6533b836fe1ef96bd12a084c
RESEARCH PRODUCT
A New Heptanuclear Cobalt(II) Cluster Encapsulated in a Novel Heteropolyoxometalate Topology: Synthesis, Structure, and Magnetic Properties of [Co7(H2O)2(OH)2P2W25O94]16-
José Ramón Galán-mascarósAnd Carlos Giménez-saizCarlos J. Gómez-garcíaAlicia Forment-aliagaJuan M. Clemente-juanEugenio Coronadosubject
ChemistryInorganic chemistrychemistry.chemical_elementTriclinic crystal systemInorganic ChemistryCrystallographychemistry.chemical_compoundTungstateOctahedronGroup (periodic table)TetrahedronCluster (physics)AntiferromagnetismPhysical and Theoretical ChemistryCobaltdescription
The synthesis and the structural and magnetic characterization of a novel heptanuclear cobalt cluster encapsulated in a heteropolyoxotungstate is reported. This complex shows how it is possible to control the nuclearity of the Co clusters formed in a tungstate solution by slightly changing the synthetic conditions, and the relevance of pH in this regard. This heptanuclear complex [Co7(H2O)2(OH)2P2W25O94]16- (Co7) crystallizes in the triclinic space group P1 (a = 12.3403(6) A, b = 22.5966(11) A, c = 23.2645(12) A, α = 68.7830(11)°, β = 83.7981(12)°, γ = 78.5423(13)°, V = 5922.4(5) A3, Z = 2) and is formed by six CoO6 octahedra from two Co3 trimers sustained by Keggin trivacant fragments held together by the bridge [CoW7O26(OH)2], which contains one tetrahedral CoO4 unit. The magnetic properties of the complex are discussed on the basis of the coexistence of ferro- and antiferromagnetic interactions and fitted according to an anisotropic exchange model in the low-temperature regime.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2004-03-19 | Inorganic Chemistry |