2002年7月
Structures and electronic properties of the catecholatoiron complexes in relation to catechol dioxygenases: chlorocatecholatoiron complexes are compared to the 3,5-di-tert-butylcatecholatoiron complex in the solid state and in solution
JOURNAL OF INORGANIC BIOCHEMISTRY
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- 巻
- 91
- 号
- 1
- 開始ページ
- 151
- 終了ページ
- 158
- 記述言語
- 英語
- 掲載種別
- 研究論文(学術雑誌)
- DOI
- 10.1016/S0162-0134(02)00375-6
- 出版者・発行元
- ELSEVIER SCIENCE INC
Chlorocatecholatoiron complexes, [Fe(TPA)(4Cl-Cat)]BPh4 and [Fe(TPA)(3Cl-Cat)]BPh4, (4Cl-Cat and 3Cl-Cat: 4- and 3-chloro-catecholates, respectively; TPA: tris(2-pyridylmethyl)amine) were isolated as intermediates for the oxygenative cleavage of chlorocatechols by nonheme iron complexes. Geometric structures of these complexes together with [Fe(TPA)(DTBC)]BPh4 (DTBC: 3,5-di-tert-butylcatecholate) as reference were analyzed by X-ray absorption spectroscopy (EXAFS) in the solid state and in solution. Structure of the DTBC complex in the solid state was shown to be noticeably different from the other complexes as seen in the magnetic susceptibility and spectroscopic data. Electronic and magnetic properties of these complexes were studied by X-ray absorption (XANES), electronic (VIS) and ESR spectroscopies, and magnetic susceptibility. Electron transfer from the catecholate ligand to the Fe(III) center was indicated by the Fe-K edge values in XANES spectra and by the LMCT bands in electronic spectra. Magnetic susceptibility and ESR data indicated that at low temperatures the complexes are in equilibrium between the low (S = 1/2) and high-spin (S = 5/2) ferric states with the latter component increasing with temperature. Remarkable differences between the spin states in solid and in solution were observed with the DTBC complex. (C) 2002 Elsevier Science Inc. All rights reserved.
- リンク情報
- ID情報
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- DOI : 10.1016/S0162-0134(02)00375-6
- ISSN : 0162-0134
- PubMed ID : 12121772
- Web of Science ID : WOS:000177141500018