1. Supramolecular organization of light-harvesting porphyrin macrorings
- Author
-
Yoshiaki Kobuke, Akiharu Satake, Shintaro Azuma, Yusuke Kuramochi, and Shun Hirota
- Subjects
Stereochemistry ,Hydrogen bond ,Organic Chemistry ,Supramolecular chemistry ,Tripod (photography) ,General Chemistry ,Porphyrin ,Catalysis ,chemistry.chemical_compound ,Crystallography ,Reaction rate constant ,chemistry ,Molecule ,Titration ,Singlet state - Abstract
Porphyrin-based supramolecular nanostructures have been produced by the self-assembly of porphyrin macrorings with three benzoic acid groups (Acid-R) on each side of the rings through cooperative carboxyl-carboxyl hydrogen bonds. Structures of the organized Acid-R were analyzed by AFM, and two clear distribution peaks were observed at 3 and 27 nm in the height-distribution histogram. From the overall assessment, the higher objects are considered to be one-dimensional structures standing vertically on the mica substrate. The height corresponds to an 11-mer of a unit Acid-R. Light-harvesting functions were examined by using fluorescence titration, whereby an energy-acceptor molecule (Tripod 2) was employed that strongly interacted with Acid-R units (association constant: 2.0×10(8) M(-1) ), specifically from the inner pore. The titration results showed that the apparent stoichiometry [Tripod 2]/[Acid-R] was
- Published
- 2010