure of the β form of anhydrous copper 8-hydroxyquinolinate , 1964 .