Strong influence of structures around aluminum centers constructed in polyoxotungstates for catalytic oxidation of alcohols with dioxygen in water

Authors: Chika Nozaki Kato, Masaru Nagami, Nami Ukai

Abstract:
Water-soluble aluminum-coordinated polyoxotungstates, Cs₄[-PW11{Al(OH2)}O₃₉]·8H₂O (Cs-1), [(CH₃)₄N]₄[-PW₁₁{Al(OH₂)}O₃₉]·8H₂O (TMA-1),K₆Na[(A-PW₉O₃₄)2{W(OH)(OH2)}{Al(OH)(OH₂)}{Al(- OH)(OH₂)₂}₂]·19H₂O (KNa-2), and K₇[2-P₂W₁₇{Al(OH₂)}O₆₁]·14H₂O (K-3), were used as homogeneous catalysts or catalyst precursors for the oxidation of alcohols with 1 atm molecular oxygen in a water–alcohol biphasic medium. The catalytic activities and the stabilities of polyoxoanions were significantly affected by the structures around the aluminum sites constructed in the polyoxotungstates. In particular, polyoxoanion 1 exhibited high turnover numbers and high selectivities of the corresponding carbonyl products, and the molecular structure of 1 was remarkably stable for oxidations with long time intervals.

Keywords:
Aluminum complex
Polyoxometalate
Alcohol oxidation
Molecular oxygen
Water

Published in: Applied catalysis A: General  (Volume 452, Pages 1-222, 15 February 2013)

Publisher: Elsevier

ISSN Information: 0926-860X

Strong influence of structures around aluminum centers constructed in polyoxotungstates for catalytic oxidation of alcohols with dioxygen in water

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