Excitation wavelength dependence of ACRYLODAN fluorescence spectra in some polar solvents

Abstract

The fluorescence of ACRYLODAN (6-acryloyl-2-dimethylamino-naphtalene) consists of two bands in liquid polar solvents like 1,2-dichloroethane, N, N-dimethylformamide, or acetonitrile. The intensity ratio of long emission (LE) and short emission (SE) bands, LE/SE, depends on the excitation wave-length. For λexc = 420 nm only LE band appears. The observed two fluorescence bands of ACRYLODAN in polar solvents containing trace amounts of water originate from two different components: LE of ACRYLODAN and SE of the product resulting from hydrolysis back to 2-dimethylaminonaphtalenic acid.