Abstract
AbstractSolid‐state broad line 1H‐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. The 1H‐NMR spin‐lattice relaxation rate T1−1 was significantly enhanced, to below 100 K with a peak at approximately 33 K. The T1−1 peak temperature was frequency‐independent, indicating that this anomaly is a possible phase transition. Below approximately 40 K, an abrupt decrease of 1H‐NMR spin‐spin relaxation time T2 provides evidence of the appearance of inequivalent 1H‐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.
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