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Title: Energy Transfer from Antenna Ligand to Europium(III) Followed Using Ultrafast Optical and X-ray Spectroscopy

Abstract

A series of highly luminescent europium(III) complexes which exhibit photoluminescence from the Eu(III) center following energy transfer from the UV absorbing organic sensitizer have been investigated using a combination of ultrafast optical transient absorption and Eu L3 X-ray transient absorption techniques. We have previously demon- strated that the latter can be used as a signature of 4f–4f excitation responsible for the photoluminescence in these Eu(III) coordination complexes, but the long time scale of the earlier measurements did not allow direct observation of the ligand-to-metal energy transfer step, preventing a determi- nation of the sensitization mechanism. Here, we provide the first direct experimental verification that Dexter electron exchange from the ligand triplet state is the dominant energy transfer mechanism in these photoluminescent systems. Moreover, the optical transient absorption results obtained herein imply that energy transfer for all three compounds has near unity yield, regardless of differences in the sensitization efficiencies, suggesting that the variations in the sensitization efficiencies are determined almost entirely by differences in the ligand-centered intersystem crossing rates. As a result, the implications for the rational design of more effective photoluminescent lanthanide complexes are discussed.

Authors:
ORCiD logo [1];  [2]; ORCiD logo [3];  [3]; ORCiD logo [4]; ORCiD logo [2]
  1. Univ. of California, Berkeley, CA (United States); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
  2. Univ. of California, Berkeley, CA (United States)
  3. Argonne National Lab. (ANL), Lemont, IL (United States)
  4. Univ. of Queensland, Brisbane (Australia)
Publication Date:
Research Org.:
Argonne National Laboratory (ANL), Argonne, IL (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
OSTI Identifier:
1559459
Grant/Contract Number:  
AC02-06CH11357
Resource Type:
Accepted Manuscript
Journal Name:
Journal of the American Chemical Society
Additional Journal Information:
Journal Volume: 141; Journal Issue: 28; Journal ID: ISSN 0002-7863
Publisher:
American Chemical Society (ACS)
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY

Citation Formats

Mara, Michael W., Tatum, David S., March, Anne-Marie, Doumy, Gilles, Moore, Evan G., and Raymond, Kenneth N. Energy Transfer from Antenna Ligand to Europium(III) Followed Using Ultrafast Optical and X-ray Spectroscopy. United States: N. p., 2019. Web. doi:10.1021/jacs.9b02792.
Mara, Michael W., Tatum, David S., March, Anne-Marie, Doumy, Gilles, Moore, Evan G., & Raymond, Kenneth N. Energy Transfer from Antenna Ligand to Europium(III) Followed Using Ultrafast Optical and X-ray Spectroscopy. United States. https://doi.org/10.1021/jacs.9b02792
Mara, Michael W., Tatum, David S., March, Anne-Marie, Doumy, Gilles, Moore, Evan G., and Raymond, Kenneth N. Sun . "Energy Transfer from Antenna Ligand to Europium(III) Followed Using Ultrafast Optical and X-ray Spectroscopy". United States. https://doi.org/10.1021/jacs.9b02792. https://www.osti.gov/servlets/purl/1559459.
@article{osti_1559459,
title = {Energy Transfer from Antenna Ligand to Europium(III) Followed Using Ultrafast Optical and X-ray Spectroscopy},
author = {Mara, Michael W. and Tatum, David S. and March, Anne-Marie and Doumy, Gilles and Moore, Evan G. and Raymond, Kenneth N.},
abstractNote = {A series of highly luminescent europium(III) complexes which exhibit photoluminescence from the Eu(III) center following energy transfer from the UV absorbing organic sensitizer have been investigated using a combination of ultrafast optical transient absorption and Eu L3 X-ray transient absorption techniques. We have previously demon- strated that the latter can be used as a signature of 4f–4f excitation responsible for the photoluminescence in these Eu(III) coordination complexes, but the long time scale of the earlier measurements did not allow direct observation of the ligand-to-metal energy transfer step, preventing a determi- nation of the sensitization mechanism. Here, we provide the first direct experimental verification that Dexter electron exchange from the ligand triplet state is the dominant energy transfer mechanism in these photoluminescent systems. Moreover, the optical transient absorption results obtained herein imply that energy transfer for all three compounds has near unity yield, regardless of differences in the sensitization efficiencies, suggesting that the variations in the sensitization efficiencies are determined almost entirely by differences in the ligand-centered intersystem crossing rates. As a result, the implications for the rational design of more effective photoluminescent lanthanide complexes are discussed.},
doi = {10.1021/jacs.9b02792},
journal = {Journal of the American Chemical Society},
number = 28,
volume = 141,
place = {United States},
year = {Sun Jun 23 00:00:00 EDT 2019},
month = {Sun Jun 23 00:00:00 EDT 2019}
}

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