title: Crystal structure of an eight-coordinate terbium(III) ion chelated by N,N'-bis-(2-hy-droxy-benz-yl)-N,N'-bis-(pyridin-2-ylmeth-yl)ethyl-enedi-amine (bbpen(2-)) and nitrate.
abstract: The reaction of terbium(III) nitrate penta-hydrate in aceto-nitrile with N,N'-bis-(2-hy-droxy-benz-yl)-N,N'-bis-(pyridin-2-ylmeth-yl)ethyl-enedi-amine (H2bbpen), previously deprotonated with tri-ethyl-amine, produced the mononuclear compound [N,N'-bis-(2-oxidobenzyl-κO)-N,N'-bis-(pyridin-2-ylmethyl-κN)ethylenedi-amine-κ(2) N,N'](nitrato-κ(2) O,O')terbium(III), [Tb(C28H28N4O2)(NO3)]. The mol-ecule lies on a twofold rotation axis and the Tb(III) ion is eight-coordinate with a slightly distorted dodeca-hedral coordination geometry. In the symmetry-unique part of the mol-ecule, the pyridine and benzene rings are both essentially planar and form a dihedral angle of 61.42 (7)°. In the mol-ecular structure, the N4O4 coordination environment is defined by the hexa-dentate bbpen ligand and the bidentate nitrate anion. In the crystal, a weak C-H⋯O hydrogen bond links mol-ecules into a two-dimensional network parallel to (001).
authors.affiliation: Departamento de Química, Universidade Federal do Paraná, Centro Politécnico, Jardim das Américas, 81530-900 Curitiba-PR, Brazil.
authors.forename: Thaiane
authors.initials: T
authors.lastname: Gregório
authors.affiliation: Departamento de Química, Universidade Federal do Paraná, Centro Politécnico, Jardim das Américas, 81530-900 Curitiba-PR, Brazil.
authors.forename: André Luis
authors.initials: AL
authors.lastname: Rüdiger
authors.affiliation: Departamento de Química, Universidade Federal do Paraná, Centro Politécnico, Jardim das Américas, 81530-900 Curitiba-PR, Brazil.
authors.forename: Giovana G
authors.initials: GG
authors.lastname: Nunes
authors.affiliation: Departamento de Química, Universidade Federal do Paraná, Centro Politécnico, Jardim das Américas, 81530-900 Curitiba-PR, Brazil.
authors.forename: Jaísa F
authors.initials: JF
authors.lastname: Soares
authors.affiliation: School of Chemistry, University of East Anglia, Norwich NR4 7TJ, England.
authors.forename: David L
authors.initials: DL
authors.lastname: Hughes
keywords: N,N′-bis(2-hy­droxy­benz­yl)-N,N′-bis­(pyridin-2-ylmeth­yl)ethyl­enedi­amine; crystal structure; dodeca­hedral.; lanthanide; mononuclear; terbium(III)