Epr study of some copper(II) mononuclear and copper(II)-copper(II)/ copper(II)nickel(II) binuclear complexes
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New thermally detected electron paramagnetic resonance (TD-EPR) experiments at 35 GHz including photoinduced effects, are described. The resonances are attributed to a V2+ (II) centre with a 4T1 ground state as before. In order to attempt to identify the nature of the centre, a trigonal model is presented which supposes that the V2+ ion is part of a complex in which one of the neighbouring As ions is replaced by a defect. It is shown that the TD-EPR results are consistent with such a model but this does not prove by itself that the V2+(II) ion is part of a complex. Other experimental results obtained by other techniques are also discussed and related to the TD-EPR data obtained here. After consideration of all the available data, the most probable conclusion is that V2+ (II) is part of a complex.
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The electron paramagnetic resonance (EPR) spectra of Cu2+-doped RbH2 PO4 at elevated temperatures indicate a phase transition at 358 K. The EPR-silent state at this temperature is attributed to a so-called polymeric phase transition. After the transition when the temperature is lowered to 293 K, the EPR signal does not appear; therefore, the transition is irreversible. This result seems to be in agreement with the other observations. The EPR spectra for the sample indicate the presence of two sites for Cu2+, and the values of EPR parameters are in accord with the literature on Cu2+-doped single crystals. Any other phase transitions could not to be observed at low temperatures down to 113 K.
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