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首页> 外文期刊>Spectrochimica acta, Part A. Molecular and biomolecular spectroscopy >EPR spectra of Cu2+ and VO2+ ions in ammonium hydrogen oxalate hemihydrate [(NH4)HC2O4 center dot 1/2H(2)O single crystals
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EPR spectra of Cu2+ and VO2+ ions in ammonium hydrogen oxalate hemihydrate [(NH4)HC2O4 center dot 1/2H(2)O single crystals

机译:草酸氢铵半水合物[(NH4)HC2O4中心点1 / 2H(2)O单晶中Cu2 +和VO2 +离子的EPR谱

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摘要

Cu2+ and VO2+ doped ammonium hydrogen oxalate hemihydrate, [(NH4)HC2O4 center dot(1)/2H2O], single crystals have been studied at room temperature and at 113 K in three mutually perpendicular planes. Both ions yield unexpectedly large number of lines. The calculated results of the Cu2+ and VO2+ doped in [(NH4)HC2O4 center dot(1)/2H2O] indicate that both ions substitute with the NH4+ ion in the structure. The EPR spectra of Cu2+ ions are characteristic of tetragonally elongated octahedral site and the spectra of VO2+ are characteristic of tetragonally compressed complex. The angular variation of the EPR spectra has shown that two different Cu2+ and VO2+ complexes are located in different chemical environments, and each environment contains two magnetically inequivalent Cu2+ and VO2+ sites in distinct orientations occupying substitutional positions in the lattice and show very high angular dependence. The principal g and the hyperfine (A) values of both ions are determined. (c) 2005 Elsevier B.V. All rights reserved.
机译:Cu2 +和VO2 +掺杂草酸氢铵半水合物[[(NH4)HC2O4中心点(1)/ 2H2O],已经在室温和113 K的三个相互垂直的平面中研究了单晶。两种离子产生的行数出乎意料。掺杂在[(NH4)HC2O4中心点(1)/ 2H2O]中的Cu2 +和VO2 +的计算结果表明,两种离子均在结构中被NH4 +离子取代。 Cu2 +离子的EPR光谱是四边形八面体位点的特征,而VO2 +的光谱是四方压缩的络合物的特征。 EPR光谱的角度变化表明,两个不同的Cu2 +和VO2 +配合物位于不同的化学环境中,并且每个环境在不同的方向上包含两个磁不等价的Cu2 +和VO2 +位置,占据晶格中的置换位置,并显示出很高的角度依赖性。确定两个离子的主g和超精细(A)值。 (c)2005 Elsevier B.V.保留所有权利。

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