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• W1988342013 abstract "Abstract The tridentate 2‐ tert ‐butyl‐4‐methoxy‐6‐(quinolin‐8‐ylazo)phenol ligand HL has been synthesized and structurally characterized. Its redox activity has been investigated by electrochemical measurements and DFT calculations. Oxidation of HL (irreversible process) affords primarily a hydrogen‐bonded phenoxyl radical, whereas its reduction affords an iminosemiquinonate radical species. The reaction of two equivalents of HL with Zn(OAc) 2 affords the zinc complex Zn(L) 2 , which has been structurally characterized. Its oxidation is easier than that of HL and is reversible. The EPR spectrum of [Zn(L)(L · )] + shows an unresolved ( S = 1/2) signal at g = 2.005, while [Zn(L · )] 2+ exhibits spin triplet resonances (| D | = 0.0118 cm –1 and E / D = 0). The extra delocalization of spin density on the azo group contributes to a lowering of the D value relative to those of Schiff base derivatives. The temperature dependence of the EPR signal and DFT calculations reveal an excited state for the spin triplet and a weak exchange coupling constant J = –2.73 cm –1 ." @default.
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• W1988342013 date "2010-11-24" @default.
• W1988342013 modified "2023-10-16" @default.
• W1988342013 title "Radicals of Free and Zinc(II)‐Coordinated α‐Azophenols" @default.
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• W1988342013 doi "https://doi.org/10.1002/ejic.201001011" @default.
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