Produção Nacional
Revisado por pares
Phe–Phe Di-Peptide Nanostructure Self-Assembling Modulated by Luminescent Additives
2019; American Chemical Society; Volume: 4; Issue: 1 Linguagem: Inglês
10.1021/acsomega.8b02732
ISSN2470-1343
AutoresAntonio Carlos Chaves Ribeiro, Geovany Albino de Souza, Douglas Henrique Pereira, Diéricon Sousa Cordeiro, Ramon S. Miranda, Rogério Custódio, Tatiana Duque Martins,
Tópico(s)Luminescence and Fluorescent Materials
ResumoIn this work, supramolecular l-l-diphenylalanine (Phe-Phe) nanostructures were self-assembled in solvents of distinct polarity and in the presence of luminescent additives of distinct conjugation length that physically adhere to the nanostructures to provide growth environments of distinct properties. When the additive is poly[2-methoxy-5-(2-ethylhexyloxy)-1,4-phenylenevinylene], an electron donor polymer, and solvent is tetrahydrofuran (THF), Phe-Phe vesicle-like structures are obtained, whereas in water and in the presence of a similar additive in structure, poly[5-methoxy-2-(3-sulfopropoxy)-1,4-phenylenevinylene], nanotubes are formed. In contrast, when 9-vinyl-carbazole, an electron acceptor additive is used, nanotubes are formed even when THF is the solvent. The same structures are obtained when the additive is the macromolecule poly(vinyl carbazole). The morphologies of these self-assembled structures were observed by scanning electron microscopy, and their photophysical behavior was determined by steady-state fluorescence spectroscopy and time-resolved fluorescence spectroscopy. These data analyzed altogether inform about the formation mechanisms of such structures and about the influence that distinct interactions exert on self-assembling and charge-transfer processes through formation of complexes between the luminescent additives and the Phe-Phe nano- and microstructures.
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