Artículo de revista
Aerogels containing 5,10,15,20-tetrakis-(4-sulfonatophenyl)-porphyrin with controlled state of aggregation
Fecha
2017Registro en:
Dyes and Pigments 139 (2017) 193-200
18733743
01437208
10.1016/j.dyepig.2016.12.005
Autor
Pino Pinto, Juan Pablo
Oyarzún Ampuero, Felipe
Orellana, Sandra L.
Flores, Mario E.
Nishide, Hiroyuki
Moreno Villoslada, Ignacio
Institución
Resumen
Aerogels made of chitosan and chondroitin sulfate, and containing 5,10,15,20-tetrakis-(4-
sulfonatophenyl)-porphyrin have been synthesized. The aerogels presented a microstructure made of
microfibers and microsheets, with porosity higher than 99%. The dispersion and state of aggregation of
the dye in the solids have been controlled with the aid of aromatic polyelectrolytes able to produce
aromatic-aromatic interactions. Thus, non-homogenous dispersions of the dye as J-aggregates and formation
of microcrystals on the microsheet surface were observed in the absence of the aromatic polymers;
on the contrary, well dispersed H-aggregates of the dye were observed in the presence of
poly(decylviologen), and well dispersed complexed monomeric dye molecules were found in the presence
of a polyketone derivatized with hystamine, thus presenting imidazolium pendant groups. The
same state of aggregation has been observed in solution for the respective complexes, highlighting the
potential of aromatic-aromatic interactions to achieve a control of the state of aggregation of dyes in
solution and further transfer to the solid state keeping their photophysical properties, and furnishing
means for a good dispersion of the dyes in solid materials.