Modification of molecular sieves MCM-41 and SBA-15 with covalently grafted pyromellitimide and 1,4,5,8-naphthalenediimide

[Display omitted] ► Mesoporous silicates MCM-41 and SBA-15 were grafted with aromatic imides. ► The imides employed were pyromellitimides and 1,4,5,8-naphthalenediimides. ► The new materials presented interesting absorption and emission properties. This article describes the covalent grafting of pyr...

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Veröffentlicht in:Journal of colloid and interface science 2012-02, Vol.368 (1), p.34-40
Hauptverfasser: Trindade, Fabiane Jesus, Rey, José Fernando Queiruga, Brochsztain, Sergio
Format: Artikel
Sprache:eng
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Zusammenfassung:[Display omitted] ► Mesoporous silicates MCM-41 and SBA-15 were grafted with aromatic imides. ► The imides employed were pyromellitimides and 1,4,5,8-naphthalenediimides. ► The new materials presented interesting absorption and emission properties. This article describes the covalent grafting of pyromellitimide and 1,4,5,8-naphthalenediimide, which are organic semiconductors with very interesting electro-optical properties, onto the walls of mesoporous molecular sieves. The mesoporous materials MCM-41 and SBA-15 were first treated with 3-aminopropyltriethoxysilane, generating materials with a surface coverage of primary amino groups. These materials were further reacted with either pyromellitic dianhydride or 1,4,5,8-naphthalenetetracarboxylic dianhydride, generating surface-bound pyromellitimide or 1,4,5,8-naphthalenediimide, respectively. The success of the modification reactions was confirmed by elemental and thermogravimetric analyses, X-ray diffraction patterns and infrared, reflectance and fluorescence spectroscopies. The results indicated that the mesoporous structure of the new materials was preserved after the modification reactions and that the chromophores were included inside the mesoporous channels with stacked aromatic rings.
ISSN:0021-9797
1095-7103
DOI:10.1016/j.jcis.2011.10.071