title: Hybrid pigments resulting from several guest dyes onto γ-alumina host: A spectroscopic analysis.
abstract: The synthesis of hybrid pigments was made from combination of γ-Al2O3and some organic chromophores such as carminic acid, alizarin, purpurin, curcumin, fluorescein and betacyanins. The γ-Al2O3was obtained through sol-gel synthesis with 2-propanol and aluminium tri-sec-butoxide (ATB). This article presents some spectroscopic evidences related to the formation of aluminium complexes between coordinative unsaturated sites (CUS) of aluminium and some organic groups (carboxylic acid, quaternary ammonium and β-keto enol) present in the chromophores structure. The physicochemical properties upcoming from a spectroscopic analysis point out that these materials can be applied in the design of new materials with potential uses in artworks and in the field of cultural heritage.
authors.affiliation: Instituto de Investigaciones en Materiales, Universidad Nacional Autónoma de México, Circuito Exterior s/n Ciudad Uiversitaria, Coyoacán, México, DF 04510, Mexico.
authors.forename: Erik
authors.initials: E
authors.lastname: Pérez
authors.affiliation: Instituto de Investigaciones en Materiales, Universidad Nacional Autónoma de México, Circuito Exterior s/n Ciudad Uiversitaria, Coyoacán, México, DF 04510, Mexico.
authors.forename: Ilich A
authors.initials: IA
authors.lastname: Ibarra
authors.affiliation: Instituto Politecnico Nacional, ESIQIE-SEPI-DIQI, Laboratorio de Investigación en Materiales Porosos, Catálisis Ambiental y Química Fina (LiMpCa-QuF), UPALM Edif. 7 P.B. Zacatenco, GAM, México, DF 07738, Mexico.
authors.forename: Ariel
authors.initials: A
authors.lastname: Guzmán
authors.affiliation: Instituto de Investigaciones en Materiales, Universidad Nacional Autónoma de México, Circuito Exterior s/n Ciudad Uiversitaria, Coyoacán, México, DF 04510, Mexico. Electronic address: lima@iim.unam.mx.
authors.forename: Enrique
authors.initials: E
authors.lastname: Lima
keywords: Alumina; Chromophore; Colour; Dyes; MAS NMR; Pigments