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首页> 外文期刊>Dalton transactions: An international journal of inorganic chemistry >Isolation of EPR spectra and estimation of spin-states in two-component mixtures of paramagnets
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Isolation of EPR spectra and estimation of spin-states in two-component mixtures of paramagnets

机译:EPR谱的分离和旋转态在ParamAgnet的双组分混合物中的估计

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The presence of multiple paramagnetic species can lead to overlapping electron paramagnetic resonance (EPR) signals. This complication can be a critical obstacle for the use of EPR to unravel mechanisms and aid the understanding of earth abundant metal catalysis. Furthermore, redox or spin-crossover processes can result in the simultaneous presence of metal centres in different oxidation or spin states. In this contribution, pulse EPR experiments on model systems containing discrete mixtures of Cr(i) and Cr(iii) or Cu(ii) and Mn(ii) complexes demonstrate the feasibility of the separation of the EPR spectra of these species by inversion recovery filters and the identification of the relevant spin states by transient nutation experiments. We demonstrate the isolation of component spectra and identification of spin states in a mixture of catalyst precursors. The usefulness of the approach is emphasised by monitoring the fate of the chromium species upon activation of an industrially used precatalyst system.
机译:多个顺磁性物质的存在可以导致重叠的电子顺笔谐振(EPR)信号。这种并发症可能是使用EPR到解开机制的关键障碍,并帮助理解地球丰富的金属催化。此外,氧化还原或旋转交叉过程可导致在不同氧化或旋转状态下同时存在金属中心。在这一贡献中,脉冲EPR关于Cr(I)和Cr(III)和Cr(III)和Cu(II)和Cu(II)和Mn(II)复合物的分立混合物的模型系统实验证明了通过反转恢复分离这些物种的EPR光谱的可行性通过瞬态应答实验滤波器和相关旋转状态的鉴定。我们证明了组分光谱的分离和催化剂前体的混合物中的旋转状态的鉴定。通过监测在工业用过的预催化体系激活时,通过监测铬物种的命运来强调该方法的有用性。

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