pH-Sensitive Fluorescence Lifetime Molecular Probes Based on Functionalized Tristyrylbenzene
| Autor: | Andrés Garzón, Iván Bravo, Juan Tolosa, Joaquín C. García-Martínez, Julián Rodríguez-López, Jesús Canales-Vázquez, José Albaladejo, Pedro J. Pacheco-Liñán |
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| Rok vydání: | 2016 |
| Předmět: |
Quenching (fluorescence)
Titration curve Chemistry Analytical chemistry 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology Photochemistry 01 natural sciences Fluorescence Fluorescence spectroscopy Photoinduced electron transfer 0104 chemical sciences Surfaces Coatings and Films Electronic Optical and Magnetic Materials General Energy Dynamic light scattering Microscopy Physical and Theoretical Chemistry 0210 nano-technology Laser-induced fluorescence |
| Zdroj: | The Journal of Physical Chemistry C. 120:18771-18779 |
| ISSN: | 1932-7455 1932-7447 |
| DOI: | 10.1021/acs.jpcc.6b05526 |
| Popis: | The dependence of the fluorescence on pH for two 1,3,5-tristyrylbenzenes decorated with polyamine (compound 1) and poly(amidoamine) (compound 2) chains at the periphery was investigated. The highest fluorescence intensities were observed under acidic conditions because electrostatic repulsions between positively charged molecules reduce the fluorescence quenching. The slopes observed in the fluorescence pH titration curves were associated with deprotonation of the different types of amine groups, which results in quenching by photoinduced electron transfer and aggregation processes. The linear dependence of fluorescence lifetime observed for different pH ranges is a valuable property for applications in the field of fluorescence lifetime sensors and imaging microscopy. The influence of the pH and the peripheral chains on the aggregation processes was also analyzed by absorption and emission spectroscopy, dynamic light scattering measurements, and transmission electron microscopy. For compound 1, bands ass... |
| Databáze: | OpenAIRE |
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