title: A new inorganic-organic hybrid iron(III) arsenate: (C2H10N2)[Fe(HAsO4)2(H2AsO4)](H2O). Hydrothermal synthesis, crystal structure, and spectroscopic and magnetic properties.
abstract: A new iron(III) arsenate templated by ethylenediamine, (C2H10N2) [Fe(HAsO4)2(H2AsO4)](H2O), has been prepared by hydrothermal synthesis. The unit-cell parameters are a = 8.705(3) A, b = 16.106(4) A, c = 4.763(1) A, beta = 90.63(3) degrees; monoclinic, P2(1) with Z = 2. The compound exhibits a chain structure along the c-axis with the ethylenediammonium cations as counterion. The chains show isolated FeO6 octahedra with two HAsO4 and one H2AsO4 tetrahedra per FeO6 octahedron. The ESR spectrum at 5.0 K is isotropic with a g-value of 2.0, which remains practically unchanged at room temperature. Magnetic measurements indicate the presence of antiferromagnetic interactions. A value of -0.835 K for the J-exchange parameter has been calculated by fitting the magnetic data to a model for antiferromagnetic chains of spin S = 5/2.
authors.affiliation: Departamento de Química Inorgánica and Departamento de Mineralogía-Petrología, Facultad de Ciencias, Universidad del País Vasco, Apdo. 644, E-48080 Bilbao, Spain.
authors.forename: B
authors.initials: B
authors.lastname: Bazán
authors.forename: J L
authors.initials: JL
authors.lastname: Mesa
authors.forename: J L
authors.initials: JL
authors.lastname: Pizarro
authors.forename: L
authors.initials: L
authors.lastname: Lezama
authors.forename: M I
authors.initials: MI
authors.lastname: Arriortua
authors.forename: T
authors.initials: T
authors.lastname: Rojo