Preparation, characteristics and crystal structures of novel N-heterocyclic carbene substituted furan- and pyridine-containing azadithiolate Fe–S complexes
作者:Shi Jiang、Jianhui Liu、Yu Shi、Zhen Wang、Björn Åkermark、Licheng Sun
DOI:10.1016/j.poly.2006.11.033
日期:2007.5
Two novel N-heterocyclic carbene disubstituted furan- and pyridine-containing azadithiolate Fe-only hydrogenase models (2 and 4) have been synthesized, and characterized by IR and H-1 NMR spectra and X-ray single crystal diffraction. Cyclic voltammetry (CV) experiments indicate that they show more negative reductive potentials at -2.53 V and -2.49 V, respectively versus the ferrocene/ferrocenium couple (Fc/Fc(+)) and are easier to capture proton attributing to the strong electron-donating ligand NHC. After the protonation under F3CCO2H the reductive potentials of 2 and 4 have 1.02 V and 0.77 V shifts, indicating the formation of Fe-H-Fe bond. The results also are confirmed by the data changes in IR spectra and the negative H signals are detected by 1H NMR spectra at -27 ppm and -55 ppm. (C) 2006 Elsevier Ltd. All rights reserved.
A furan-containing diiron azadithiolate hexacarbonyl complex with unusual lower catalytic proton reduction potential
作者:Shi Jiang、Jianhui Liu、Licheng Sun
DOI:10.1016/j.inoche.2005.11.022
日期:2006.3
A new biomimetic model of the active site of Fe-only hydrogenase [(mu-SCH2)(2)N(2-C4H3O)} Fe-2(CO)(6)] (6) was synthesized and characterized by IR, H-1, C-13 NMR spectroscopy. The butterfly based core structure was also confirmed by X-ray diffraction. The electrochemistry data indicated that the reductive potential at -1.13 V versus Fc/Fc(+) by HClO4 is the lowest of that reported. (C) 2005 Elsevier B.V. All rights reserved.