Heterolytic cleavage of hydrogen by an iron hydrogenase model

An Fe-H⋯H-N dihydrogen bond characterized by neutron diffraction

Tianbiao Liu, Xiaoping Wang, Christina Hoffmann, Daniel L DuBois, R Morris Bullock

Research output: Contribution to journalArticle

69 Citations (Scopus)

Abstract

Hydrogenase enzymes in nature use hydrogen as a fuel, but the heterolytic cleavage of H-H bonds cannot be readily observed in enzymes. Here we show that an iron complex with pendant amines in the diphosphine ligand cleaves hydrogen heterolytically. The product has a strong Fe-H⋯H-N dihydrogen bond. The structure was determined by single-crystal neutron diffraction, and has a remarkably short H⋯H distance of 1.489(10) Å between the protic N-Hδ+ and hydridic Fe-Hδ- part. The structural data for [Cp C 5F 4NFeH(PtBu 2NtBu 2H)]+ provide a glimpse of how the H-H bond is oxidized or generated in hydrogenase enzymes. These results now provide a full picture for the first time, illustrating structures and reactivity of the dihydrogen complex and the product of the heterolytic cleavage of H2 in a functional model of the active site of the [FeFe] hydrogenase enzyme. Caught in the act: The addition of H2 to a synthetic iron complex containing a pendant amine (a model complex for [FeFe] hydrogenase) leads to facile heterolytic cleavage of H2. Neutron diffraction indicates a very short H⋯H bond distance of 1.489(10) Å in the Fe-H⋯H-N complex, thus providing a glimpse of how the H-H bond is oxidized in hydrogenase enzymes.

Original languageEnglish
Pages (from-to)5300-5304
Number of pages5
JournalAngewandte Chemie - International Edition
Volume53
Issue number21
DOIs
Publication statusPublished - May 19 2014

Fingerprint

Neutron Diffraction
Hydrogenase
Neutron diffraction
Hydrogen
Enzymes
Iron
Amines
Catalytic Domain
Ligands
iron hydrogenase
Single crystals

Keywords

  • enzyme models
  • hydrogen
  • hydrogenases
  • iron
  • neutron diffraction

ASJC Scopus subject areas

  • Chemistry(all)
  • Catalysis
  • Medicine(all)

Cite this

Heterolytic cleavage of hydrogen by an iron hydrogenase model : An Fe-H⋯H-N dihydrogen bond characterized by neutron diffraction. / Liu, Tianbiao; Wang, Xiaoping; Hoffmann, Christina; DuBois, Daniel L; Bullock, R Morris.

In: Angewandte Chemie - International Edition, Vol. 53, No. 21, 19.05.2014, p. 5300-5304.

Research output: Contribution to journalArticle

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