Abstract
A solvatochromic study of the vibronic fine structure of the 1 Lb absorption band of 1,2-dicyanobenzene (DCB), in several non-polar and polar solvents including aliphatic amines was made. The spectral properties were analyzed by means of theoretical parameters as well as by K amlet and T aft's solvatochromic comparison method. The solvatochromic behavior of the 1 Lb absorption band of DCB has been accounted fundamentally as dielectric in nature except for the aliphatic amines as solvents. The anomalous behavior of aliphatic amines is explained by considering that the solute interacts via electron donor-acceptor (EDA) complex formation with these solvents. A qualitative approach based on the use of the ratio of vibronic band intensities is proposed as a sensible method to detect these type of EDA interactions.
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