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Título: | Di-amidosils with tunable structure, morphology and emission quantum yield: the role of hydrogen bonding |
Autor: | Nunes, S. C. Huemmer, J. Freitas, V. T. Ferreira, R. A. S. Carlos, L. D. Almeida, P. de Zea Bermudez, V. |
Palavras-chave: | ORGANIC-INORGANIC HYBRIDS NORMAL-ALKYL CHAINS H STRETCHING MODES SOLID-STATE NMR BRIDGED SILSESQUIOXANES INFRARED TEMPERATURE LAMELLAR STRUCTURE SELF-ORGANIZATION LIGHT EMISSION SILICA |
Data: | 2015 |
Editora: | ROYAL SOC CHEMISTRY |
Resumo: | Tailoring of the structure (from amorphous to highly ordered lamellar), morphology (from a homogenous texture to fibers, microparticles, seaweeds- and desert rose-like shapes) and photoluminescence features of five di-amide crossed-linked decyl/siloxanes (di-amidosils, d-A(10)) was achieved via sol-gel chemistry and self-assembly from a single precursor through a fine control of the reaction conditions (water content, catalyst presence/type (HCl or NaOH)/concentration and co-solvent presence/type (ethanol or DMSO)). All the hybrids analyzed are multi-wavelength emitters under UV/visible excitation. Irrespective of the degree of order of the materials, the highest emission quantum yield values (ca. 013 +/- 0.01 excited at 400 nm) were found in samples synthesized in the presence of a catalyst. Comparison of the present data with those reported by our group for a shorter chain di-amidosil and for mono-amidosils revealed that in the amidosils the emission quantum yield is intimately associated with the degree of order of the amide-amide hydrogen-bonded network. This enabled us to establish for the first time a rational and straightforward way of predicting grosso modo the magnitude of the emission quantum yield of an amidosil hybrid prior to measurements, which requires simply the analysis of the amide I band of the FT-IR spectrum. This correlation opens the way to exciting new prospects for the design of new luminescent organic-inorganic hybrids with enhanced properties. |
Peer review: | yes |
URI: | http://hdl.handle.net/10773/20355 |
DOI: | 10.1039/c5tc00721f |
ISSN: | 2050-7526 |
Versão do Editor: | 10.1039/c5tc00721f |
Aparece nas coleções: | CICECO - Artigos |
Ficheiros deste registo:
Ficheiro | Descrição | Tamanho | Formato | |
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Di-amidosils with tunable structure morphology and emission quantum yield the role of hydrogen bonding_10.1039c5tc00721f.pdf | 5.33 MB | Adobe PDF |
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