title: Trinuclear nickel(II) complex through a 2,3,5,6-tetrakis(2-pyridyl)pyrazine ligand with a linear exchange pathway.
abstract: The compound [Ni(3)(tppz)(2)(NCS)(2)(H(2)O)(4)](NO(3))(4).4H(2)O [tppz = 2,3,5,6-tetrakis(2-pyridyl)pyrazine and NCS = thiocyanate ligand] consists of trimeric units, where the three Ni(II) cations are linked by two bis-tridentate tppz ligands. This compound crystallizes in the monoclinic space group C2/c, with Z = 4, a = 25.1116(12) A, b = 10.8127(5) A, c = 25.2294(13) A, and beta = 116.856(5) degrees . The crystal structure is in good agreement with the antiferromagnetic interactions because of unidirectional coupling through the tppz ligands.
authors.affiliation: Departamento de Química Inorgánica, Facultad de Farmacia, Apartado 450, 01080 Vitoria-Gasteiz, Spain.
authors.forename: Lorena M
authors.initials: LM
authors.lastname: Callejo
authors.forename: Gotzon
authors.initials: G
authors.lastname: Madariaga
authors.forename: Luis
authors.initials: L
authors.lastname: Lezama
authors.forename: Luz
authors.initials: L
authors.lastname: Fidalgo
authors.forename: Noelia
authors.initials: N
authors.lastname: De la Pinta
authors.forename: Roberto
authors.initials: R
authors.lastname: Cortés
mesh_terms: D018360:Crystallography, X-Ray; D008024:Ligands; D008958:Models, Molecular; D015394:Molecular Structure; D009532:Nickel / Q000737:chemistry*; D009942:Organometallic Compounds / Q000138:chemical synthesis / Q000737:chemistry*; D011719:Pyrazines / Q000737:chemistry*
chemical_list: C551857:2,3,5,6-tetrakis(2-pyridyl)pyrazine; D008024:Ligands; D009942:Organometallic Compounds; D011719:Pyrazines; D009532:Nickel