DPG Phi
Verhandlungen
Verhandlungen
DPG

Berlin 2001 – scientific programme

Parts | Days | Selection | Search | Downloads | Help

MO: Molekülphysik

MO 12: Posters Friday: Spectroscopy

MO 12.33: Poster

Friday, April 6, 2001, 12:30–15:00, AT3

The orientation of oxonine-molecules in the nano channels of zeolite L — •Christina Debus1, Andreas Drechsler1, M. Andreas Lieb1, Alfred J. Meixner1, Silke Megelski2, Marc Pauchard2, Stephan Glaus2 und Gion Calzaferri21Physikalische Chemie, Universität Siegen, 57068 Siegen — 2Departement für Chemie und Biochemie, Universität Bern, CH-3012 Bern

The orientation of the S1S0 π , π transition dipole moment of oxonine in the channels of zeolite L crystals was investigated by means of fluorescence microscopy and single-crystal imaging. We found, that the transition moments, which are oriented parallel to the molecules’ long axis are not aligned along the zeolite’s channel axis as expected but show a cone-shaped distribution with a half cone angle of 72 . However, geometrical space-filling arguments based on the zeolite L structure give room for only two possible arrangements of the molecules’ long axis: a half cone angle of up to 40 or an angle of about 90 with respect to the c-axis of zeolite L. The surprising discrepancy between geometrical considerations and the results of the fluorescence measurements can be explained by assuming that oxonine is exposed to a considerable anisotropic electrical field in the zeolite channels.

100% | Mobile Layout | Deutsche Version | Contact/Imprint/Privacy
DPG-Physik > DPG-Verhandlungen > 2001 > Berlin