Functional model for intradiol-cleaving catechol 1,2-dioxygenase: Synthesis, structure, spectra, and catalytic activity of iron(III) complexes with substituted salicylaldimine ligands

doi:10.1016/j.ica.2007.02.034

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Title:	Functional model for intradiol-cleaving catechol 1,2-dioxygenase: Synthesis, structure, spectra, and catalytic activity of iron(III) complexes with substituted salicylaldimine ligands
Authors:	魏和祥;Wei, Ho-hsiang;Wang, Chi-hueng;Lu, Jian-wei;Takeda, Masuo
Contributors:	淡江大學化學學系
Keywords:	Non-heme iron protein;Model of catechol 1,2-dioxygenase;Mononuclear iron(III) complexes;Salicylaldimine;Crystal structure;Mössbauer effect;Model of catechol 1,2-dioxygenase
Date:	2007-06-10
Issue Date:	2009-12-01
Publisher:	Elsevier
Abstract:	A series of mononuclear iron(III) complexes with containing phenolate donor of substituted-salicylaldimine based ligands [Fe(L1)(TCC)] · CH3OH (1), [Fe(L2)(TCC)] · CH3OH (2), [Fe(L3)(TCC)] (3), and [Fe(L4)(TCC)] (4) have been prepared and studied as functional models for catechol dioxygenases (H2TCC = tetrachlorocatechol, or HL1 = N′-(salicylaldimine)-N,N-diethyldiethylenetriamine, HL2 = N′-(5-Br-salicylaldimine)-N,N-diethyldiethylenetriamine, HL3 = N′-(4,6-dimethoxy-salycyl-aldimine)-N,N-diethyl-diethylenetriamine, HL4 = N′-(4-methoxy-salicylaldimine)-N,N-diethyl-diethylenetriamine). They are structural models for inhibitors of enzyme-substrate adducts from the reactions of catechol 1,2-dioxygenases. Complexes 1–4 were characterized by spectroscopic methods and X-ray crystal structural analysis. The coordination sphere of Fe(III) atom of 1–4 is distorted octahedral with N3O3 donor set from the ligand and the substrate TCC occupying cis position, and Fe(III) is in high-spin (S = 5/2) electronic ground state. The in situ prepared iron(III) complexes without TCC, [Fe(L1)Cl2], [Fe(L2)Cl2], [Fe(L3)Cl2], and [Fe(L4)Cl2] are reactive towards intradiol cleavage of the 3,5-di-tert-butylcatechol (H2DBC) in the presence of O2 or air. The reaction rate of catechol 1,2-dioxygenase depends on the redox potential and acidity of iron(III) ions in complexes as well as the substituent effect of the ligands. We have identified the reaction products and proposed the mechanism of the reactions of these iron(III) complexes with H2DBC with O2.
Relation:	Inorganica Chimica Acta 360(9), pp.2944-2952
DOI:	10.1016/j.ica.2007.02.034
Appears in Collections:	[Graduate Institute & Department of Chemistry] Journal Article

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