| Abstract |
Solvatochromic studies on quinoline (Q) were performed in binary methanol/NN-dimethylforrnamide (MeOH/DMF), propan-1-ol/N,N-dimethylfonnamide (PrOH/DMF), and pentan-1-ol/N,N-dimethylformamide (PeOH/DMF), solvent mixtures, at 25.0 degrees C, using UV-Vis spectrometry. The Preferential Solvation Model of Bosch and Roses was applied to the molar transition energy values corresponding to the absorption maximum of quinoline, E-T(Q), over the whole range of mole fraction of N,N-dimethylfortnamide, x(DMF), and the influence of solvent polarity on these energy values was evaluated. The results show that the solvatochromic response model of Q dissolved in binary HBD/DMF mixtures was different from the HBD/ cyclohexane solvent mixtures studied before. The studies reveal a synergistic solvation behaviour for higher mole fractions of DMF and a preferential solvation of Q by the less polar part of the entity (or complex S12) formed between both components of the mixture or by the DMF molecule. The Q-solvent interactions compete with homo- and heteromolecular solvent-solvent interactions. (c) 2007 Elsevier B.V All rights reserved. |
