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Electronic strain effect on Eu(iii) complexes for enhanced circularly polarized luminescence

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Abstract

Luminescent Eu(III) complexes with point-chiral phosphine oxide ligands, [Eu(hfa)3((R,R)-B2QPO)] (hfa: hexafluoroacetylacetonato, B2QPO: 2,3-bis(tert-butylmethylphosphine oxide)quinoxaline) and [Eu(hfa)3((R)-B3QPO)] (B3QPO: 2-tert-butylmethylphosphine oxide-3-(di-tert-butylphosphineoxide)quinoxaline), are reported for the investigation of the electronic strain effect on the coordination sphere. Single crystal X-ray crystallography reveals the strong structural strain of the hfa ligands in [Eu(hfa)3((R,R)-B2QPO)]. The emission quantum yields of [Eu(hfa)3((R,R)-B2QPO)] in solution (55%) and solid (63%) are comparable to those of previously reported bright luminescent Eu(III) complexes. The chiroptical properties of [Eu(hfa)3((R,R)-B2QPO)] and [Eu(hfa)3((R)-B3QPO)] were characterized using circular dichroism (CD) and circularly polarized luminescence (CPL) spectra. The dissymmetry factor of [Eu(hfa)3((R,R)-B2QPO)] was estimated to be 0.08. The chiroptical phenomena of the Eu(III) complexes are closely related to their structural (geometry) and electronic (LMCT: ligand-to-metal charge transfer) strains.

Graphical abstract: Electronic strain effect on Eu(iii) complexes for enhanced circularly polarized luminescence

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Supplementary files

Article information


Submitted
25 Feb 2020
Accepted
24 Mar 2020
First published
24 Mar 2020

Dalton Trans., 2020, Advance Article
Article type
Paper

Electronic strain effect on Eu(III) complexes for enhanced circularly polarized luminescence

M. Tsurui, Y. Kitagawa, K. Fushimi, M. Gon, K. Tanaka and Y. Hasegawa, Dalton Trans., 2020, Advance Article , DOI: 10.1039/D0DT00699H

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