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![Protein Film Infrared Electrochemistry Demonstrated for Study of H2 Oxidation by a [NiFe] Hydrogenase](/_next/image?url=https%3A%2F%2Fcloudfront.jove.com%2FCDNSource%2Fteasers%2F55858.jpg&w=3840&q=50)
Protein Film Infrared Electrochemistry Demonstrated for Study of H2 Oxidation by a [NiFe] Hydrogenase
Published on: December 4, 2017
Nickel-iron dithiolates related to the deactivated [NiFe]-hydrogenases
David Schilter1, Thomas B Rauchfuss
1School of Chemical Sciences, University of Illinois at Urbana-Champaign, Urbana, IL 61801, USA.
Abstract:
Described herein are preparations of synthetic models for the deactivated Ni(II)Fe(II) states of the [NiFe]-hydrogenases. Iodination of the S = ½ species [(dppe)Ni(pdt)Fe(CO)(3)](+) afforded the diamagnetic iodo complex [(dppe)Ni(pdt)IFe(CO)(3)](+). Crystallographic analysis of this species confirmed the presence of square-pyramidal Ni linked to an octahedral Fe centre. The NiFe separation of 3.018 Å indicated the absence of metal-metal bonding. This complex could be reduced to give (dppe)Ni(pdt)Fe(CO)(3) and, in the presence of iodide, decarbonylated to afford (dppe)Ni(pdt)FeI(2). Derivatives of the type [(diphosphine)Ni(dithiolate)XFe(CO)(2)L](+) (X = Cl, Br, I) were prepared by halogenation of mixed-valence precursors [(diphosphine)Ni(dithiolate)Fe(CO)(2)L](+) (diphosphine = dppe, dcpe; L = tertiary phosphine or CO). The Fe(CO)(2)(PR(3))-containing derivatives are more robust than the related tricarbonyl derivatives. Exploiting this greater stability, we characterised examples of chloride and bromide derivatives. Related fluorides could be prepared by F(-) abstraction from BF(4)(-). Spectroscopic evidence is presented for the hydroperoxide [(dppe)Ni(pdt)(OOH)Fe(CO)(2)L](+), which represents a model for the Ni-SU state.
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