title: Synthesis, crystal structure and magnetic properties of (acetato-κ²O,O')bis(5,5'-dimethyl-2,2'-bipyridine-κ²N,N')nickel(II) perchlorate monohydrate.
abstract: The title hydrated ionic complex, [Ni(CH3COO)(C12H12N2)2]ClO4·H2O or [Ni(ac)(5,5'-dmbpy)2]ClO4·H2O (where 5,5'-dmbpy is 5,5'-dimethyl-2,2'-bipyridine and ac is acetate), (1), was isolated as violet crystals from the aqueous ethanolic nickel acetate-5,5'-dmbpy-KClO4 system. Within the complex cation, the Ni(II) atom is hexacoordinated by two chelating 5,5'-dmbpy ligands and one chelating ac ligand. The mean Ni-N and Ni-O bond lengths are 2.0628 (17) and 2.1341 (15) Å, respectively. The water solvent molecule is disordered over two partially occupied positions and links two complex cations and two perchlorate anions into hydrogen-bonded centrosymmetric dimers, which are further connected by π-π interactions. The magnetic properties of (1) at low temperatures are governed by the action of single-ion anisotropy, D, which arises from the reduced local symmetry of the cis-NiO2N4 chromophore. The fitting of the variable-temperature magnetic data (2-300 K) gives g(iso) = 2.134 and D/hc = 3.13 cm(-1).
authors.affiliation: P. J. Šafárik University in Košice, Faculty of Sciences, Institute of Chemistry, Department of Inorganic Chemistry, Moyzesova 11, 041 54 Košice, Slovakia.
authors.forename: Nela
authors.initials: N
authors.lastname: Farkašová
authors.affiliation: P. J. Šafárik University in Košice, Faculty of Sciences, Institute of Chemistry, Department of Inorganic Chemistry, Moyzesova 11, 041 54 Košice, Slovakia.
authors.forename: Juraj
authors.initials: J
authors.lastname: Černák
authors.affiliation: Instituto de Ciencia de Materiales de Aragón (ICMA), Departamento de Química Inorgánica, CSIC-University of Zaragoza, Pedro Cerbuna 12, E-50009 Zaragoza, Spain.
authors.forename: Larry R
authors.initials: LR
authors.lastname: Falvello
authors.affiliation: Centre for Low Temperature Physics of the Faculty of Science of the P. J. Šafárik University and Institute of Experimental Physics of the Slovak Academy of Science, Park Angelinum 9, 041 54 Košice, Slovakia.
authors.forename: Martin
authors.initials: M
authors.lastname: Orendáč
authors.affiliation: University of SS Cyril and Methodius, FPV, Department of Chemistry, 917 01 Trnava, Slovakia.
authors.forename: Roman
authors.initials: R
authors.lastname: Boča
keywords: 5,5′-dimethyl-2,2′-bipyridine; acetate; crystal structure; hydrogen bonds; magnetic properties; nickel complex; π–π interactions