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Possibility of Dielectric Material: Magnetic Resonance Study of Oxo‐Bridged Dinuclear Ruthenium Mixed‐Valence Complex
Author(s) -
Nakamura Toshikazu,
Asada Mizue,
Yoshida Masaki,
Kondo Mio,
Masaoka Shigeyuki
Publication year - 2018
Publication title -
chemistryselect
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.437
H-Index - 34
ISSN - 2365-6549
DOI - 10.1002/slct.201802617
Subject(s) - ruthenium , valence (chemistry) , electron paramagnetic resonance , chemistry , spectral line , crystallography , relaxation (psychology) , condensed matter physics , nuclear magnetic resonance , ruthenium oxide , nmr spectra database , spin–lattice relaxation , nuclear quadrupole resonance , physics , psychology , social psychology , biochemistry , organic chemistry , astronomy , catalysis
Solid‐state broad line 1 H‐NMR (nuclear magnetic resonance) and ESR (electron spin resonance) were performed for an oxo‐bridged dinuclear ruthenium [RuORu] 5+ (Ru 3.5+ ORu 3.5+ ) mixed‐valence complex. The 1 H‐NMR spin‐lattice relaxation rate T 1 −1 was significantly enhanced, to below 100 K with a peak at approximately 33 K. The T 1 −1 peak temperature was frequency‐independent, indicating that this anomaly is a possible phase transition. Below approximately 40 K, an abrupt decrease of 1 H‐NMR spin‐spin relaxation time T 2 provides evidence of the appearance of inequivalent 1 H‐sites (sudden decrease in symmetry). ESR spectra suddenly disappeared above 35 K. The electronic properties and possible charge ordering (Ru 3+ ORu 4+ ) states in this mixed‐valence compound are discussed from a microscopic point of view.