EPR study of selected gadolinium β-diketonates

Szyczewski, A.; Krzyminiewski, Ryszard; Pietrzak, J.; Kurzynski, Z.; Lis, Stefan; Elbanowski, M.

doi:10.1007/bf02606662

Cited by 5 publications

(7 citation statements)

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“…The EPR spectrum recorded for the gadolinium sandwich complex (Fig. 2) Table. Comparison of the EPR spectra recorded for gadolinium-polyoxometalates with those recently published b y us for ß-diketonates [2] and polycarboxylates [3] leads us to the following conclusions:…”

Section: Results Acid Discussionsupporting

confidence: 55%

“…The g-values < 2.0 are almost similar, and only the small di fferences are observed for g > 2.0. On the basis of this similarity and taking into account the spin-Hamiltonian calculations by Nicklin et al [12] (like in our previous papers [2,3]), it is possible to suppose the existence of the Gd3+ ion in two different surroundings: in a strong crystal field of rhombic symmetry and in a weak crystal fueld.…”

Section: Results Acid Discussionmentioning

confidence: 75%

“…In the case of the Gd(acac)3 .3H2O complex a rhombic distortion (related to the presence of the third water molecule) [2] was observed, which was associated with a shift of the line of g = 2.60 value (for the Gd(BΑC)3.2H2O complex) to the value of g = 2.99 (for the Gd(acac)3.3H2O complex). Since the EPR spectrum of the complex [GdP5W30O110]12-is quite similar to that of Gd(acac)3 • 3H2O the presence of the lines cIaracteristic of complexes of gadolinium having three water molecules in the inner coordination sphere of metal, i.e.…”

Section: Results Acid Discussionmentioning

confidence: 93%

“…Using the RKU computer program we could enhance the spectra resolution [15], make it possible to observe the fine structure of the powder spectra of gadolinium β-diketonates [2] and polycarboxylates [3]. The examples of the EPR spectra obtained for the Gd(ΤΤA)3.2H2O complex, before and after the computer processing, are presented in 1.1g.…”

Section: Results Acid Discussionmentioning

confidence: 99%

“…The EPR study of the Gd3+ ion concerned only metal salts in which Gd has been introduced as dopant (< 1%) into crystals. In our previous papers the EPR method was used for the first time to study the pure gadolinium complexes [2,3]. Because of the strong spin-spin interactions the EPR spectra obtained for such compounds were very broad and no details were possible to observe.…”

Section: Introductionmentioning

confidence: 99%

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EPR Study of Gadolinium(III) Complexes with Heteropolyanions: [Gd(SiW₁₁O₃₉)₂]^13-and [GdP₅W₃₀O₁₁₀]^12-

et al. 1996

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[II] have been chosen for EPR study. This study is a continuation of our recent investigation related to solid gadolinium complexes: β-diketonates and aminopolycarboxylates. The EPR spectra of the Gd-polyoxometalates studied provide much better resolution than those recently studied. The spectra of Gd-polyoxometalates containing 1.7 to 2.5% of Gd(HI) do not require an additional computer processinng for correct interpretation. It is on tle contrary to the β-diketonates and polyamieocarboxylates (witl the content of Gd(III) 22-33%) for which the use of the RKU computer program (based on Fourier transform) was necessary in .order to enhance the spectra resolution thus improving their correct interpretation. Tle EPR spectra obtained for the compounds Ι and II markedly differ from the U-spectrum characteristic of Gd(HI) in glasses. Taking into account the spin-Hamiltonian calculations the existence of Gd(III) ion in two different surroundings: in a strong crystal freld of rhombic symmetry and in a weak crystal field, is observed. The differences observed between the case I and II seem to be related to a various hydration degree.

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Section: Results Acid Discussionsupporting

confidence: 55%