TY - JOUR
T1 - A hexanuclear cobalt(II) cluster incorporated in a banana-shaped tungstovanadate
T2 - [(Co(OH2)Co2VW9O 34)2(VW6O26)]17-
AU - Lv, Hongjin
AU - Song, Jie
AU - Geletii, Yurii V.
AU - Guo, Weiwei
AU - Bacsa, John
AU - Hill, Craig L.
PY - 2013/4
Y1 - 2013/4
N2 - The hexanuclear cobalt-containing tungstovanadate complex, Na 17[(Co(OH2)Co2VW9O 34)2(VW6O26)]·31H 2O (1) has been synthesized through reaction of cobalt nitrate, sodium tungstate, and V2O5 in acetate buffer solution. The title compound has been characterized by X-ray crystallography, elemental analysis, FTIR, UV/Vis, and 51V NMR spectroscopy and by cyclic voltammetry. Complex 1 crystallizes in the monoclinic space group P2 1/c (a = 15.706(3) Å, b = 21.973(5) Å, c = 35.080(8) Å, α = 90°, β = 97.420(3)°, γ = 90°; V = 12005(5) Å3; Z = 4; based on 192337 independent reflections), which consists of two tri-CoII substituted B-α-[(Co(OH 2)Co2VW9O39)] Keggin units bridged by one unique [VW6O16] fragment leading to a banana-shaped structure with idealized C2ν symmetry. Stability studies show that polyoxoanion 1 ultimately transforms into the tetracobalt-containing sandwich-type polyoxoanion, 2, as confirmed by 51V NMR and X-ray crystallographic analyses. Polyoxoanion 1 shows catalytic activity for the H2O2-based epoxidation of 1-hexene and cyclohexene in 1,2-dichloroethane solvent.
AB - The hexanuclear cobalt-containing tungstovanadate complex, Na 17[(Co(OH2)Co2VW9O 34)2(VW6O26)]·31H 2O (1) has been synthesized through reaction of cobalt nitrate, sodium tungstate, and V2O5 in acetate buffer solution. The title compound has been characterized by X-ray crystallography, elemental analysis, FTIR, UV/Vis, and 51V NMR spectroscopy and by cyclic voltammetry. Complex 1 crystallizes in the monoclinic space group P2 1/c (a = 15.706(3) Å, b = 21.973(5) Å, c = 35.080(8) Å, α = 90°, β = 97.420(3)°, γ = 90°; V = 12005(5) Å3; Z = 4; based on 192337 independent reflections), which consists of two tri-CoII substituted B-α-[(Co(OH 2)Co2VW9O39)] Keggin units bridged by one unique [VW6O16] fragment leading to a banana-shaped structure with idealized C2ν symmetry. Stability studies show that polyoxoanion 1 ultimately transforms into the tetracobalt-containing sandwich-type polyoxoanion, 2, as confirmed by 51V NMR and X-ray crystallographic analyses. Polyoxoanion 1 shows catalytic activity for the H2O2-based epoxidation of 1-hexene and cyclohexene in 1,2-dichloroethane solvent.
KW - Cobalt
KW - Polyoxometalates
KW - Tungsten
KW - Vanadium
UR - http://www.scopus.com/inward/record.url?scp=84875650518&partnerID=8YFLogxK
U2 - 10.1002/ejic.201201130
DO - 10.1002/ejic.201201130
M3 - Article
AN - SCOPUS:84875650518
SN - 1434-1948
SP - 1720
EP - 1725
JO - European Journal of Inorganic Chemistry
JF - European Journal of Inorganic Chemistry
IS - 10-11
ER -