PELDOR and RIDME Measurements on a High-Spin Manganese(II) Bisnitroxide Model Complex
PELDOR and RIDME Measurements on a High-Spin Manganese(II) Bisnitroxide Model Complex
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DOI：
10.1021/acs.jpca.6b00716
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发表时间：
2016-05-26
影响因子：
2.9
通讯作者：
Schiemann, Olav
中科院分区：
文献类型：
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作者：
Meyer, Andreas;Schiemann, Olav
合成了锰 (II) 的均配二硝基氧配合物，作为涉及高自旋金属离子和多个距离的 EPR 光谱距离测定的模型系统。将 RIDME 实验的性能与更常用的 PELDOR 实验进行比较。结果表明，PELDOR 实验产生了 Mn(II)-硝基氧和硝基氧硝基氧这两种距离，并且它们可以在一定程度上分离，而 RIDME 实验仅产生 Mn(II) 硝基氧距离。由于多自旋效应或更高的电子自旋跃迁，两个脉冲序列都会产生伪影。方向选择主要由硝基氧信号引入，并且可以通过 RIDME 实验中观察者视野的变化来平均。因此，这两种方法可以互补使用以获得未知系统的可靠图像。
A homoleptic bisnitroxide complex of manganese(II) was synthesized as a model system for EPR spectroscopic distance determinations involving high-spin metal ions and more than one distance. The performance of the RIDME experiment is compared with that of the more frequently used PELDOR experiment. It is shown that the PELDOR experiment yields both distances, Mn(II)-nitroxide and nitroxide nitroxide, and that they can be separated to a certain extent, whereas the RIDME experiment yields only the Mn(II) nitroxide distance. Both pulse sequences yield artifacts, either due to multispin effects or higher electron-spin transitions. Orientation selection is mostly introduced by the nitroxide signal and can be averaged out by variation of the observer field in the RIDME experiment. Thus, both methods might be used complementarily to obtain a reliable picture of an unknown system.