Explorations of the nonheme high-valent iron-oxo landscape: crystal structure of a synthetic complex with an [FeIV2(μ-O)2] diamond core relevant to the chemistry of sMMOH

Gregory T. Rohde, Genqiang Xue, Lawrence Que

Research output: Contribution to journalArticlepeer-review

3 Scopus citations

Abstract

Methanotrophic bacteria utilize methane monooxygenase (MMO) to carry out the first step in metabolizing methane. The soluble enzymes employ a hydroxylase component (sMMOH) with a nonheme diiron active site that activates O2 and generates a powerful oxidant capable of converting methane to methanol. It is proposed that the diiron(ii) center in the reduced enzyme reacts with O2 to generate a diferric-peroxo intermediate called P that then undergoes O-O cleavage to convert into a diiron(iv) derivative called Q, which carries out methane hydroxylation. Most (but not all) of the spectroscopic data of Q accumulated by various groups to date favor the presence of an FeIV2(μ-O)2 unit with a diamond core. The Que lab has had a long-term interest in making synthetic analogs of iron enzyme intermediates. To this end, the first crystal structure of a complex with a FeIIIFeIV(μ-O)2 diamond core was reported in 1999, which exhibited an Fe⋯Fe distance of 2.683(1) Å. Now more than 20 years later, a complex with an FeIV2(μ-O)2 diamond core has been synthesized in sufficient purity to allow diffraction-quality crystals to be grown. Its crystal structure has been solved, revealing an Fe⋯Fe distance of 2.711(4) Å for comparison with structural data for related complexes with lower iron oxidation states.

Original languageEnglish (US)
Pages (from-to)109-128
Number of pages20
JournalFaraday Discussions
Volume234
DOIs
StatePublished - Nov 5 2021

Bibliographical note

Publisher Copyright:
© 2022 The Royal Society of Chemistry

Keywords

  • Iron/chemistry
  • Methane
  • Oxidation-Reduction
  • Oxygen/chemistry
  • Spectrum Analysis

PubMed: MeSH publication types

  • Journal Article
  • Research Support, U.S. Gov't, Non-P.H.S.
  • Research Support, N.I.H., Extramural
  • Research Support, Non-U.S. Gov't

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