An Infrared Study of the Interaction of Water with Nitrogen Bases

Abstract
In the number of publications relating to the hydrogen bonded complexes between hydroxylic derivatives and bases, there is little quantitative work on the thermodynamic properties of these adducts when monomeric water is acting as a proton donor. The formation constants of 1:1 adduct of water and aliphatic amides1, dioxane2, tributylphosphine3, pyridazine4, some organic bases5 have been reported but there is sometimes a great discrepancy between the literature data; as for example, the reported values of the formation constant for the pyridine-water 1:1 adduct are respectively 100 (in CCl4)6, 6.8 (in CHCl3)7 and 2.63 (in CCl4)8. We report here the association constants for 1:1 complexes between a water molecule and several nitrogen bases. The frequency shift of the νOH stretching vibration is also determined and compared with the proton affinity of the base.

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