title: Photochromic Solid Materials Based on Poly(decylviologen) Complexed with Alginate and Poly(sodium 4-styrenesulfonate).
abstract: Photochromic solid materials based on the cationic polymer poly(decylviologen) are reported. The solids were obtained by freeze-drying colloidal suspensions of nanocomplexes obtained by mixing aqueous solutions of the polycation with different solutions of polyanions such as poly(sodium 4-styrenesulfonate) or sodium alginate, at a cationic/anionic polymeric charge ratio of 0.7. The photochromic responses of the solid materials fabricated with alginate as complementary charged polyelectrolyte of the cationic polyviologen are faster than those of the solid materials fabricated with poly(sodium 4-styrenesulfonate), achieving coloration kinetics in the order of minutes, and discoloration kinetics in the order of hours for the former. Aromatic-aromatic interactions between the latter polyanion and the polyviologen may stabilize the dicationic form of the viologen derivative, increasing the necessary energy to undergo photoreduction, thus decreasing the reduction kinetics.
authors.forename: Luis
authors.initials: L
authors.lastname: Sanhueza
authors.forename: Joaquín
authors.initials: J
authors.lastname: Castro
authors.forename: Esteban
authors.initials: E
authors.lastname: Urzúa
authors.affiliation: Departamento de Química, Facultad de Ciencias Básicas, Universidad Metropolitana de Ciencias de la Educación , Avenida José Pedro Alessandri 774, Ñuñoa, Santiago, Chile.|Center for the Development of Nanoscience and Nanotechnology, CEDENNA , Santiago, Chile.
authors.forename: Lorena
authors.initials: L
authors.lastname: Barrientos
authors.affiliation: Department of Science and Pharmaceutical Technology, Universidad de Chile , Santiago, Chile.
authors.forename: Felipe
authors.initials: F
authors.lastname: Oyarzun-Ampuero
authors.forename: Héctor
authors.initials: H
authors.lastname: Pesenti
authors.forename: Toshimichi
authors.initials: T
authors.lastname: Shibue
authors.forename: Natsuhiko
authors.initials: N
authors.lastname: Sugimura
authors.forename: Wataru
authors.initials: W
authors.lastname: Tomita
authors.forename: Hiroyuki
authors.initials: H
authors.lastname: Nishide
authors.forename: Ignacio
authors.initials: I
authors.lastname: Moreno-Villoslada
mesh_terms: D000464:Alginates / Q000737:chemistry*; D020723:Glucuronic Acid / Q000737:chemistry; D006603:Hexuronic Acids / Q000737:chemistry; D017348:Microscopy, Electron, Scanning Transmission; D011108:Polymers / Q000737:chemistry*; D066244:Proton Magnetic Resonance Spectroscopy; D013451:Sulfonic Acids / Q000737:chemistry*
chemical_list: D000464:Alginates; D006603:Hexuronic Acids; D011108:Polymers; D013451:Sulfonic Acids; D020723:Glucuronic Acid; C077114:styrenesulfonic acid polymer