Synthesis and Electrocatalytic Activity of [FeFe]-Hydrogenase Model Complexes with Non-Innocent Chelating Nitrogen-Donor Ligands

Souvik Roy, Joseph A. Laureanti, Thomas L. Groy, Anne Jones

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

To probe the influence of redox non-innocent ligands on a well-known class of [FeFe]-hydrogenase models, three new asymmetrically disubstituted diiron complexes of the general formula (µ-SRS)[Fe(CO)3][Fe(CO)(N-N)] {SRS = propane-1,3-dithiolate (pdt) or benzene-1,2-dithiolate (bdt), and N-N = 2,2′-bipyridine (bipy) or 2,2′-bipyrimidine (bpym)} have been synthesized from their parent hexacarbonyls and characterized. The new complexes, (µ-pdt)Fe2(CO)42-bpym) (2), (µ-bdt)Fe2(CO)42-bipy) (3), and (µ-bdt)Fe2(CO)42-bpym) (4), were fully characterized by spectroscopic and electrochemical techniques, and the results are compared to those of a related complex, (µ-pdt)Fe2(CO)42-bipy) (1). The crystal structures of 2–4 show that, in each complex, the two iron units are in an eclipsed orientation, and the N-N ligand lies in the basal plane. IR spectra and electrochemical analyses indicate that electron density at the iron centers decreases in the order 1 > 2 > 3 > 4. Furthermore, compound 2 undergoes a ligand-centered reduction at the same potential that the hexacarbonyl precursor undergoes its first reduction. However, unlike the 2,2′-bipy derivatives 1 and 3, the 2,2′-bpym complexes 2 and 4 are not effective catalysts for electrochemical proton reduction from acetic acid.

Original languageEnglish (US)
Pages (from-to)2942-2950
Number of pages9
JournalEuropean Journal of Inorganic Chemistry
Volume2017
Issue number23
DOIs
StatePublished - Jun 23 2017

Fingerprint

Hydrogenase
Carbon Monoxide
Chelation
Nitrogen
Ligands
Propane
Benzene
Iron
Acetic Acid
Carrier concentration
Protons
Crystal structure
Derivatives
Catalysts

Keywords

  • Electrocatalysis
  • Electrochemistry
  • Hydrogen
  • N ligands
  • Redox chemistry
  • [FeFe]-hydrogenases

ASJC Scopus subject areas

  • Inorganic Chemistry

Cite this

Synthesis and Electrocatalytic Activity of [FeFe]-Hydrogenase Model Complexes with Non-Innocent Chelating Nitrogen-Donor Ligands. / Roy, Souvik; Laureanti, Joseph A.; Groy, Thomas L.; Jones, Anne.

In: European Journal of Inorganic Chemistry, Vol. 2017, No. 23, 23.06.2017, p. 2942-2950.

Research output: Contribution to journalArticle

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abstract = "To probe the influence of redox non-innocent ligands on a well-known class of [FeFe]-hydrogenase models, three new asymmetrically disubstituted diiron complexes of the general formula (µ-SRS)[Fe(CO)3][Fe(CO)(N-N)] {SRS = propane-1,3-dithiolate (pdt) or benzene-1,2-dithiolate (bdt), and N-N = 2,2′-bipyridine (bipy) or 2,2′-bipyrimidine (bpym)} have been synthesized from their parent hexacarbonyls and characterized. The new complexes, (µ-pdt)Fe2(CO)4(κ2-bpym) (2), (µ-bdt)Fe2(CO)4(κ2-bipy) (3), and (µ-bdt)Fe2(CO)4(κ2-bpym) (4), were fully characterized by spectroscopic and electrochemical techniques, and the results are compared to those of a related complex, (µ-pdt)Fe2(CO)4(κ2-bipy) (1). The crystal structures of 2–4 show that, in each complex, the two iron units are in an eclipsed orientation, and the N-N ligand lies in the basal plane. IR spectra and electrochemical analyses indicate that electron density at the iron centers decreases in the order 1 > 2 > 3 > 4. Furthermore, compound 2 undergoes a ligand-centered reduction at the same potential that the hexacarbonyl precursor undergoes its first reduction. However, unlike the 2,2′-bipy derivatives 1 and 3, the 2,2′-bpym complexes 2 and 4 are not effective catalysts for electrochemical proton reduction from acetic acid.",
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N2 - To probe the influence of redox non-innocent ligands on a well-known class of [FeFe]-hydrogenase models, three new asymmetrically disubstituted diiron complexes of the general formula (µ-SRS)[Fe(CO)3][Fe(CO)(N-N)] {SRS = propane-1,3-dithiolate (pdt) or benzene-1,2-dithiolate (bdt), and N-N = 2,2′-bipyridine (bipy) or 2,2′-bipyrimidine (bpym)} have been synthesized from their parent hexacarbonyls and characterized. The new complexes, (µ-pdt)Fe2(CO)4(κ2-bpym) (2), (µ-bdt)Fe2(CO)4(κ2-bipy) (3), and (µ-bdt)Fe2(CO)4(κ2-bpym) (4), were fully characterized by spectroscopic and electrochemical techniques, and the results are compared to those of a related complex, (µ-pdt)Fe2(CO)4(κ2-bipy) (1). The crystal structures of 2–4 show that, in each complex, the two iron units are in an eclipsed orientation, and the N-N ligand lies in the basal plane. IR spectra and electrochemical analyses indicate that electron density at the iron centers decreases in the order 1 > 2 > 3 > 4. Furthermore, compound 2 undergoes a ligand-centered reduction at the same potential that the hexacarbonyl precursor undergoes its first reduction. However, unlike the 2,2′-bipy derivatives 1 and 3, the 2,2′-bpym complexes 2 and 4 are not effective catalysts for electrochemical proton reduction from acetic acid.

AB - To probe the influence of redox non-innocent ligands on a well-known class of [FeFe]-hydrogenase models, three new asymmetrically disubstituted diiron complexes of the general formula (µ-SRS)[Fe(CO)3][Fe(CO)(N-N)] {SRS = propane-1,3-dithiolate (pdt) or benzene-1,2-dithiolate (bdt), and N-N = 2,2′-bipyridine (bipy) or 2,2′-bipyrimidine (bpym)} have been synthesized from their parent hexacarbonyls and characterized. The new complexes, (µ-pdt)Fe2(CO)4(κ2-bpym) (2), (µ-bdt)Fe2(CO)4(κ2-bipy) (3), and (µ-bdt)Fe2(CO)4(κ2-bpym) (4), were fully characterized by spectroscopic and electrochemical techniques, and the results are compared to those of a related complex, (µ-pdt)Fe2(CO)4(κ2-bipy) (1). The crystal structures of 2–4 show that, in each complex, the two iron units are in an eclipsed orientation, and the N-N ligand lies in the basal plane. IR spectra and electrochemical analyses indicate that electron density at the iron centers decreases in the order 1 > 2 > 3 > 4. Furthermore, compound 2 undergoes a ligand-centered reduction at the same potential that the hexacarbonyl precursor undergoes its first reduction. However, unlike the 2,2′-bipy derivatives 1 and 3, the 2,2′-bpym complexes 2 and 4 are not effective catalysts for electrochemical proton reduction from acetic acid.

KW - Electrocatalysis

KW - Electrochemistry

KW - Hydrogen

KW - N ligands

KW - Redox chemistry

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