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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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The STUDIA UNIVERSITATIS BABEŞ-BOLYAI issue article summary The summary of the selected article appears at the bottom of the page. In order to get back to the contents of the issue this article belongs to you have to access the link from the title. In order to see all the articles of the archive which have as author/co-author one of the authors mentioned below, you have to access the link from the author's name. |
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STUDIA PHYSICA - Issue no. Sp. Issue / 2003 | |||||||
Article: |
EPR STUDY OF TWO SANDWICH-TYPE HETEROPOLYOXOMETALATES WITH TRINUCLEAR VANADIUM CLUSTERS (VIV3 AND VIV2VV). Authors: L. DAVID, O. COZAR, VASILE CHIŞ. |
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Abstract: The sandwich-type K12[(VO)3(BiW9O33)2]31H2O (1) and K11[(VO)3(BiW9O33)2]21H2O (2) heteropolyoxotungstates were investigated by means of EPR spectroscopy. The powder EPR spectrum of the complex 1 obtained at room temperature was simulated as a superposition of one axial component with gII = 1.899, g = 1.974, AII = 184 G and A = 69 G for the S = 1/2 ground state of the VIV3 cluster and a broad component ( 500 G) with giso = 1.974 for the excited S = 3/2 state and accounting for a combined effect of unresolved g and A anisotropies and VV dipolar coupling. The powder spectrum of the complex 2 presents the same features, but with the EPR parameters: gII = 1.908, g = 1.968, AII = 186 G, A = 60 G for the axial component and giso = 1.968, Biso = 500 G for the isotropic component. | |||||||
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