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- W2020860121 abstract "The bis-bidentate bridging function of gbha2- with N,O-/N,O- coordination was observed for the first time in the complex (μ-gbha)[RuIII(acac)2]2 (1). Density functional theory calculations of 1 yield a triplet ground state with a large (ΔE > 6000 cm-1) singlet−triplet gap. Intermolecular antiferromagnetic coupling was observed (J ≈ −5.3 cm-1) for the solid. Complex 1 undergoes two one-electron reduction and two one-electron oxidation steps; the five redox forms {(μ-gbha)[Ru(acac)2]2}n (n = −2, −1, 0, +1, +2) were characterized by UV−vis−NIR spectroelectrochemistry (NIR = near infrared). The paramagnetic intermediates were also investigated by electron paramagnetic resonance (EPR) spectroscopy. The monoanion with a comproportionation constant Kc of 2.7 × 108 does not exhibit an NIR band for a RuIII/RuII mixed-valent situation; it is best described as a 1,4-diazabutadiene radical anion containing ligand gbha•3-, which binds two ruthenium(III) centers. A RuIII-type EPR spectrum with g1 = 2.27, g2 = 2.21, and g3 = 1.73 is observed as a result of antiferromagnetic coupling between one RuIII and the ligand radical. The EPR-active monocation (Kc = 1.7 × 106) exhibits a broad (Δν1/2 = 2600 cm-1) intervalence charge-transfer band at 1800 nm, indicating a valence-averaged (Ru3.5)2 formulation (class III) with a tendency toward class II (borderline situation)." @default.
- W2020860121 created "2016-06-24" @default.
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- W2020860121 date "2005-10-19" @default.
- W2020860121 modified "2023-10-16" @default.
- W2020860121 title "A New Coordination Mode of the Photometric Reagent Glyoxalbis(2-hydroxyanil) (H<sub>2</sub>gbha): Bis-Bidentate Bridging by gbha<sup>2</sup><sup>-</sup> in the Redox Series {(μ-gbha)[Ru(acac)<sub>2</sub>]<sub>2</sub>}<i><sup>n</sup></i> (<i>n</i> = −2, −1, 0, +1, +2), Including a Radical-Bridged Diruthenium(III) and a Ru<sup>III</sup>/Ru<sup>IV</sup> Intermediate" @default.
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- W2020860121 doi "https://doi.org/10.1021/ic050950r" @default.
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