title: A new two-dimensional molybdenum(V) nickel phosphate built up of [H18(Mo16O32)Ni16(PO4)26(OH)6(H2O)8]18- wheels.
abstract: The new molybdenum(V) nickel phosphate Na(6)Ni(6)[(Mo(2)O(4))(8)Ni(16)(H(2)PO(4))(4)(HPO(4))(10)(PO(4))(12)(OH)(6)(H(2)O)(8)].66H(2)O (1) was synthesized hydrothermally. The structure (orthorhombic, space group Cccm; a = 23.999(4), b = 36.595(6), c = 20.445(4) A) was solved from single-crystal data. The framework structure of 1 consists of anionic inorganic sheets formed by the linkages of large polyoxomolybdate rings via nickel(II) octahedra. Charge-compensating sodium atoms are interleaved between the sheets. Magnetic studies of compound 1 revealed that among the 22 nickel(II) centers, 10 are interacting. The chi(M)T = f(T) curve can be fitted using the dinuclear expression appropriate to the HDVV isotropic exchange Hamiltonian H = -2JS(1).S(2), with S(1) = S(2) = 1 and J = -24.1 cm(-)(1), showing that nickel is antiferromagnetically coupled within Ni(2) pairs.
authors.affiliation: Institut Lavoisier, IREM, UMR 8637, Université de Versailles Saint-Quentin, 45 Avenue des Etats-Unis, France.
authors.forename: Charlotte
authors.initials: C
authors.lastname: du Peloux
authors.forename: Anne
authors.initials: A
authors.lastname: Dolbecq
authors.forename: Pierre
authors.initials: P
authors.lastname: Mialane
authors.forename: Jérôme
authors.initials: J
authors.lastname: Marrot
authors.forename: Eric
authors.initials: E
authors.lastname: Rivière
authors.forename: Francis
authors.initials: F
authors.lastname: Sécheresse