Covalent attachment of 3,4,9,10-perylenediimides onto the walls of mesoporous molecular sieves MCM-41 and SBA-15

Autor(es)

Trindade, Fabiane J. ; Fernandes, Glauber J. T. ; Araújo, Antônio S. ; Fernandes Junior, Valter J. ; Silva, Barbara P. G. ; Nagayasu, Rafael Y. ; Politi, Mário J. ; Castro, Francisco L. ; Brochsztain, Sergio ^[9]

• Tipo de documento: Artigo Científico
• Fonte: Microporous and Mesoporous Materials; v. 113, n. 1/3, p. 463-471, Aug. 2008.
• Área do conhecimento: Ciências Exatas e da Terra - Química
• Assunto(s): Imidas Compostos de nitrogênio Peneira molecular

Resumo

This work describes the covalent grafting of 3,4,9,10-perylenediimides (PDI), which are fluorescent dyes with very interesting optical properties, onto the walls of mesoporous molecular sieves MCM-41 and SBA-15. The mesoporous materials were first treated with 3-aminopropyltriethoxysilane (APTES) in anhydrous toluene, generating amine-containing surfaces. The amine-containing materials were then reacted with 3,4,9,10-perylenetetracarboxylic dianhydride (PTCA), generating surface-grafted PDI. Infrared spectra of the materials showed that the reaction with amino groups took place at both anhydride ends of the PTCA molecule, resulting in surface attached diimides. No sign of unreacted anhydride groups were found. The new materials, designated as MCMN2PDI and SBAN2PDI, presented absorption and emission spectra corresponding to weakly coupled PDI chromophores, in contrast to the strongly coupled rings usually found in solid PDI samples. The materials showed a red fluorescence, which could be observed by the naked eye under UV irradiation or with a fluorescence microscope. The PDI-modified mesoporous materials showed electrical conductivity when pressed into a pellet. The results presented here show that the new materials are potentially useful in the design of nanowires. (AU)

• Processo FAPESP: 99/07114-2 - Síntese e caracterização de novos materiais compostos de imidas aromáticas
• Beneficiário: Sergio Brochsztain
• Modalidade de apoio: Auxílio à Pesquisa - Jovens Pesquisadores
• Processo FAPESP: 05/51104-4 - Preparação de cápsulas ocas revestidas com camadas de imidas aromáticas para o armazenamento de energia solar
• Beneficiário: Sergio Brochsztain
• Modalidade de apoio: Auxílio à Pesquisa - Regular