Wavelength-dependent singlet oxygen generation in luminescent lanthanide complexes with a pyridine-bis(carboxamide)-terthiophene sensitizer

Chemistry : a European Journal
Ana de Bettencourt-DiasJeffrey J Rack

Abstract

Lanthanide ion (Ln III ) complexes, [Ln(3Tcbx) 2 ] 3+ (Ln III = Yb III , Nd III , Er III ), were isolated with a new pyridine-bis(carboxamide)-based ligand with a 2,2':5',2''-terthiophene pendant and their resulting photophysical properties were explored. Upon exciting the complexes at 490 nm, only Ln III emission is observed with efficiencies of 0.29% at 976 nm for Ln III = Yb III and 0.16% at 1053 nm for Ln III = Nd III . Er III emission is observed but weak. When exciting at 400 nm, concurrent 1 O 2 formation is seen, with efficiencies of 11% for the Yb III and Nd III complexes and 13% for the Er III complex. Due to the concurrent generation of 1 O 2 , as would be expected, the efficiency of metal-centred emission decreases to 0.02% for Yb III and 0.05% for Nd III . The ability to control 1 O 2 generation through the excitation wavelength indicates that incorporating 2,2':5',2"-terthiophene resulted in access to multiple sensitization pathways. These energy pathways were unravelled through transient absorption spectroscopy.

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Citations

May 7, 2020·Dalton Transactions : an International Journal of Inorganic Chemistry·Katherine R JohnsonAna de Bettencourt-Dias
Apr 24, 2020·Chemistry : a European Journal·Katherine R JohnsonAna de Bettencourt-Dias
May 22, 2021·Journal of Medicinal Chemistry·Carime V RodriguesAna de Bettencourt-Dias
Jun 20, 2021·Advanced Science·Jiating XuYujie Fu
Sep 14, 2021·Dalton Transactions : an International Journal of Inorganic Chemistry·Plinio Cantero-LópezDayán Páez-Hernández

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