Luminescent lanthanide complexes with a pyridine-bis(carboxamide)-bithiophene sensitizer showing wavelength-dependent singlet oxygen generation

Katherine R. Johnson; Sebastian B. Vittardi; Manuel A. Gracia-Nava; Jeffrey J. Rack; Ana De Bettencourt-Dias

doi:10.1039/d0dt01034k

Luminescent lanthanide complexes with a pyridine-bis(carboxamide)-bithiophene sensitizer showing wavelength-dependent singlet oxygen generation

Katherine R. Johnson, Sebastian B. Vittardi, Manuel A. Gracia-Nava, Jeffrey J. Rack, Ana De Bettencourt-Dias

Research output: Contribution to journal › Article › peer-review

10 Scopus citations

Abstract

A new pyridine-bis(carboxamide)-based ligand with a bithiophene pendant, 2Tcbx, was synthesized. Its lanthanide ion (Ln^III) complexes, [Ln(2Tcbx)₂]³⁺, were isolated and their photophysical properties were explored. Upon excitation at 360 nm, these complexes display emission in the near-infrared (NIR) with efficiencies of 0.69% for Ln^III = Yb^III, 0.20% for Ln^III = Nd^III, and 0.01% for Ln^III = Er^III, respectively. Concurrent ¹O₂ formation was seen for all complexes, with efficiencies of 19% for the Yb^III complex, 25% for the Nd^III complex, and 9% for the Er^III complex. When exciting at a longer wavelength, 435 nm, only Ln^III emission was observed and larger efficiencies of Ln^III-centered emission were obtained.

Original language	English
Pages (from-to)	6661-6667
Number of pages	7
Journal	Dalton Transactions
Volume	49
Issue number	20
DOIs	https://doi.org/10.1039/d0dt01034k
State	Published - May 28 2020
Externally published	Yes

Funding

The National Science Foundation (CHE 1800392 to AdBD and CHE 1856492 to JJR) is gratefully acknowledged for financial support. Prof. Jorge H. S. K. Monteiro (Humboldt State University) is thanked for his assistance with absorption titrations and some emission spectroscopy.

Funders	Funder number
National Science Foundation	CHE 1800392, 1856492, CHE 1856492, 1800392

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title = "Luminescent lanthanide complexes with a pyridine-bis(carboxamide)-bithiophene sensitizer showing wavelength-dependent singlet oxygen generation",

abstract = "A new pyridine-bis(carboxamide)-based ligand with a bithiophene pendant, 2Tcbx, was synthesized. Its lanthanide ion (LnIII) complexes, [Ln(2Tcbx)2]3+, were isolated and their photophysical properties were explored. Upon excitation at 360 nm, these complexes display emission in the near-infrared (NIR) with efficiencies of 0.69% for LnIII = YbIII, 0.20% for LnIII = NdIII, and 0.01% for LnIII = ErIII, respectively. Concurrent 1O2 formation was seen for all complexes, with efficiencies of 19% for the YbIII complex, 25% for the NdIII complex, and 9% for the ErIII complex. When exciting at a longer wavelength, 435 nm, only LnIII emission was observed and larger efficiencies of LnIII-centered emission were obtained.",

author = "Johnson, {Katherine R.} and Vittardi, {Sebastian B.} and Gracia-Nava, {Manuel A.} and Rack, {Jeffrey J.} and {De Bettencourt-Dias}, Ana",

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doi = "10.1039/d0dt01034k",

language = "English",

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T1 - Luminescent lanthanide complexes with a pyridine-bis(carboxamide)-bithiophene sensitizer showing wavelength-dependent singlet oxygen generation

AU - Johnson, Katherine R.

AU - Vittardi, Sebastian B.

AU - Gracia-Nava, Manuel A.

AU - Rack, Jeffrey J.

AU - De Bettencourt-Dias, Ana

PY - 2020/5/28

Y1 - 2020/5/28

N2 - A new pyridine-bis(carboxamide)-based ligand with a bithiophene pendant, 2Tcbx, was synthesized. Its lanthanide ion (LnIII) complexes, [Ln(2Tcbx)2]3+, were isolated and their photophysical properties were explored. Upon excitation at 360 nm, these complexes display emission in the near-infrared (NIR) with efficiencies of 0.69% for LnIII = YbIII, 0.20% for LnIII = NdIII, and 0.01% for LnIII = ErIII, respectively. Concurrent 1O2 formation was seen for all complexes, with efficiencies of 19% for the YbIII complex, 25% for the NdIII complex, and 9% for the ErIII complex. When exciting at a longer wavelength, 435 nm, only LnIII emission was observed and larger efficiencies of LnIII-centered emission were obtained.

AB - A new pyridine-bis(carboxamide)-based ligand with a bithiophene pendant, 2Tcbx, was synthesized. Its lanthanide ion (LnIII) complexes, [Ln(2Tcbx)2]3+, were isolated and their photophysical properties were explored. Upon excitation at 360 nm, these complexes display emission in the near-infrared (NIR) with efficiencies of 0.69% for LnIII = YbIII, 0.20% for LnIII = NdIII, and 0.01% for LnIII = ErIII, respectively. Concurrent 1O2 formation was seen for all complexes, with efficiencies of 19% for the YbIII complex, 25% for the NdIII complex, and 9% for the ErIII complex. When exciting at a longer wavelength, 435 nm, only LnIII emission was observed and larger efficiencies of LnIII-centered emission were obtained.

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U2 - 10.1039/d0dt01034k

DO - 10.1039/d0dt01034k

M3 - Article

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AN - SCOPUS:85084813733

SN - 1477-9226

VL - 49

SP - 6661

EP - 6667

JO - Dalton Transactions

JF - Dalton Transactions

IS - 20

ER -

Luminescent lanthanide complexes with a pyridine-bis(carboxamide)-bithiophene sensitizer showing wavelength-dependent singlet oxygen generation

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