Torsional disorder and planarization dynamics: 9,10-bis(phenylethynyl)anthracene as a case study
| Autor: | Ina Fureraj, Darya S. Budkina, Eric Vauthey |
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| Rok vydání: | 2022 |
| Předmět: | |
| Zdroj: | Physical Chemistry Chemical Physics. 24:25979-25989 |
| ISSN: | 1463-9084 1463-9076 |
| Popis: | Conjugated molecules with phenylethynyl building blocks are usually characterised by torsional disorder at room temperature. They are much more rigid in the electronic excited state due to conjugation. As a consequence, the electronic absorption and emission spectra do not present a mirror-image relationship. Here, we investigate how torsional disorder affects the excited state dynamics of 9,10-bis(phenylethynyl)anthracene in solvents of different viscosities and in polymers, using both stationary and ultrafast electronic spectroscopies. Temperature-dependent measurements reveal inhomogeneous broadening of the absorption spectrum at room temperature. This is confirmed by ultrafast spectroscopic measurements at different excitation wavelengths. Red-edge irradiation excites planar molecules that return to the ground state without significant structural dynamics. In this case, however, re-equilibration of the torsional disorder in the ground state can be observed. Higher-energy irradiation excites torsionally disordered molecules, which then planarise, leading to important spectral dynamics. The latter is found to occur partially |
| Databáze: | OpenAIRE |
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