Possibility of Dielectric Material: Magnetic Resonance Study of Oxo-Bridged Dinuclear Ruthenium Mixed-Valence Complex
Possibility of Dielectric Material: Magnetic Resonance Study of Oxo-Bridged Dinuclear Ruthenium Mixed-Valence Complex
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介电材料的可能性：氧桥双核钌混价络合物的磁共振研究
DOI：
10.1002/slct.201802617
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发表时间：
2018
期刊：
影响因子：
2.1
通讯作者：
Masaoka Shigeyuki
中科院分区：
文献类型：
--
作者：
Nakamura Toshikazu;Asada Mizue;Yoshida Masaki;Kondo Mio;Masaoka Shigeyuki
对氧桥双核钌[RuORu]5+(Ru3.5+ORu3.5+)混合价配合物进行了固态宽线1H-NMR（核磁共振）和ESR（电子自旋共振）分析。 1H-NMR自旋晶格弛豫率T1−1显着增强，低于100 K，峰值约为33 K。T1−1峰值温度与频率无关，表明这种异常可能是相变。低于约 40 K，1H-NMR 自旋-自旋弛豫时间 T2 突然减小，提供了不等 1H 位点出现的证据（对称性突然减小）。 ESR 谱在 35 K 以上突然消失。从微观角度讨论了这种混合价化合物的电子特性和可能的电荷有序 (Ru3+ORu4+) 态。
Solid‐state broad line1H‐NMR (nuclear magnetic resonance) and ESR (electron spin resonance) were performed for an oxo‐bridged dinuclear ruthenium[RuORu]5+(Ru3.5+ORu3.5+) mixed‐valence complex. The1H‐NMR spin‐lattice relaxation rateT1−1was significantly enhanced, to below 100 K with a peak at approximately 33 K. TheT1−1peak temperature was frequency‐independent, indicating that this anomaly is a possible phase transition. Below approximately 40 K, an abrupt decrease of1H‐NMR spin‐spin relaxation timeT2provides evidence of the appearance of inequivalent1H‐sites (sudden decrease in symmetry). ESR spectra suddenly disappeared above 35 K. The electronic properties and possible charge ordering (Ru3+ORu4+) states in this mixed‐valence compound are discussed from a microscopic point of view.