From fractal to nanorod porphyrin J-aggregates. Concentration-induced tuning of the aggregate size

The Journal of Physical Chemistry. B
Norberto MicaliLuigi Monsù Scolaro

Abstract

A structural change from fractal to nanorod J-aggregates of tetrakis(4-sulfonatophenyl)porphyrin has been obtained by acting on the intermolecular interaction potential. The size and shape of these self-assembled porphyrin clusters have been monitored under different experimental conditions, by means of polarized and depolarized dynamic light scattering and small and wide angle elastic light scattering. At sufficiently low porphyrin concentration and high ionic strength, the shielded repulsive potential seems to be responsible for the fractal structure of the aggregates. On the contrary, at low ionic strength (nonshielded potential) and high porphyrin concentration, these species self-assemble in a rodlike arrangement. The length of the so-formed rod-shaped aggregates decreases on increasing porphyrin concentration. Moreover, both fractals and rods display a structure-dependent optical activity induced by a chiral template.

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Citations

Sep 15, 2012·Inorganic Chemistry·Ilaria OcchiutoRobert F Pasternack
Aug 19, 2011·Langmuir : the ACS Journal of Surfaces and Colloids·Lizhi ZhaoLinqi Shi
Jan 14, 2012·Physical Chemistry Chemical Physics : PCCP·Christopher C Rich, Jeanne L McHale
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