preparation and characterization of a new derivative of rhodamine b with an alkoxysilane moiety论文.pdf

Dyes and Pigments 76 (2008) 550e556

Preparation and characterization of a new derivative of rhodamine
B with an alkoxysilane moiety
T. Nedelcev*,cko, I. Krupa
Polymer Institute, The Slovak Academy of Sciences (SAS), Du´bravska´ cesta 9, 842 36 Bratislava, Slovakia
Received 11 September 2006; accepted 9 November 2006
Available online 26 December 2006
Abstract
The synthesis of a novel rhodamine B derivative carrying an alkoxysilane moiety (RBS) is described. Rhodamine B (RB) was attached to the
Si atom by an amide linkage to provide the functionalized silane via the condensation of 3-aminopropyltriethoxysilane (APTES) with RB by
azeotropic distillation in water. The physical properties and structure of RBS were characterized using 1H NMR, 13C NMR, HH COSY, FTIR,
UVevis measurements spectra and Kofler’s apparatus. The absorbance of RBS was times higher than that of RB. The equilibrium confor-
mation of the RBS molecule was determined by means of a molecular simulation study; spectral properties are discussed based on the obtained
computational results.
Ó 2006