State analysis and thermal changes of dissolved water in decane, dibutyl ether, 3-decanone and methyl decanoate as determined by FT IR spectroscopy

The state of dissolved water in hydrophobic organic compounds such as decan e(DAN), dibutyl ether (DBE), 3-decanone(DON) and methyl decanoate(MD) were studied by FT IR spectroscopy at 20 degrees C, and examination was also mad e of the temperature dependence of this water in such solvents. In DAN, the state of dissolved water was essentially that of water vapor. In DBE, most of the dissolved water formed large clusters through hydrogen bond between ether groups and water molecules. In DON, the dissolved water consisted of cluster I (dimer-trimer mixture), IT due to hydrogen bond between ketonic group and water molecule, and ill o f liquid water. In MD, this water was comprised of clusters I, Il and III. The cluster I in dissolved water were vaporized at 40 degrees C to 80 degrees C, large clus ters II and III in dissolved water gradually split into smaller cluster wit h increasing temperature, though some still remainded.