CO2‐Aktivierung an Übergangsmetallzentren: Simulation enzymatischer CO2‐Fixierungs‐ und Transferreaktionen durch elektronenreiche (Diazadien)magnesium‐ und ‐mangan‐Komplexe
CO2‐Aktivierung an Übergangsmetallzentren: Simulation enzymatischer CO2‐Fixierungs‐ und Transferreaktionen durch elektronenreiche (Diazadien)magnesium‐ und ‐mangan‐Komplexe
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CO2-Aktivierung an Übergangsmetalzentren:模拟酶 CO2-Fixierungs- 和 Transferreaktionen durch elektronenreiche (Diazadien)magnesium- und -mangan-Komplexe
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发表时间:
1992
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通讯作者:
J. Sieler
中科院分区:
文献类型:
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作者:
D. Walther;U. Ritter;Zzbernd Undeutsch;R. Kempe;J. Sieler
Activation of CO2 at Transition-Metal Centres: Simulation of Enzymatic CO2 Fixation and Transfer Reactions by Electron-Rich (Diazadiene)magnesium and -manganese Complexes
Electron-rich diazadiene complexes of Mg and Mn can be used as model compounds for enzymatic carboxylation reactions e.g. the „dark reaction” of the photosynthesis or in biotinedependent CO2 conversion reactions. The activity of the complexes to fix and transfer carbon dioxide strongly depends on the nature of the metal (Mg and Mn are active central atoms, other transition metals are inactive), the π aciditiy of the chelate ligand, and the structure of the complexes. The dimeric manganese complex IIa, the structure of which could be determined by X-ray structure analysis, is one of the most active compounds. NMR studies reveal that the CO2 transfer to substrates with active C—H bonds takes place in the coordination sphere of the metal atom. Carrier of activated CO2 is the N—COO group.