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Hiroki Iwanaga, Photoluminescence Properties of Eu(III) Complexes with Thienyl-Substituted Diphosphine Dioxide Ligands, Bulletin of the Chemical Society of Japan, Volume 92, Issue 8, August 2019, Pages 1385–1393, https://doi.org/10.1246/bcsj.20190068
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Abstract
Two Eu(III) complexes with thienyl-substituted diphosphine dioxide ligands were prepared and their photoluminescence properties were investigated. Quantum yields of Eu(III)(fod)3(DTDOPO) (1) (fod = tris(6,6,7,7,8,8,8-heptafluoro-2,2-dimethyl-3,5-octanedionato) and DTDOPO = dithienyl[3-(dioctylphosphinyl)propyl]phosphine oxide) and Eu(III)(fod)3(DTDBPO) (2) (DTDBPO = dithienyl[5-(dibutylphosphinyl)pentyl]phosphine oxide) in the solid state were remarkably high (ΦTOT (solid) = 0.60 and 0.68, respectively) compared with that of Eu(III)(fod)3(DPDO) (3) (DPDO = diphenyl[3-(dioctylphosphinyl)propyl]phosphine oxide) (ΦTOT (solid) = 0.47). Given that Eu(III)(fod)3(DTDOPO) (1) and Eu(III)(fod)3(DPDO) (3) have the same molecular structure except for their aromatic substituents, substitution of thienyl groups for phenyl groups is effective for increasing the quantum yield of Eu(III) complexes in the solid state. Another noteworthy result regarding the photoluminescence properties of complexes 1 and 2 with thienyl groups is that quantum yields have strong positive linear correlations with concentration in ethyl acetate, and those in the solid state are located on the extended line. This means that no concentration quenching is observed.
