title: Heptanickel(ii) double-cubane core in wells-dawson heteropolytungstate, [Ni7(OH)6(H2O)6(P2W15O56)2](16-).
abstract: The hepta-Ni(2+)-containing 30-tungsto-4-phosphate(v) [Ni7(OH)6(H2O)6(P2W15O56)2](16-) (1) has been synthesized in aqueous, slightly basic medium under conventional reaction conditions, and charactarized via different physical methods. Single-crystal XRD showed that 1 consists of a corner-fused double-cubane {Ni7(OH)6(H2O)6}(8+) fragment sandwiched by two trilacunary [P2W15O56](12-) units. Polyanion 1 is solution-stable as shown by (31)P NMR. Ferromagnetic coupling interaction between the 7 paramagnetic centers of the double-cubane core in 1 with a S = 7 ground state was demonstrated. Electrochemical studies were also performed on 1.
authors.affiliation: Jacobs University, Department of Life Sciences and Chemistry, P.O. Box 750 561, 28725 Bremen, Germany. u.kortz@jacobs-university.de.
authors.forename: Bassem S
authors.initials: BS
authors.lastname: Bassil
authors.forename: Yixian
authors.initials: Y
authors.lastname: Xiang
authors.forename: Ali
authors.initials: A
authors.lastname: Haider
authors.forename: Jaime
authors.initials: J
authors.lastname: Hurtado
authors.forename: Ghenadie
authors.initials: G
authors.lastname: Novitchi
authors.forename: Annie K
authors.initials: AK
authors.lastname: Powell
authors.forename: A Martin
authors.initials: AM
authors.lastname: Bossoh
authors.forename: Israël M
authors.initials: IM
authors.lastname: Mbomekallé
authors.forename: Pedro
authors.initials: P
authors.lastname: de Oliveira
authors.forename: Ulrich
authors.initials: U
authors.lastname: Kortz