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Tunable Rh2(II,II) Light Absorbers as Excited State Electron Donors and Acceptors Accessible with Red/Near-IR Irradiation

Journal Article · · Journal of the American Chemical Society
DOI:https://doi.org/10.1021/jacs.8b00599· OSTI ID:1430408
 [1];  [2];  [3];  [3];  [2];  [2];  [2];  [4]
  1. The Ohio State Univ., Columbus, OH (United States). Department of Chemistry and Biochemistry; The Ohio State University
  2. Texas A & M Univ., College Station, TX (United States). Department of Chemistry
  3. The Ohio State Univ., Columbus, OH (United States). Department of Chemistry and Biochemistry
  4. The Ohio State Univ., Columbus, OH (United States). Department of Chemistry and Biochemistry
In this study, a series of dirhodium(II,II) paddlewheeel complexes of the type cis-[Rh2(μ-DTolF)2(μ-L)2][BF4]2, where DTolF = N,N'-di(p-tolyl)formamidinate and L = 1,8-naphthyridine (np), 2-(pyridin-2-yl)-1,8-naphthyridine (pynp), 2-(quinolin-2-yl)-1,8-naphthyridine (qnnp), and 2-(1,8-naphthyridin-2-yl)quinoxaline (qxnp), were synthesized and characterized. These molecules feature new tridentate ligands that concomitantly bridge the dirhodium core and cap the axial positions. The complexes absorb light strongly throughout the ultraviolet/visible range and into the near-infrared region and exhibit relatively long-lived triplet excited-state lifetimes. Both the singlet and triplet excited states exhibit metal/ligand-to-ligand charge transfer (ML-LCT) in nature as determined by transient absorption spectroscopy and spectroelectrochemistry measurements. When irradiated with low-energy light, these black dyes are capable of undergoing reversible bimolecular electron transfer both to the electron acceptor methyl viologen and from the electron donor p-phenylenediamine. Photoinduced charge transfer in the latter was inaccessible with previous Rh2(II,II) complexes. Finally, these results underscore the fact that the excited state of this class of molecules can be readily tuned for electron-transfer reactions upon simple synthetic modification and highlight their potential as excellent candidates for p- and n-type semiconductor applications and for improved harvesting of low-energy light to drive useful photochemical reactions.
Research Organization:
The Ohio State Univ., Columbus, OH (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
Grant/Contract Number:
AC02-06CH11357; SC0010542; SC0010721
OSTI ID:
1430408
Alternate ID(s):
OSTI ID: 1434737
Journal Information:
Journal of the American Chemical Society, Journal Name: Journal of the American Chemical Society Journal Issue: 15 Vol. 140; ISSN 0002-7863
Publisher:
American Chemical Society (ACS)Copyright Statement
Country of Publication:
United States
Language:
English

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Cited By (7)

Two Four‐Coordinate and Seven‐Coordinate Co II Complexes Based on the Bidentate Ligand 1, 8‐Naphthyridine Showing Slow Magnetic Relaxation Behavior journal December 2019
Photocatalytic H 2 production by dirhodium( ii , ii ) photosensitizers with red light journal January 2018
Electron injection into titanium dioxide by panchromatic dirhodium photosensitizers with low energy red light journal January 2019
Triplet state promoted reaction of SO 2 with H 2 O by competition between proton coupled electron transfer (pcet) and hydrogen atom transfer (hat) processes journal January 2019
Unbridged Rh( ii )–Rh( ii ) complexes of N-heterocyclic carbenes and reactions with O 2 to form dirhodium( μη 1 : η 1 -O 2 ) complexes journal January 2019
A mild synthesis of substituted 1,8-naphthyridines journal January 2019
Photocatalysis with Transition Metal Based Photosensitizers journal December 2019


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