Novel [FeFe]-hydrogenase mimics: unexpected course of the reaction of ferrocenyl α-thienyl thioketone with Fe₃(CO)₁₂ †

Daraosheh, Ahmad Q., Abul-Futouh, Hassan, Murakami, Natsuki, Ziems, Karl Michael, Görls, Helmar, Kupfer, Stephan, Gräfe, Stefanie, Ishii, Akihiko, Celeda, Małgorzata, Mlostoń, Grzegorz and Weigand, Wolfgang (2022) Novel [FeFe]-hydrogenase mimics: unexpected course of the reaction of ferrocenyl α-thienyl thioketone with Fe₃(CO)₁₂ †. Materials, 15 (8), [2867]. (doi:10.3390/ma15082867).

Abstract

The influence of the substitution pattern in ferrocenyl α-thienyl thioketone used as a proli-gand in complexation reactions with Fe₃ (CO)₁₂ was investigated. As a result, two new sulfur–iron complexes, considered [FeFe]-hydrogenase mimics, were obtained and characterized by spectroscopic techniques (¹H,¹³C{¹H} NMR, IR, MS), as well as by elemental analysis and X-ray single crystal diffraction methods. The electrochemical properties of both complexes were studied and compared using cyclic voltammetry in the absence and in presence of acetic acid as a proton source. The performed measurements demonstrated that both complexes can catalyze the reduction of protons to molecular hydrogen H₂ . Moreover, the obtained results showed that the presence of the ferrocene moiety at the backbone of the linker of both complexes improved the stability of the reduced species.

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Contributors

Author: Karl Michael Ziems

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