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    Please use this identifier to cite or link to this item: http://ir.lib.ncu.edu.tw/handle/987654321/60584


    Title: 合成及鑑定含有二茂鐵之不對稱鐵硫化合物以模擬氫化酵素之活化中心;Synthesis and Characterization of Biomimetic Asymmetric Iron Thiolate Complexes Containing Ferrocene Units Related to the Active Site of [FeFe]-hydrogenase
    Authors: 王虹茹;Wang,Hung-ju
    Contributors: 化學學系
    Keywords: 氫化酵素;鐵鐵;hydrogenase
    Date: 2013-07-03
    Issue Date: 2013-08-22 11:41:16 (UTC+8)
    Publisher: 國立中央大學
    Abstract: 本論文主要是在探討鐵-鐵氫化酵素,藉由化學合成的方法來模擬目前已知的氫化酵素結構,以及研究仿生酵素的功能性,在此合成一系列含有不同bridge head (配位基dithiolate)之結構不對稱雙鐵化合物[(m-xdt)Fe2(CO)4(PMe3)(PPh2Fc)] (xdt = edt (1),pdt (2),NH-adt (3),NnPr-adt (4),NBn-adt (5));配位基PMe3為electron-donor ligand,用於仿照在生物體中配位基CN-,而另一配位基PPh2Fc是一個redox-active ligand,用於仿照在生物體中[4Fe4S] ferredoxin-like-cluster。在整個研究中,藉由電化學分析化合物1-5的氧化還原特性,並藉由紅外線光譜儀偵測氧化反應,在此發現化合物1-5之第一個氧化電位皆為活性中心雙鐵之氧化,而後再分別探討當含有不同的配位基dithiolate化合物1以及3之其他氧化電位為何;藉由使用不同氧化劑來探討其氧化行為,當化合物1以及3在使用[(4-Br-C6H4)3N][SbCl6]作為氧化劑時,其氧化反應為兩個電子的氧化,且氧化劑的counter ion [SbCl6]-也會參與反應產生氯離子,故可得到氯離子配位之產物,反之當氧化劑為[(4-Br-C6H4)3N][BF4]時,其counter ion [BF4]-不參與反應。且由於化合物1以及3之配位基dithiolate不同時,會影響化合物氧化態的旋轉結構,導致氯離子以不同的方式配位,氯離子於化合物1採取末端配位可形成[(m-edt)(m-CO)Fe2(CO)3(PMe3)(PPh2Fc) (Cl)]+的結構,於化合物3則是採架橋方式之配位可形成[(m-NH-adt)(m-Cl)Fe2(CO)4(PMe3) (PPh2Fc)]+的結構。
    Using the strong electron-donor ligand PMe3 to replicate the function of ligand CN- in the enzyme, and the redox-active ligand PPh2Fc to replicate the function of [4Fe4S] ferredoxin-like-cluster. The synthesis, electrochemical characterization, NMR spectroscopy and X-ray single crystallography of a series of asymmetric diiron carbonyl dithiolate complexes, [(m-xdt)Fe2(CO)4(PMe3)(PPh2Fc)]
    xdt = edt (1), pdt (2), NH-adt (3), NnPr-adt (4) and NBn-adt (5) had been done in this work. The oxidation reactions of 1 and 3 by three different oxidants, FcBArF24, [(4-Br-C6H4)3N][BF4] and [(4-Br-C6H4)3N][SbCl6], were monitored by FT-IR. The Cl- adduct species ((m-CO)[1-Cl]+ and (m-Cl)[3]+) can be observed when using the oxidant [(4-Br-C6H4)3N][SbCl6] and were confirmed by Mass spectra and designed experiments.
    Appears in Collections:[Graduate Institute of Chemistry] Electronic Thesis & Dissertation

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