Uranium(IV) polyoxotungstophosphates |
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| Authors: | M Rusu Gh Marcu D Rusu C Roşu A-R Tomsa |
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| Institution: | (1) Chemistry Department, “Babeş-Bolyai” University, RO-3400 Cluj-Napoca, Romania;(2) Pharmacy Department, “Iuliu Haţieganu” University, RO-3400 Cluj-Napoca, Romania;(3) Inorganic Chemistry Department, Institut of Chemistry “Raluca Ripan”, RO-3400, Cluj-Napoca, Romania |
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| Abstract: | Two tris(oxouranium)-substituted Keggin and Dawson sandwich-type tungstophosphate heteropolyanions Na12(UO)3(H2O)6(PW9O34)2]·21 H2O (1) and Na18(UO)3(H2O)6(P2W15O56)2]·27 H2O (2) have been prepared by reaction of uranium sulphate with PW9O34]9− and P2W15O56]12−, respectively, in aqueous media at 4.7 pH. The products were characterized by elemental and thermal analyses, IR, UV-Vis
spectroscopy and magnetical susceptibility. The results of these studies suggest that the compounds obtained from Keggin and
Dawson trilacunary anions are 2∶3 sandwich-type complexes and both exhibit a square antiprismatic stereochemistry for uranium(IV)
with retention of polyoxometallate parent structure. |
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