title: trans-Di-aqua-bis-(pyridazine-3-carboxyl-ato-κ(2) N (2),O)cobalt(II) dihydrate.
abstract: The title compound, [Co(C5H3N2O2)2(H2O)2]·2H2O, contains a Co(II) ion on an inversion center, exhibiting an octa-hedral coordination geometry. The equatorial plane is formed by two trans-related N,O-bidentate pyridazine-3-carboxyl-ate ligands and the axial positions are occupied by two water mol-ecules. The Co(II) complex mol-ecules are stacked in a column along the a-axis direction by an O-H⋯N hydrogen bond between the non-coordinating pyridazine N atom and the coordinating water mol-ecule. These columns are further connected into a layer parallel to the ac plane by additional hydrogen bonds involving the coordinating and non-coordinating water mol-ecules, and the non-coordinating carboxyl-ate O atom. The crystal packing is completed by inter-layer weak C-H⋯O inter-actions.
authors.affiliation: Departamento de Química Inorgánica, Facultad de Ciencia y Tecnología, Universidad de País Vasco UPV/EHU, PO Box 644, E-48080 Bilbao, Spain.
authors.forename: Beñat
authors.initials: B
authors.lastname: Artetxe
authors.forename: Santiago
authors.initials: S
authors.lastname: Reinoso
authors.forename: Leire
authors.initials: L
authors.lastname: San Felices
authors.forename: Jagoba
authors.initials: J
authors.lastname: Martín-Caballero
authors.forename: Juan M
authors.initials: JM
authors.lastname: Gutiérrez-Zorrilla
references.citation: Acta Crystallogr A. 2008 Jan;64(Pt 1):112-22
references.pmid: 18156677
references.citation: Acta Crystallogr D Biol Crystallogr. 2009 Feb;65(Pt 2):148-55
references.pmid: 19171970