Restricted Conformation Dynamics of Single Functionalized Perylene Bisimide Molecules on SiO₂ Surfaces and in Thin Polymer Films

Danny Kowerko (1) , Jörg Schuster (2) , Christian von Borczyskowski (2)

1 institute of physics
2 institute of physics

Intramolecular conformational dynamics caused by the bay groups of perylene bisimide (PBI) molecules have been investigated by single molecule spectroscopy in thin PMMA polymer films and on SiO₂ surfaces. All dynamic processes occur in a jump-like fashion on SiO₂ but in a likewise continuous way in PMMA. Surface attachment on SiO₂ is accomplished by pyridyl functionalisation of PBI demonstrating a nearly perpendicular orientation of the long axis of perylene as has been concluded from polarisation experiments. This orientation is subject to fluctuations of the molecular orientation and/or conformation, which are considerably reduced in PMMA. According to static and time dependent fluorescence spectra at least 2 different conformations have been identified.

Mots clés: Physical Sciences

Danny Kowerko, Jörg Schuster, Christian von Borczyskowski. Restricted Conformation Dynamics of Single Functionalized Perylene Bisimide Molecules on SiO₂ Surfaces and in Thin Polymer Films. Molecular Physics, 2009, 107 (18), pp.1911-1921. ⟨10.1080/00268970902758631⟩. ⟨hal-00514964⟩