Jun 12, 2018 - Scale Viscosity Probes for Lifetime Imagingâ. Anh Thy Bui,* ... methanol and degassed glycerol suggest that viscosity does not play the major ...
Addition/Correction Cite This: J. Am. Chem. Soc. 2018, 140, 8048−8048
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Correction to “Terbium(iii) Luminescent Complexes as MillisecondScale Viscosity Probes for Lifetime Imaging” Anh Thy Bui,* Alexei Grichine,* Alain Duperray, Pierre Lidon, François Riobe,́ Chantal Andraud, and Olivier Maury* J. Am. Chem. Soc. 2017, 139, 7693−7696. DOI: 10.1021/jacs.7b02951
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T
he influence of dissolved oxygen in the photophysical measurements presented in this Communication was underestimated. Following a recent publication by Williams, Parker, and co-workers,1 luminescence measurements of compound [TbL2] were carried out in air-equilibrated and degassed methanol and glycerol solutions. In methanol, very strong enhancement of luminescence properties was observed as oxygen concentration decreased; specifically, the luminescence lifetime increased significantly from 0.22 ms in airequilibrated medium to 1.26 ms in degassed methanol. In contrast, a modest increase was observed in glycerol upon degassing, from 0.86 to 1.00 ms. The comparable lifetimes measured for [TbL2] in degassed methanol and degassed glycerol suggest that viscosity does not play the major role. On the other hand, in air-equilibrated solvents the difference in luminescence lifetimes can be correlated in a first approximation to the large difference of oxygen solubility, varying from 4.15 × 10−4 in methanol to 4.8 × 10−6−5.5 × 10−6 in glycerol, expressed as mole fractions at 298 K and 101.3 kPa.1 While the lifetime measurements performed in various airequilibrated methanol−glycerol mixtures are valid (Figure 2a), their interpretation as a function of the medium viscosity (Figure 2b) is incorrect. Instead, the results should be read as a function of oxygen concentration, which decreases as glycerol content increases.1
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REFERENCES
(1) Walter, E. R. H.; Williams, J. A. G.; Parker, D. Chem. Commun. 2017, 53, 13344−13347.
Published: June 12, 2018 © 2018 American Chemical Society
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DOI: 10.1021/jacs.8b00110 J. Am. Chem. Soc. 2018, 140, 8048−8048
