Aerogels containing 5, 10, 15, 20-tetrakis-(4-sulfonatophenyl)-porphyrin with controlled state of aggregation. (April 2017)

• Record Type: Journal Article
• Authors: Pino-Pinto, Juan Pablo; Oyarzun-Ampuero, Felipe; Orellana, Sandra L.; Flores, Mario E.; Nishide, Hiroyuki; Moreno-Villoslada, Ignacio
• Is Part Of: Dyes and pigments. Volume 139(2017)
• Page Start: 193
• Page End: 200
• Publication Date: 2017-04
• Subjects: Aromatic-aromatic interactions -- Dye aggregation -- Dye in solid materials -- Porphyrins -- Aromatic polycations; Dyes and dyeing -- Periodicals; Pigments -- Periodicals; 667.2
• DOI: 10.1016/j.dyepig.2016.12.005
• Languages: English
• ISSNs: 0143-7208

Abstract

Abstract: 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. Graphical abstract: Highlights: Aromatic polycations serve to control the aggregation of the dye in solution. Colloidal suspensions containing dye-polycation complexes are obtained. Chitosan-chondroitin sulfate aerogels containing the dye have been synthesized. Aromatic polycations produce homogeneous dispersion of the dye in the aerogels. The dye keeps the same aggregation state in solution and in the aerogels.