pH dependent molecular self-assembly of octaphosphonate porphyrin of nanoscale dimensions: nanosphere and nanorod aggregates

Sheshanath Bhosale, Mohan B Kalyankar, Santosh Nalage, Cecilia Lalander, Sidhanath Bhosale, Steven Langford, Ruth Oliver

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21 Citations (Scopus)


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, pi-pi 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.
Original languageEnglish
Pages (from-to)1464 - 1473
Number of pages10
JournalInternational Journal of Molecular Sciences
Issue number3
Publication statusPublished - 2011

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