9,10-Dibromoanthracene under pressure: Phase transition and reduced excimer stability
✍ Scribed by A. Brillante; K. Reimann; K. Syassen
- Publisher
- Elsevier Science
- Year
- 1988
- Tongue
- English
- Weight
- 387 KB
- Volume
- 151
- Category
- Article
- ISSN
- 0009-2614
No coin nor oath required. For personal study only.
✦ Synopsis
Optical absorption, fluorescence and Raman spectra of 9, IO-dibromoanthracene have been studied as a function of pressure up to 10 GPa. Raman-active lattice phonons show an abrupt change at about 1.5 GPa which indicates a pressure-induced phase transition. Corresponding measurements of the opttcal absorption edge and excimer luminescence reveal a large decrease of the Stokes shift by about 2000 cm-' at the same pressure. The reduced excimer stability is explained in terms of molecular reorientations of adjacent face-to-face molecules due to increased repulsive interactions at the smaller intermolecular separations.