Rurack, Knut and Kollmannsberger, Matthias and Daub, Joerg (2001) A highly efficient sensor molecule emitting in the near infrared (NIR): 3,5-distyryl-8-(p-dimethylaminophenyl)difluoroboradiaza-s-indacene. NEW JOURNAL OF CHEMISTRY, 25 (2). pp. 289-292. ISSN 1144-0546
Full text not available from this repository. (Request a copy)Abstract
The spectroscopic properties and the photophysical behaviour of difluoroboradiaza-s-indacene 1, especially designed for the near infrared (NIR) spectral region and equipped with a p-dimethylaminophenyl group at the meso-position, were studied by steady-state and time-resolved optical spectroscopy. Solvent-dependent measurements revealed that for 1, excited state deactivation is governed by population of a non-emissive charge transfer excited state ((CT)-C-1) as the solvent polarity increases, whereas reference compound 2 shows strong fluorescence from a locally excited state ((LE)-L-1) in all the solvents employed. Accordingly, protonation of 1 completely suppresses the quenching excited state charge transfer process and leads to strong enhancement of fluorescence in the NIR, distinguishing 1 as a very sensitive fluorescent sensor molecule for pH or solvent acidity in this favourable wavelength region.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | CHARGE-TRANSFER; SPECTROSCOPIC PROPERTIES; BODIPY DYES; FLUORESCENCE; PHOTOMULTIPLIER; LUMINESCENCE; CONFORMATION; DERIVATIVES; STATE; |
| Subjects: | 500 Science > 540 Chemistry & allied sciences |
| Divisions: | Chemistry and Pharmacy > Institut für Organische Chemie > Alumni or Retired Professors > Prof. Dr. Jörg Daub |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 07 Mar 2022 10:24 |
| Last Modified: | 07 Mar 2022 10:24 |
| URI: | https://pred.uni-regensburg.de/id/eprint/41922 |
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