Insights into the two‐electron reductive process of [FeFe]H2ase biomimetics. Cyclic voltammetry and DFT investigation on chelates control of redox properties of [Fe2(CO)4(κ2‐chelate)(µ‐dithiolate)]. - Université de Bretagne Occidentale Access content directly
Journal Articles Chemistry - A European Journal Year : 2020

Insights into the two‐electron reductive process of [FeFe]H2ase biomimetics. Cyclic voltammetry and DFT investigation on chelates control of redox properties of [Fe2(CO)4(κ2‐chelate)(µ‐dithiolate)].

Abstract

The electrochemical reduction of complexes [Fe2(CO)4(k2‐phen)(μ‐xdt)] (phen = 1,10‐phenanthroline ; xdt = pdt (1), adtiPr (2)) in MeCN‐[Bu4N][PF6] 0.2 M is described as a two‐reduction process. DFT calculations show that 1 and its reduced form 1‐ display metal‐ and phenanthroline‐centered frontier orbitals (LUMO and SOMO) indicating the non‐innocence of the phenanthroline ligand. Two energetically close geometries were found for the doubly reduced species suggesting an intriguing influence of the phenanthroline ligand leading to the cleavage of a Fe‐S bond as proposed generally for this type of complex or retaining the electron density and avoiding Fe‐S cleavage. Extension of calculations to other complexes with edt, adtiPr bridge and even virtual species [Fe2(CO)4(k2‐phen)(μ‐adtR)] (R = CH(CF3)2, H) or [Fe2(CO)4(k2‐phen)(μ‐pdtR)] (R = CH(CF3)2, iPr) showed that the relative stability between both two‐electron‐reduced isomers depends on the nature of the bridge and the possibility to establish a remote anagostic interaction between the iron centre {Fe(CO)3} and the group carried by the bridged‐head atom of the dithiolate group.
No file

Dates and versions

hal-02915936 , version 1 (17-08-2020)

Identifiers

Cite

Philippe P. Schollhammer, Federica Arrigoni, Catherine Elleouet, Andrea Mele, François Pétillon, et al.. Insights into the two‐electron reductive process of [FeFe]H2ase biomimetics. Cyclic voltammetry and DFT investigation on chelates control of redox properties of [Fe2(CO)4(κ2‐chelate)(µ‐dithiolate)].. Chemistry - A European Journal, 2020, ⟨10.1002/chem.202003233⟩. ⟨hal-02915936⟩
41 View
0 Download

Altmetric

Share

Gmail Mastodon Facebook X LinkedIn More