AMBIENTUM BIOETHICA BIOLOGIA CHEMIA DIGITALIA DRAMATICA EDUCATIO ARTIS GYMNAST. ENGINEERING EPHEMERIDES EUROPAEA GEOGRAPHIA GEOLOGIA HISTORIA HISTORIA ARTIUM INFORMATICA IURISPRUDENTIA MATHEMATICA MUSICA NEGOTIA OECONOMICA PHILOLOGIA PHILOSOPHIA PHYSICA POLITICA PSYCHOLOGIA-PAEDAGOGIA SOCIOLOGIA THEOLOGIA CATHOLICA THEOLOGIA CATHOLICA LATIN THEOLOGIA GR.-CATH. VARAD THEOLOGIA ORTHODOXA THEOLOGIA REF. TRANSYLVAN
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STUDIA CHEMIA - Ediţia nr.2 din 2009 | |||||||
Articol: |
SYNTHESIS AND CHARACTERIZATION OF A SANDWICH-TYPE CERIUM (IV) COMPLEX DERIVED FROM MONOLACUNARY DAWSON 2-MOLYBDO-15-TUNGSTO-2-PHOSPHATE. Autori: ADRIAN-RAUL TOMŞA, ANA-MARIA TODEA, DANIELA CIOLOBOC, LAURA MUREŞAN, MARIANA RUSU, VIOLETA PAŞCALĂU. |
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Rezumat: The reaction of monolacunary Dawson 2-molybdo-15-tungsto-2-phosphate, i.e. [1,2-P2Mo2W15O61]10- with Ce(SO4)2 in aqueous solution results in the formation of a new polyoxometalate complex, with the stoichiometry metal:ligand = 1:2. The new complex was isolated as potassium salt, i.e. K16[Ce(P2Mo2W15O61)2]•34H2O. The molecular formula was determined by elemental and thermogravimetric analysis. UV-Vis, FT-IR and 31P-NMR spectroscopy were used to characterize the new compound. Ion-exchange chromatography provided evidence for covalent, inner-sphere bonding of cerium (IV) to the monolacunary [1,2-P2Mo2W15O61]10- heteropolyoxometalate anion. The investigation results strongly suggest a sandwich-type structure with the cerium atom coordinated by two monolacunary Dawson anions. Keywords: polyoxometalate, heteropolyoxometalate, cerium, 2-molybdo-15-tungsto-2-phosphate, 31P-NMR |
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