INSTITUTO DE QUIMICA, FISICA DE LOS MATERIALES, MEDIOAMBIENTE Y ENERGIA
Unidad Ejecutora - UE
Freezing Single Molecule Dynamics on Interfaces and in Polymers
STEFAN KRAUSE; PEDRO F. ARAMENDÍA; DANIELA TÄUBER; CHRISTIAN VON BORCZYSKOWSKI
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
ROYAL SOC CHEMISTRY
Heterogeneous line broadening and spectral diffusion of the fluorescence emission spectra ofperylene diimide molecules have been investigated by means of time dependent single moleculespectroscopy. The influence of temperature and environment has been studied and reveales strongcorrelation to spectral diffusion processes. We followed the freezing of the molecular mobility ofquasi free molecules on the surface upon temperature lowering and by embedding into a PMMApolymer. Thereby changes of optical transition energies as a result of both intramolecular changesof conformation and external induced dynamics by the surrounding polymer matrix could beobserved. Simulations of spectral fluctuations within a two level system (TLS) model showed goodagreement with the experimental findings.