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pH Dependent Molecular Self-Assembly of Octaphosphonate Porphyrin of Nanoscale Dimensions: Nanosphere and Nanorod Aggregates
School of Chemistry, Monash University, Wellington road, Clayton Victoria 3800, Australia
Department of Organic Chemistry, North Maharashtra University, Jalgaon 425 001, India
* Authors to whom correspondence should be addressed.
Received: 27 January 2011; in revised form: 17 February 2011 / Accepted: 22 February 2011 / Published: 24 February 2011
Abstract: 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, p-p 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.
Keywords: molecular self-assembly; porphyrin; aggregation; AFM; TEM
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MDPI and ACS Style
Bhosale, S.V.; Kalyankar, M.B.; Nalage, S.V.; Lalander, C.H.; Bhosale, S.V.; Langford, S.J.; Oliver, R.F. pH Dependent Molecular Self-Assembly of Octaphosphonate Porphyrin of Nanoscale Dimensions: Nanosphere and Nanorod Aggregates. Int. J. Mol. Sci. 2011, 12, 1464-1473.
Bhosale SV, Kalyankar MB, Nalage SV, Lalander CH, Bhosale SV, Langford SJ, Oliver RF. pH Dependent Molecular Self-Assembly of Octaphosphonate Porphyrin of Nanoscale Dimensions: Nanosphere and Nanorod Aggregates. International Journal of Molecular Sciences. 2011; 12(3):1464-1473.
Bhosale, Sheshanath V.; Kalyankar, Mohan B.; Nalage, Santosh V.; Lalander, Cecilia H.; Bhosale, Sidhanath V.; Langford, Steven J.; Oliver, Ruth F. 2011. "pH Dependent Molecular Self-Assembly of Octaphosphonate Porphyrin of Nanoscale Dimensions: Nanosphere and Nanorod Aggregates." Int. J. Mol. Sci. 12, no. 3: 1464-1473.