Paper Title:
Catalytic Performance of Copper-Substituted Polyoxotungstate Materials and X-Ray Structure of a New Sandwich-Type Compound
  Abstract

Mono-substituted and sandwich-type copper substituted polyoxoanions ([PW11CuO39]5− and [Cu4(H2O)2(PW9O34)2]10−) were studied as catalysts for the epoxidation of cyclooctene and geraniol, using the green oxidant H2O2, with the results suggesting good efficiency at room temperature. High selectivity and reasonable conversion data were found after the first minutes of reaction. The copper centre may be responsible for this performance and our on-going research focuses in the preparation of new materials incorporating copper into polyoxometalates (POMs). In this context, we have also isolated a new crystalline dimeric sandwich-type polyoxocoppertungstate {H7.05[Cu3WO(H2O)(CuW9O34)(Cu0.6W9O34)]}7.75−. This compound was isolated as potassium salt and structurally characterized by FTIR and single-crystal X-ray diffraction (XRD). The polyoxoanion is composed by the [CuW9O34]12− and [Cu0.6W9O34]12.8− anionic fragments, joined together by a rhomb-like arrangement of three Cu2+ and one W6+ metallic centres, all exhibiting octahedral coordination geometries.

  Info
Periodical
Materials Science Forum (Volumes 587-588)
Edited by
António Torres Marques, António Fernando Silva, António Paulo Monteiro Baptista, Carlos Sá, Fernando Jorge Lino Alves, Luís Filipe Malheiros and Manuel Vieira
Pages
538-542
DOI
10.4028/www.scientific.net/MSF.587-588.538
Citation
S. S. Balula, L. Cunha-Silva, I. C.M.S. Santos, F. A. A. Paz, J. Rocha, H. I.S. Nogueira, A. M.V. Cavaleiro, "Catalytic Performance of Copper-Substituted Polyoxotungstate Materials and X-Ray Structure of a New Sandwich-Type Compound", Materials Science Forum, Vols. 587-588, pp. 538-542, 2008
Online since
June 2008
Export
Price
$32.00
Share

In order to see related information, you need to Login.

In order to see related information, you need to Login.

Authors: Filipa L. Sousa, Paula C.R. Soares-Santos, Helena I.S. Nogueira, Rute A. Sá Ferreira, Ana M.V. Cavaleiro, Luís D. Carlos, Tito Trindade
Abstract:A layer-by-layer assembly method was employed to fabricate multilayered films containing the terbium heteropolyanions...
1135
Authors: M.Salete S. Balula, Helena I.S. Nogueira, Ana M.V. Cavaleiro
Abstract:New lanthanotungstocobaltates with the Keggin structure and general formula KxHy[Ln(CoW11O39)(H2O)3]⋅nH2O or...
1206
Authors: Manuela J.E. Rodrigues, Filipe A. Almeida Paz, Rute A. Sá Ferreira, Luís D. Carlos, Helena I.S. Nogueira
Abstract:Novel polynuclear tungsten and molybdenum (VI) complexes with 3-hydroxypicolinic acid (HpicOH) and europium(III) [M4O12Eu(picOH)3] (M(VI) =...
1305
Authors: Salete S. Balula, Isabel C.M.S. Santos, André D.S. Barbosa, Walkiria Schlindwein, Ana M.V. Cavaleiro, Baltazar de Castro, Luís Cunha-Silva
Chapter 10: Polymers
Abstract:The Keggin-type TBA4H2[BW11Mn(H2O)O39].H2O (BW11Mn) compound was...
975
Authors: Dun Jia Wang, Yan Fang Kang, Ben Po Xu
Chapter 8: Materials Physics and Chemistry
Abstract:The polyoxometalate complexes of ciprofloxacin with HnXW12O40 (X=B, Si, P) were prepared from ciprofloxacin...
1075