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Main Title: Vibrational characterization of a diiron bridging hydride complex – a model for hydrogen catalysis
Author(s): Gee, Leland B.
Pelmenschikov, Vladimir
Wang, Hongxin
Mishra, Nakul
Liu, Yu-Chiao
Yoda, Yoshitaka
Tamasaku, Kenji
Chiang, Ming-Hsi
Cramer, Stephen P.
Type: Article
Language Code: en
Abstract: A diiron complex containing a bridging hydride and a protonated terminal thiolate of the form [(μ,κ2-bdtH)(μ-PPh2)(μ-H)Fe2(CO)5]+ has been investigated through 57Fe nuclear resonance vibrational spectroscopy (NRVS) and interpreted using density functional theory (DFT) calculations. We report the Fe–μH–Fe wagging mode, and indications for Fe–μD stretching vibrations in the D-isotopologue, observed by 57Fe-NRVS. Our combined approach demonstrates an asymmetric sharing of the hydride between the two iron sites that yields two nondegenerate Fe–μH/D stretching vibrations. The studied complex provides an important model relevant to biological hydrogen catalysis intermediates. The complex mimics proposals for the binuclear metal sites in [FeFe] and [NiFe] hydrogenases. It is also an appealing prototype for the ‘Janus intermediate’ of nitrogenase, which has been proposed to contain two bridging Fe–H–Fe hydrides and two protonated sulfurs at the FeMo-cofactor. The significance of observing indirect effects of the bridging hydride, as well as obstacles in its direct observation, is discussed in the context of biological hydrogen intermediates.
Issue Date: 6-May-2020
Date Available: 10-Jun-2021
DDC Class: 540 Chemie und zugeordnete Wissenschaften
Subject(s): hydride complex
hydrogen catalysis
diiron complex
Sponsor/Funder: DFG, 390540038, EXC 2008: Unifying Systems in Catalysis "UniSysCat"
Journal Title: Chemical Science
Publisher: Royal Society of Chemistry
Publisher Place: Cambridge
Volume: 11
Issue: 21
Publisher DOI: 10.1039/D0SC01290D
Page Start: 5487
Page End: 5493
EISSN: 2041-6539
ISSN: 2041-6520
Appears in Collections:FG Theoretische Chemie - Quantenchemie » Publications

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