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Electronic Consequences of Ligand Substitution at Heterometal Centers in Polyoxovanadium Clusters: Controlling the Redox Properties through Heterometal Coordination Number

Meyer, Rachel L.; Anjass, Montaha H.; Petel, Brittney E.; Brennessel, William W.; Streb, Carsten; Matson, Ellen M.

Abstract:
The rational control of the electrochemical properties of polyoxovanadate‐alkoxide clusters is dependent on understanding the influence of various synthetic modifications on the overall redox processes of these systems. In this work, the electronic consequences of ligand substitution at the heteroion in a heterometal‐functionalized cluster was examined. The redox properties of [V$_{5}$O$_{6}$(OCH$_{3}$)$_{12}$FeCl] (1‐[V$_{5}$FeCl] ) and [V$_{5}$O$_{6}$(OCH$_{3}$)$_{12}$Fe]X (2‐[V5Fe]X ; X=ClO$_{4}$, OTf) were compared in order to assess the effects of changing the coordination environment around the iron center on the electrochemical properties of the cluster. Coordination of a chloride anion to iron leads to an anodic shift in redox events. Theoretical modelling of the electronic structure of these heterometal‐functionalized clusters reveals that differences in the redox profiles of 1‐[V$_{5}$FeCl] and 2‐[V$_{5}$Fe]X arise from changes in the number of ligands surrounding the iron center (e.g., 6‐coordinate vs. 5‐coordinate). Specifically, binding of the chloride to the sixth coordination site appears to change the orbital interaction between the iron and the delocalized electronic structure of the mixed‐valent polyoxovanadate core. ... mehr

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Verlagsausgabe §
DOI: 10.5445/IR/1000121171
Veröffentlicht am 10.07.2020
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Anorganische Chemie (AOC)
Publikationstyp Zeitschriftenaufsatz
Publikationsjahr 2020
Sprache Englisch
Identifikator ISSN: 0947-6539, 1521-3765
KITopen-ID: 1000121171
Erschienen in Chemistry - a European journal
Band 26
Seiten chem.201905624
Vorab online veröffentlicht am 25.06.2020
Nachgewiesen in Web of Science
Scopus
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