title: Tetra-aqua-(4,5-diaza-fluoren-9-one-κN,N')nickel(II) dinitrate.
abstract: The title compound, [Ni(C(11)H(6)N(2)O)(H(2)O)(4)](NO(3))(2), was prepared by the reaction of Ni(NO(3))(2) and 4,5-diaza-fluoren-9-one (dafo). The crystal packing consists of a three-dimensional network via O-H⋯O hydrogen bonds between the coordin-ated water mol-ecules and the nitrate anions. The Ni atom lies on a special position (Wyckoff position 4e, site symmetry 2), as does the carbonyl O atom.
authors.affiliation: Microscale Science Institute, Department of Chemistry and Chemical Engineering, Weifang University, Weifang 261061, People's Republic of China.
authors.forename: Meng
authors.initials: M
authors.lastname: Guo