Porphyrin Aggregation In Aqueous Solutions: Small Angle And Quasielastic Light Scattering Results

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Journal Of Molecular Structure


The porphyrin trans-bis(N-methylpyridinium-4-yl)diphenylporphyine (t-H2Pagg) is known to form in solution large assemblies and supramolecular structures in the presence of polyanions, such as nucleic acids, as a template support. We have studied the aggregation of the unbound porphyrin in 0.1 M NaCl aqueous solutions. The aggregation process was monitored by a time resolved small angle light scattering apparatus. The intensity profile of the scattered light as a function of the exchanged wavevector q, conforms to a scattered law for fractal aggregates in the range 0.2–31.4 μm−1. An analysis of the intensity data reveals a value of the fractal dimension df equal to 2.5. Additional dynamic light scattering measurements confirm the presence of almost monodispersed aggregates in the mesoscopic range.


Small angle light scattering, Quasi elastic light scattering, Porphyrin

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