We have investigated conformational structures of meso-meso linked porphyrin arrays (Zn) by single molecule fluorescence spectroscopy. Modulation depths (M values) were measured by excitation polarization fluorescence spectroscopy. The M value decreases from 0.85 to 0.46 as the number of porphyrin units increases from 3 to 128, indicating that longer arrays exhibit coiled structures. Such conformational changes depending on the length have been confirmed by coarse-grained simulation. The histograms of M values and traces of centroid position of emitting sites by localization microscopy showed that the structures of longer arrays changed to more stretched after solvent vapor annealing with tetrahydrofuran.
Bibliographical noteFunding Information:
We thank Prof. John Lupton at the University of Regensburg for helpful discussions about ExPFS. We also thank Prof. Laura Kaufman and Dr. Jaesung Yang at Columbia University and Prof. Heungman Park at Texas A&M UniversityCommerce for providing the localization microscopy software. D.K. acknowledges the support from Global Research Laboratory (2013K1A1A2A02050183) through the National Research Foundation of Korea (NRF) funded by the Ministry of Science, ICT (Information and Communication Technologies) and Future Planning. E.S. acknowledges the support from the National Research Foundation of Korea (NRF) grant funded by the Korea government (MEST) (2017R1A2B2003552).
© 2018 American Chemical Society.
All Science Journal Classification (ASJC) codes
- Physical and Theoretical Chemistry
- Surfaces, Coatings and Films
- Materials Chemistry