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首页> 外文期刊>New Journal of Chemistry >EPR study of the magnetic states of a mixed-valence (V4V2V)-V-IV alkoxypolyoxovanadium cluster
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EPR study of the magnetic states of a mixed-valence (V4V2V)-V-IV alkoxypolyoxovanadium cluster

机译:混合价(V4V2V)-V-IV烷氧基聚氧钒钒团簇的磁态的EPR研究

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摘要

The EPR studies of the hexanuclear vanadium cluster in a [(V4V2O7)-V-IV-O-V(OCH3)(12)] single crystal are reported. The spectrum of the mixed valence clusters consists of a single lorentzian line and additional signals in the magnetic field range similar to 240 - 440 mT and is observed in the 4.2 - 300 K temperature range. At about 190 K, on cooling, an abrupt change of the spectrum due to the structural phase transition, followed by a strong hysteresis, is discovered. Temperature dependence of the EPR spectra indicates an electron transfer between V-IV and V-V. Obtained results are discussed in the framework of the Heisenberg - Anderson - Zener Hamiltonian approach. The possibilities of other approaches is also considered.
机译:报道了[(V4V2O7)-V-IV-O-V(OCH3)(12)]单晶中六核钒簇的EPR研究。混合价簇的光谱由一条单一的洛伦兹线和在类似于240-440 mT的磁场范围内的附加信号组成,并在4.2-300 K的温度范围内观察到。在约190 K的温度下,冷却​​后,由于结构相变导致光谱突然变化,随后出现很强的磁滞现象。 EPR光谱的温度依赖性表明电子在V-IV和V-V之间转移。在Heisenberg-Anderson-Zener Hamiltonian方法的框架中讨论了获得的结果。还考虑了其​​他方法的可能性。

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