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Proceedings Paper

Imaging of photoinduced tautomerism in single porphyrin molecules
Author(s): Regina Jäger; Anna M. Chizhik; Alexey I. Chizhik; Hans-Georg Mack; Alexey Lyubimtsev; Michael Hanack; Alfred J. Meixner
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Paper Abstract

In this work we present our new experimental and theoretical results upon investigations of the photoinduced tautomerism processes of single metal-free porphyrin-type molecules. During tautomerization a molecule changes its structure, therefore the excitation transition dipole moment (TDM) of the molecule changes its orientation. Using confocal microscopy in combination with azimuthally and radially polarized laser beams we are able to determine the orientation of the TDM as well as the orientation of a single molecule itself. In the case of tautomerism we are able to visualize this process and even the involved isomers separately. The study first focuses on two symmetrical compounds: a phthalocyanine and a porphyrin. Additionally, differences of the single molecules embedded in a polymer matrix or just spin-coated on a glass cover slide and under nitrogen flow are investigated. In the latter case we observe a higher frequency of the change of the TDM orientation. The experimental studies are supplemented by quantum chemical calculations. Variations of the molecular substituents, the environment and excitation wavelength can give new insights into the excited-state tautomerism process of a single molecule. We also introduce some suggestions for future experiments to support the understanding of the photoinduced tautomerism.

Paper Details

Date Published: 16 September 2011
PDF: 10 pages
Proc. SPIE 8098, Physical Chemistry of Interfaces and Nanomaterials X, 80980G (16 September 2011); doi: 10.1117/12.893726
Show Author Affiliations
Regina Jäger, Eberhard Karls Univ. Tübingen (Germany)
Anna M. Chizhik, Eberhard Karls Univ. Tübingen (Germany)
Alexey I. Chizhik, Georg August Univ. (Germany)
Hans-Georg Mack, Eberhard Karls Univ. Tübingen (Germany)
Alexey Lyubimtsev, Ivanovo State Univ. of Chemistry and Technology (Germany)
Michael Hanack, Eberhard Karls Univ. Tübingen (Germany)
Alfred J. Meixner, Eberhard Karls Univ. Tübingen (Germany)

Published in SPIE Proceedings Vol. 8098:
Physical Chemistry of Interfaces and Nanomaterials X
Carlos Silva, Editor(s)

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