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Title of Journal: Appl Magn Reson

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Abbravation: Applied Magnetic Resonance

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Springer Vienna

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ISSN

1613-7507

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Influence of Compression on Magnetic Properties of

Authors: A S Berezin V A Nadolinny L G Lavrenova
Publish Date: 2016/05/20
Volume: 47, Issue: 7, Pages: 745-756
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Abstract

This study devotes the influence of uniaxial compression on electron paramagnetic resonance EPR spectra of a polycrystalline coordination compound of nickel chloride with 3amino4ethoxycarbonylpyrazole L After exposure to uniaxial compression approximately 3  of the compound was shown to turn into a new state characterized by the singlet ground state The gap between highlying triplet state and the ground state is 0018 eV that ensures the former is populated at room temperature according to the Boltzmann distribution The EPR parameters for the nickel containing centers in the triplet state at room temperature were calculated g  = 2181 g ⊥ = 2172 D = 1300100 G and E = 0 There are two assumptions about the nature of these centers First the influence of uniaxial compression is supposed to lead to a tetrahedral distortion of the octahedral environment of nickel ions Second the formation of the dimer nickel containing center is due to closing the terminal groups of the nearest polymer chains

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