pH Dependent Molecular Self-Assembly of Octaphosphonate Porphyrin of Nanoscale Dimensions: Nanosphere and Nanorod Aggregates

International Journal of Molecular Sciences

Sheshanath V. Bhosale²  Mohan B. Kalyankar²  Santosh V. Nalage¹  Cecilia H. Lalander²  Sidhanath V. Bhosale¹  Steven J. Langford² 

[1] Department of Organic Chemistry, North Maharashtra University, Jalgaon 425 001, India; E-Mail:;School of Chemistry, Monash University, Wellington road, Clayton Victoria 3800, Australia; E-Mails:

关键词: molecular self-assembly;    porphyrin;    aggregation;    AFM;    TEM;   

DOI  :  10.3390/ijms12031464

来源: mdpi

【 摘 要 】

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.

【 授权许可】

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© 2011 by the authors; licensee MDPI, Basel, Switzerland.