Using the thermochromic shift method of absorption and fluorescence bands, the electric dipole moments in the ground (μg) and excited (μe) state are simultaneously determined for BADAN (6-bromoacetyl-2-dimethylamino-naphtalene) and ACRYLODAN (6-acrylolyl-2-dimethylamino-naphtalene) in ethyl acetate. For these compounds the same ratio μe/μg = 2.9 was found, which is similar to that of PRODAN (6-propionyl-2-dimethylamino-naphtalene).
The estimated empirical Onsager radii afor BADAN and ACRYLODAN are the same, and they are somewhat smaller than the calculated geometrical values.
Keywords: Thermochromic Absorption and Fluorescence Band Shifts; Dipole Moments in the Ground and Excited States; Empirical Radius of the Onsager Cavity
Received: 2002-5-23
Published Online: 2014-6-2
Published in Print: 2002-8-1
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