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Beilstein J. Org. Chem. 2010, 6, 1211–1218, doi:10.3762/bjoc.6.139
Graphical Abstract
Figure 1: Synthesized compounds 1 and 2.
Scheme 1: Syntheses of 1 and 2.
Figure 2: Change in 1H NMR of (A) 1 (400 MHz, CDCl3 containing 0.4% d6-DMSO; c = 2.80 × 10−3 M) and in the pr...
Figure 3: Change in fluorescence ratio of 1 upon addition of one equivalent of anions (c = 4.31 × 10−5 M) at ...
Figure 4: Change in emission of 1 (c = 4.31 × 10−5 M) upon gradual addition of tetrabutylammonium salts of (a...
Figure 5: Suggested modes of binding of the amino acid salts into the open cleft of 1.
Figure 6: Fluorescence titration curves for 1 (c = 4.31 × 10−5 M) at 492 nm.
Figure 7: Fluorescence decays (at λmax = 420 nm) of receptor 1 upon the addition of 1 equiv of L-N-acetylvali...
Figure 8: Change in absorbance of 1 (c = 4.31 × 10−5 M) upon gradual addition of tetrabutylammonium salts of ...
Figure 9: DFT optimized geometry of the complex of 1 with L-N-acetylvaline carboxylate salt [a = 1.93 Å, b = ...
Beilstein J. Org. Chem. 2008, 4, No. 52, doi:10.3762/bjoc.4.52
Figure 1: Structures of compounds 1 and 2.
Scheme 1: Syntheses of receptors 1 and 2.
Figure 2: UV-vis spectra of 1 (c = 5.05 × 10−5 M) in different solvents.
Figure 3: UV-vis spectra of 2 (c = 5.05 × 10−5 M) in different solvents.
Figure 4: UV spectra of the complex of 1 with citric acid (c = 1.67 × 10−5 M) and its change of absorbance on...
Figure 5: UV spectra of the complex of 1 with D-(−)-tartaric acid (c = 1.67 × 10−5 M) and its change of absor...
Figure 6: UV spectra of the complex of 2 with citric acid (c = 1.67 × 10−5 M) and its change of absorbance on...
Figure 7: UV spectra of the complex of 2 with D-(−)-tartaric acid (c = 1.67 × 10−5 M) and its change of absor...
Figure 8: Fluorescence change of 1 in CHCl3 in the presence of carboxylic acids (λex = 290 nm).
Figure 9: Plot of the ratio of excimer to monomer emission vs concentration of the complex of 1 with citric a...
Figure 10: Fluorescence change of 1 in CHCl3 (c = 1.67 × 10−5 M) upon addition of citric acid dissolved in CHCl...
Figure 11: Fluorescence change of 1 in CHCl3 (c = 1.67 × 10−5 M) upon addition of D-(−)-tartaric acid dissolve...
Figure 12: Fluorescence change of 2 in CHCl3 in the presence of carboxylic acids (λex = 290 nm).
Figure 13: Fluorescence change of 2 in CHCl3 (c = 1.67 × 10−5 M) upon addition citric acid dissolved in CHCl3 ...
Figure 14: 1H NMR (in CDCl3) spectra of receptor 1 (c = 3.57 × 10−3 M; bottom) and the 1:1 complex with citric...
Figure 15: AM1 optimized geometries of the complexes of 1 with (a) citric acid, hydrogen bond distances: a = 2...
Figure 16: AM1 optimized geometry of the complex of 2 with citric acid, hydrogen bond distances: a = 2.12 Å, b...