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Int. J. Mol. Sci. 2011, 12(3), 1464-1473; doi:10.3390/ijms12031464
Article

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

1,* , 1,2
,
2
,
1
,
2,* , 1
 and
1
1 School of Chemistry, Monash University, Wellington road, Clayton Victoria 3800, Australia 2 Department of Organic Chemistry, North Maharashtra University, Jalgaon 425 001, India
* Authors to whom correspondence should be addressed.
Received: 27 January 2011 / Revised: 17 February 2011 / Accepted: 22 February 2011 / Published: 24 February 2011
(This article belongs to the Special Issue Molecular Self-Assembly)
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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 molecular self-assembly; porphyrin; aggregation; AFM; TEM
This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).
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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.

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