| Autor: |
Papadopoulos, Julian, Merkens, Kay, Meller, Thomas J. J. |
| Předmět: |
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| Zdroj: |
Chemistry - A European Journal; 1/19/2018, Vol. 24 Issue 4, p974-983, 10p |
| Abstrakt: |
Novel E-configured coumarin-based merocyanines were efficiently synthesized by a one-pot, three-component Sonogashira coupling-Michael addition starting from triflyl coumarins, terminal alkynes and secondary amines. The photophysical properties of the synthesized yellow to orange merocyanines were studied by UV/Vis and fluorescence spectroscopy and rationalized by Hammett-Taft correlations and DFT and TD-DFT calculations. Most compounds were only weakly fluorescent in solution; however, two compounds were investigated in more detail with respect to their aggregation behavior. The system for R2=H and NR2 3= pyrrolidinyl shows aggregation induced emission at a water content of 40-60% in methanol, while the chromophore with R2=p-Me2NC6H4 and NR2 3=morpholinyl displays considerable aggregation induced emission enhancement with a concomitant redshift at increasing water contents in THF. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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