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Insights from 125Te and 57Fe nuclear resonance vibrational spectroscopy

A [4Fe-4Te] cluster from two points of view
 
: Wittkamp, Florian; Mishra, Nakul; Wang, Hongxin; Wille, Hans-Christian; Steinbrügge, Rene; Kaupp, Martin; Cramer, Stephen P.; Apfel, Ulf-Peter; Pelmenschikov, Vladimir

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Volltext urn:nbn:de:0011-n-5497133 (1.7 MByte PDF)
MD5 Fingerprint: 4273c3d9f1e18b0b518ea8d4fb7fb511
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Erstellt am: 6.7.2019


Chemical Science 10 (2019), Nr.32, S.7535-7541
ISSN: 2041-6520
ISSN: 2041-6539
Englisch
Zeitschriftenaufsatz, Elektronische Publikation
Fraunhofer UMSICHT Oberhausen ()
spectroscopy; iron-sulfur cluster; enzymatic system

Abstract
Iron–sulfur clusters are common building blocks for electron transport and active sites of metalloproteins. Their comprehensive investigation is crucial for understanding these enzymes, which play important roles in modern biomimetic catalysis and biotechnology applications. We address this issue by utilizing (Et4N)3[Fe4Te4(SPh)4], a tellurium modified version of a conventional reduced [4Fe–4S]+ cluster, and performed both 57Fe- and 125Te-NRVS to reveal its characteristic vibrational features. Our analysis exposed major differences in the resulting 57Fe spectrum profile as compared to that of the respective [4Fe–4S] cluster, and between the 57Fe and 125Te profiles. DFT calculations are applied to rationalize structural, electronic, vibrational, and redox-dependent properties of the [4Fe–4Te]+ core. We herein highlight the potential of sulfur/tellurium exchange as a method to isolate the iron-only motion in enzymatic systems.

: http://publica.fraunhofer.de/dokumente/N-549713.html