title: Structure, spectroscopic properties, and reversible solid-to-solid reactions of metal complexes of 5-nitro-pyrimidin-2-olate.
abstract: In searching for coordination polymers containing the highly polarized 5-nitro-pyrimidin-2-olate ligand (NP), a number of species containing 3d transition metals have been prepared and characterized, namely Co(NP)2(H2O)4, [Co(NP)2]n, Ni(NP)2(H2O)4, [Ni(NP)2]x, and [Zn(NP)2]n. Their structures have been determined by X-ray powder diffraction methods. The hydrated compounds contain mononuclear M(NP)2(H2O)4 units interconnected by means of a three-dimensional (3D) network of hydrogen bonds. The homoleptic species, at variance from the already known metal(II) pyrimidin-2-olate ones, crystallize as two-dimensional (2D) slabs, where the metal coordination is of the MN3O kind. The electron-withdrawing nitro group, never bound to the metal ion, is likely to influence the observed stereochemistry through steric and dipolar effects within the crystal lattice. The thermal, spectroscopic, and magnetic properties of these species are presented. The M(NP)2(H2O)4/[M(NP)2]x,n systems interconvert reversibly upon dehydration/rehydration processes.
authors.affiliation: Departamento de Química Inorgánica, Universidad de Granada, Av. Fuentenueva S/N, 18071 Granada, Spain.
authors.forename: Elisa
authors.initials: E
authors.lastname: Barea
authors.forename: M Angustias
authors.initials: MA
authors.lastname: Romero
authors.forename: Jorge A R
authors.initials: JA
authors.lastname: Navarro
authors.forename: Juan M
authors.initials: JM
authors.lastname: Salas
authors.forename: Norberto
authors.initials: N
authors.lastname: Masciocchi
authors.forename: Simona
authors.initials: S
authors.lastname: Galli
authors.forename: Angelo
authors.initials: A
authors.lastname: Sironi