Self-assembled nanostructures of zwitterionic octaphosphanatoporphyrin 1, of either nanoparticles or nanorods, depending on small changes in the pH, is demonstrated based on the J-aggregates. Porphyrin 1 self-assembled into nanosphere aggregates with a diameter of about 70-80 nm in the pH range 5-7, and nanorod aggregates were observed at pH 8.5. Hydrogen bonding, π-π stacking and hydrophilic interactions play important roles in the formation of this nanostructure morphology. Nanostructures were characterized by UV/Vis absorbance, fluorescence, atomic force microscopy (AFM) and transmission electron microscopy (TEM). This interesting pH dependent self-assembly phenomenon could provide a basis for development of novel biomaterials. © 2011 by the authors; licensee MDPI, Basel, Switzerland.
Bhosale, S. V., Kalyankar, M. B., Nalage, S. V., Lalander, C. H., Bhosale, S. V., Langford, S. J., & Oliver, R. F. (2011). pH dependent molecular self-assembly of octaphosphonate porphyrin of nanoscale dimensions: Nanosphere and nanorod aggregates. International Journal of Molecular Sciences, 12(3), 1464–1473. https://doi.org/10.3390/ijms12031464