Aggregation and exciton emission of a cyanine dye encapsulated within mesoporous MCM-41

Citation
W. Xu et al., Aggregation and exciton emission of a cyanine dye encapsulated within mesoporous MCM-41, J PHYS CH B, 105(32), 2001, pp. 7686-7689
Citations number
32
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Physical Chemistry/Chemical Physics
Journal title
JOURNAL OF PHYSICAL CHEMISTRY B
ISSN journal
1520-6106 → ACNP
Volume
105
Issue
32
Year of publication
2001
Pages
7686 - 7689
Database
ISI
SICI code
1520-6106(20010816)105:32<7686:AAEEOA>2.0.ZU;2-V
Abstract
We report the formation of monomeric and J-aggregated 1,1 ' ,3,3 ' -tetraet hyl-5,5 ' ,6,6 ' -tetrachlorobenzimidazolocarbocyanine (referred to as TTBC ) encapsulated within an aluminosilicate mesostructure, specifically MCM-41 , under different pH conditions. It was necessary to stabilize the synthesi zed MCM-41 through use of a silylation reagent, (aminopropyl)triethoxysilan e, which cross-links oxygen on the surface (thus thickening the walls of th e mesoporous material) and functionalizes the interface for proper guest-ho st interaction. XRD, UV-vis absorption and fluorescence measurements are us ed as spectroscopic tools to characterize the various products. The composi te consisting of J-aggregated TTBC and the aluminosilicate represents a new fluorescent nanomaterial that possesses the properties of the aggregate, y et avoids the essentially unfettered topography and physical length accompa nying the formation of an aggregate in solution or adsorbed onto an interfa ce.