教師資料查詢 | 類別: 期刊論文 | 教師: 謝忠宏 HSIEH, CHUNG-HUNG (瀏覽個人網頁)

標題:Photochemistry of the Dinitrosyl Iron Complex [S5Fe(NO)2]- Leading to Reversible Formation of [S5Fe(μ-S)2FeS5]2-: Spectroscopic Characterization of Species Relevant to the Nitric Oxide Modification and Repair of [2Fe−2S] Ferredoxins
學年93
學期1
出版(發表)日期2004/08/01
作品名稱Photochemistry of the Dinitrosyl Iron Complex [S5Fe(NO)2]- Leading to Reversible Formation of [S5Fe(μ-S)2FeS5]2-: Spectroscopic Characterization of Species Relevant to the Nitric Oxide Modification and Repair of [2Fe−2S] Ferredoxins
作品名稱(其他語言)
著者Tsai, Ming-Li; Chen, Chiao-Chun; Hsu, I-Jui; Ke, Shyue-Chu; Hsieh, Chung-Hung; Chiang, Kuo-An; Lee, Gene-Hsiang; Wang, Yu; Chen, Jin-Ming; Lee, Jyh-Fu; Liaw, Wen-Feng
單位淡江大學化學學系
出版者Washington, DC: American Chemical Society
著錄名稱、卷期、頁數Inorganic Chemistry 43(16), pp.5159-5167
摘要The reaction of [PPN][Fe(CO)3(NO)] and S8 in a 1:1 molar ratio in THF proceeded to give the dinitrosyl iron complex [PPN][S5Fe(NO)2] (1) and the known [PPN]2[S5Fe(μ-S)2FeS5] (2). EPR signals of g values gz = 2.0148, gx = 2.0270, and gy = 2.0485 at 77 K confirmed the existence of the unpaired electron in compound 1. The temperature-dependent magnetic moment of complex 1 indicates that the ground state is one unpaired electron with (St, SL) = (1/2, 1) at very low temperature (St is the total spin quantum number of the system; SL is the sum of the spin quantum numbers of two NO ligands). The O K-edge absorptions of complex 1 and [(NO)Fe(S2CNEt2)2] at 532.1 and 532.5 eV are assigned to the transition of 1s → π*(NO) and 1s → π*(NO+), respectively. For the electronic structure of the {Fe(NO)2} core, DFT calculations, magnetic susceptibility measurement, EPR, and Fe K-/L-edge XAS spectroscopy of complex 1 lead to a description of {Fe1+(•NO)2}9. [2Fe−2S] cluster 2 treated with nitric oxide in THF shows that cluster 2 is transformed into the dinitrosyl iron complex 1 identified by IR, UV−vis, and X-ray diffraction analysis. The reaction may be reversed by the photolysis of the THF solution of 1 in the presence of the NO-accepting reagent [(C4H8O)Fe(S,S-C6H4)2]- to reform 2. This result demonstrates a successful biomimetic reaction cycle of the degradation and reassembly of [2Fe−2S] cluster [S5Fe(μ-S)2FeS5]2- relevant to the repair of nitric oxide-modified [2Fe−2S] ferredoxin by cysteine desulfurase and l-cysteine in vitro.
關鍵字
語言英文
ISSN0020-1669;1520-510X
期刊性質國外
收錄於
產學合作
通訊作者
審稿制度
國別美國
公開徵稿
出版型式紙本;電子版
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