Acetylacetone – 2-methoxyethanol solutions: Fourier transform infrared spectral studies

The H-bond interactions in the solutions of acetylacetone (AcAc) with 2-methoxyethanol (2-MOE) have been investigated using FTIR spectroscopy. Theoretical calculations on monomers (eight <i>enol</i> isomers and one <i>keto</i> form) and dimers of AcAc have been carried out. The results confirm that both the <i>keto</i> and <i>enol</i> forms of AcAc exist as monomers in liquid AcAc. The analysis of the carbonyl and hydroxyl bands indicates the existence of both the AcAc conformers in the solutions. The intensity of the bands due to the hydroxyl stretching and in-plane bending vibrations decreases rapidly with a decrease in 2-MOE concentration.