Functional model for catecholase-like activity: Synthesis, structure, spectra, and catalytic activity of iron(III) complexes with substituted-salicylaldimine ligands |
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Authors: | Shun-I Lo Wei-Ju Chen Ho-Hsiang Wei Motomi Katada |
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Institution: | a Department of Chemistry, Tamkang University, 151 Ying-Chung Road, Tamsui 25137, Taiwan b Graduate School of Science, Tokyo Metropolitan University, Minami-ohsawa, Hachioji, Tokyo 192-0397, Japan |
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Abstract: | Four new mononuclear iron(III) complexes with the substituted-salicylaldimine ligands, Fe(L1)(TCC)] (1), Fe(L2)(TBC)] (2), Fe(L3)(TBC)] (3) and Fe(L4)(TCC)](CH3CN) (4) (HL1 = N′-(5-OH-salicylaldimine)-diethylenetriamine, HL2 = (N′-(5-Cl-salicylaldimine)-diethylenetriamine, HL3 N′-(5-Br-salicyl-aldimine)-dipropylenetriamine, HL4 = (N′-3,5-Br-salicylaldimine)-dipropylenetriamine, H2TCC = tetrachlorocatechol, and H2TBC = tetrabromocatechol), were prepared and characterized by XRD, EPR, and Mössbauer spectroscopy. The coordination sphere of the Fe(III) in complexes 1-4 is a distorted octahedral with N3O3 donors set which constructed by the Schiff-base ligands and the catecholate substrates of TBC or TCC. The in situ prepared Fe(III) complexes Fe(L1)Cl2], Fe(L2)Cl2], Fe(L3)(Cl2)], and Fe(L4)Cl2] in absence of TBC or TCC show a high catecholase-like activity for the oxidation of 3,5-DTBC to the corresponding quinone 3,5-DTBQ. |
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Keywords: | Model of catechol oxidase Mononuclear iron(III) complexes Salicylaldimine Crystal structure Mö ssbauer effect |
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