The Synthesis and Characterization of the Tri-rhenium(VI) Capped Wells–Dawson Polyoxometalate, [{(C4H9)4N)5(C2H5)3NH}{Re3P2W15O62}] |
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Authors: | Alexander M Khenkin Gregory Leitus Lev Weiner Ronny Neumann |
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Institution: | 1. Department of Organic Chemistry, Weizmann Institute of Science, 76100, Rehovot, Israel 2. Chemical Research Support Unit, Weizmann Institute of Science, 76100, Rehovot, Israel
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Abstract: | The tri-rhenium(VI) capped Wells–Dawson polyoxometalate, Re3P2W15O62]6– with quaternary ammonium cations was synthesized by reacting the trivacant lacunary species, P2W15O56]12– with ReOCl3(PPh3)2] in an organic solvent. Elemental analysis by thermogravimetry and inductively coupled plasma mass spectroctrometry confirmed the substitution of three rhenium atoms, single-crystal X-ray diffraction as well as infra red spectroscopy showed the complete Wells–Dawson structure. The presence of all three rhenium atoms in one cap is indicated by 31P nuclear magnetic resonance spectroscopy and the electron spin resonance spectrum shows that the tri-rhenium(V) species with three unpaired electrons is low spin, S = ½. |
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