Structure-Redox Response Correlation in a Few Select Heme Systems Using X-ray Absorption Spectroelectrochemistry

Samajdar, RN and Bhattacharyya, AJ (2021) Structure-Redox Response Correlation in a Few Select Heme Systems Using X-ray Absorption Spectroelectrochemistry. In: Journal of Physical Chemistry B, 125 (20). pp. 5258-5264.

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Abstract

Heme based biomolecules control some of the most crucial life processes, such as oxygen and electron transport during respiration and energy metabolism, respectively. The active site of the heme, viz., the metal center, plays a key role and attributes functionality to these biomolecules. During the oxygen binding and debinding processes, it is important to note that the oxidation state of iron in hemoglobin (+II in the native form) does not undergo any change. However, the spin states of the metal center change. We present here a comprehensive study of the redox response of such molecules, based on the electronic structure of the active site. The local electronic structure of heme in a few selective molecular systems is studied in operando via synchrotron X-ray absorption spectroscopy (Fe K-edge) and cyclic voltammetry. Our objective is to identify the electronic structural parameters that can effectively be correlated with the redox reversibility. Evolution in these parameters can be followed to trace the overall changes in redox state of the system. Our data indicate that axial coordination and spin state of the iron center are two such parameters that are intimately connected with the redox response. ©

Item Type:	Journal Article
Publication:	Journal of Physical Chemistry B
Publisher:	American Chemical Society
Additional Information:	The copyright for this article belongs to American Chemical Society.
Keywords:	Biomolecules; Cyclic voltammetry; Electron transport properties; Electronic structure; Iron; Iron metallography; Metabolism; Oxygen; Spectroelectrochemistry; Spin dynamics; X ray absorption spectroscopy, Axial coordination; Debinding process; Electron transport; Energy metabolism; Local electronic structures; Molecular systems; Structural parameter; Synchrotron x ray absorption spectroscopy, Porphyrins, heme; iron, metabolism; oxidation reduction reaction; X ray; X ray absorption spectroscopy, Heme; Iron; Oxidation-Reduction; X-Ray Absorption Spectroscopy; X-Rays
Department/Centre:	Division of Chemical Sciences > Solid State & Structural Chemistry Unit
Date Deposited:	02 Mar 2023 09:52
Last Modified:	02 Mar 2023 09:52
URI:	https://eprints.iisc.ac.in/id/eprint/80835

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