Accessing Photoredox Transformations with an Iron(III) Photosensitizer and Green Light

Aydogan A, Bangle RE, Cadranel A, Turlington MD, Conroy DT, Cauët E, Singleton ML, Meyer GJ, Sampaio RN, Elias B, Troian-Gautier L (2021)

Publication Type: Journal article

Publication year: 2021

Journal

Journal of the American Chemical Society American Chemical Society

DOI: 10.1021/jacs.1c06081

Abstract

Efficient excited-state electron transfer between an iron(III) photosensitizer and organic electron donors was realized with green light irradiation. This advance was enabled by the use of the previously reported iron photosensitizer, [Fe(phtmeimb)2]+ (phtmeimb = {phenyl[tris(3-methyl-imidazolin-2-ylidene)]borate}, that exhibited long-lived and luminescent ligand-to-metal charge-transfer (LMCT) excited states. A benchmark dehalogenation reaction was investigated with yields that exceed 90% and an enhanced stability relative to the prototypical photosensitizer [Ru(bpy)3]2+. The initial catalytic step is electron transfer from an amine to the photoexcited iron sensitizer, which is shown to occur with a large cage-escape yield. For LMCT excited states, this reductive electron transfer is vectorial and may be a general advantage of Fe(III) photosensitizers. In-depth time-resolved spectroscopic methods, including transient absorption characterization from the ultraviolet to the infrared regions, provided a quantitative description of the catalytic mechanism with associated rate constants and yields.

Authors with CRIS profile

Alejandro Cadranel Lehrstuhl für Physikalische Chemie I

Additional Organisation(s)

Interdisziplinäres Zentrum für Molekulare Materialien

Involved external institutions

University of North Carolina at Chapel Hill US United States (USA) (US) Université Catholique de Louvain (UCL) BE Belgium (BE) Brookhaven National Laboratory US United States (USA) (US) Université libre de Bruxelles (ULB) / Free University of Brussels BE Belgium (BE)

How to cite

APA:

Aydogan, A., Bangle, R.E., Cadranel, A., Turlington, M.D., Conroy, D.T., Cauët, E.,... Troian-Gautier, L. (2021). Accessing Photoredox Transformations with an Iron(III) Photosensitizer and Green Light. Journal of the American Chemical Society. https://dx.doi.org/10.1021/jacs.1c06081

MLA:

Aydogan, Akin, et al. "Accessing Photoredox Transformations with an Iron(III) Photosensitizer and Green Light." Journal of the American Chemical Society (2021).

BibTeX: Download