Abstract
The gadolinium-sandwiched complexes with polyoxometalates: [GdW10O36]9−, [Gd(SiW11O39)]13− and [Gd(SiW11−xMoxO39)2]13− (where x=2, 5, 8) have been chosen for electron paramagnetic resonance (EPR) study. The EPR spectra obtained for the ‘pure’ Gd(III) compounds (not doped) markedly differ from the U-spectrum characteristic for Gd(III) in glasses. This report shows how some of the spectroscopic properties of lanthanide(III) complexes can be studied with EPR through examples of Gd3+ ion interactions with polyoxometalates. Analysis of EPR spectra obtained at X- (9.4 GHz) and Q- (35 GHz) bands provide estimates of zero-field splitting (ZFS) parameter D, a linewidth of the central line and effective g-factors for particular EPR lines. An interesting pattern showing a linear dependence of the D-value on the content of number x of Mo atoms, in the [Gd(SiW11−xMoxO39)2]13− structure, was obtained and an attempt to explain it was made.
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