ISSN print edition: 0366-6352
ISSN electronic edition: 1336-9075
Registr. No.: MK SR 9/7
Spectral characterisation of new organic fluorescent dyes with an alkoxysilane moiety and their utilisation for the labelling of layered silicates
Martin Danko, Matej Mičušík, Mária Omastová, Juraj Bujdák, and Dušan Chorvát Jr.
Centre of Excellence GLYCOMED, Polymer Institute, Bratislava, Slovakia
Abstract: New fluorescence dyes with an alkoxysilane moiety were synthesised by the condensation of 3-(triethoxysilyl)-1-propanamine
(3-aminopropyltriethoxysilane) with 4,10-benzothioxanthene-3,1′-dicarboxylic acid anhydride (BTXA) and N,N-dimethylaminonaphthalene-1,8-dicarboxylic acid anhydride (DMANA), which was accompanied by the formation of an imidic bridge.
The compounds N-(3-(triethoxysilyl)propyl)-thioxantheno[2,1,9-dej]isoquinoline-1,3-dione (BTX-S) and 4-(N′, N′-dimethyl)-N-(triethoxysilyl)propyl-1,8-naphthalene dicarboxylic acid imide (DMAN-S) were characterised by steady-state and time-resolved
fluorescence spectroscopy in chloroform and ethanol. Both conjugates (BTX-S and DMAN-S) exhibited absorption and emission
bands in the same region as the un-substituted BTXA and DMANA. An important Stokes shift was observed for DMAN-S in ethanol.
A high fluorescence quantum yield was observed for BTX-S in both solvents and for DMAN-S in chloroform. In addition, the newly
developed fluorescent silane dyes were covalently attached to the microscopic particles of layered silicates and on the surface
of SiO2 wafers as a proof of concept for fluorescence particle (surface) visualisation. The surface wafer modification was precisely
characterised by X-ray photoelectron spectroscopy (XPS). Successful covalent linkage onto the particles of layered silicates
was proved by confocal laser scanning microscopy technique.
Keywords: benzotioxanthene dicarboxylic acid imides – dimethylaminonaphthalene dicarboxylic acid imides – silane – neutral dyes – modification – layered silicates
Full paper is available at www.springerlink.com.
Chemical Papers 67 (1) 18–28 (2013)
Friday, December 04, 2020