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Synthesis, structure, and heterogeneous catalytic activity of tungsten chalcogenide cubane cluster containing alkaline earth metal complex |
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| Authors: | Ji Young Kwon Youngmee Kim Sung-Jin Kim Sun Hwa Lee Han Kwak Cheal Kim |
| Institution: | aDepartment of Chemistry and Division of Nano Sciences, Ewha Womans University, Seoul 120-750, Republic of Korea bDepartment of Fine Chemistry, and Eco-Product and Materials Education Center, Seoul National University of Technology, Seoul 139-743, Republic of Korea |
| Abstract: | A new compound containing a cubane tungsten chalcogenide cluster W4(μ3-Te)4(CN)12]6? and Ca2+ complex units has been prepared by the reaction of aqueous solution of K6W4(μ3-Te)4(CN)12] · 5H2O with the solution of a Ca(NO3)2 and phen(1,10-phenanthroline) (1:2 molar ratio) in a solvent mixture of H2O/EtOH. The structure of {Ca(phen)2(H2O)}{Ca(phen)(H2O)4}{Ca(phen)2(H2O)3}]W4Te4(CN)12] · 5H2O 1 has been determined by X-ray crystallography. Compound 1 contains {Ca(phen)(H2O)4}{Ca(phen)2(H2O)3}]W4(μ3- Te)4(CN)12] units bridged by {Ca(phen)2(H2O)}2+ units to form an one-dimensional zigzag chain structure. Interestingly, compound 1 showed a heterogeneous catalytic activity in the transesterification of a range of esters with methanol under the mild conditions. Moreover, it can be reused without any loss of activity through 10 runs with ester. |
| Keywords: | K6[W4Te4(CN)12] · 5H2O Alkaline earth metal complex Heterogeneous catalytic activity Transesterification |
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