Manganese Mono-Substituted Borotungstate: Characterization and Catalytic Application

abstract

The Keggin-type TBA(4)H(2)[BW11Mn(H2O)O-39]center dot H2O (BW11Mn) compound was isolated and characterized. The first sphere of coordination for the manganese atom was determined by EXAFS analysis. Six oxygen atoms were found in the range of 1.80-2.64 angstrom from the manganese. BW11Mn showed to be an active, efficient and selective catalyst for cis-cyclooctene (la) epoxidation in the presence of stoichiometric quantities of H2O2. After 5 h of reaction almost complete conversion was achieved (86% of conversion). Selectivity was always 100 % for the epoxide.

keywords

KEGGIN-TYPE POLYOXOTUNGSTATES; METAL SUBSTITUTED POLYOXOTUNGSTATES; HIGH-VALENT MANGANESE; HYDROGEN-PEROXIDE; OXIDATION

subject category

Materials Science

authors

Balula, SS; Santos, ICMS; Barbosa, ADS; Schlindwein, W; Cavaleiro, AMV; de Castro, B; Cunha-Silva, L

our authors

acknowledgements

The authors acknowledge the Fundacao para a Ciencia e a Tecnologia (FCT, MEC, Portugal) for general funding by strategic projects (PEst C/EQB/LA0006/2011 for Associated Laboratory REQUIMTE and PEst-C/QUI/UI0062/2011 for QOPNA) and by the R&D project PTDC/EQUEQU/121677/2010.

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