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Beilstein J. Org. Chem. 2019, 15, 1096–1106, doi:10.3762/bjoc.15.106
Graphical Abstract
Scheme 1: Quaternization of 2-methylbenzothiazoles with alkane sultones.
Scheme 2: Synthesis of 4-(aza-15-crown-5)benzocarbaldehyde (3) [22].
Scheme 3: Synthesis of dyes 4a–d.
Figure 1: a–c) Dependence of the absorption spectra of the dyes 4b, 4c and 4d, respectively (cL = 1.0 × 10−5 ...
Figure 2: Dependence of the fluorescence of 4b on the concentration of the Ba2+ ions. Excitation wavelength λ...
Figure 3: a) Dependence of absorption spectra of dye 4b (cL = 1.0 × 10−4 M) with Ba2+ (cM = 1 M) on the irrad...
Figure 4: UV–vis absorption spectra of dye 4b (1.0 × 10−4 M) free and in complex with Ba2+ (1 M) before and a...
Figure 5: Optimized structures of the cis and trans isomers of dyes 4a–d.
Figure 6: Optimized structures of the Ba2+-complexes of cis and trans isomer of 4b.
Figure 7: Simulated spectra with spectral lifetime broadening TDPBE0 spectra in ACN for dye 4b and its Ba2+ c...