Abstract
In this study, we investigated zinc-tetraphenylporphyrin/γ-cyclodextrin complex formation based on absorption, on fluorescence and circular dichroism spectroscopy, and on fluorescence decay measurement. When the cyclodextrin concentration increased, a new absorption and fluorescence peak appeared and then circular dichloism spectra suggested a chairal aggregate formation. These results indicated that the addition of γ-CD enhanced J-aggregate formation. The morphology of the obtained aggregates was directly observed by SEM and TEM, which showed one-dimensional rod-like structures of 30 nm in diameter and ca. 200 nm in length.
Acknowledgments
We would like to thank Prof. T. Kakuchi, Graduate School of Engineering, Hokkaido University, for the circular dichroism spectroscopic measurements. This work was supported by a Grant-in-Aid for Scientific Research (Nos. 20550001 and 21791929) from MEXT Japan, and by Grant-in-Aid for JSPS Fellows (No. 20–2850) from JSPS.