Knowledge Bank

The well-known interaction which occurs between acetone and haloforms has been studied by observing the resulting intensity changes in the C-D stretching band of the haloforms. The interacting components were dissolved in a relatively inert solvent, n-hexane, in order to reduce the complicating effects of self-association and of higher order complex formation. The absorptivities of the C-D bands in the free molecules and in the 1:1 complexes have been determined together with equilibrium constants. In addition, heats of formation have been measured by studying the temperature dependence of the equilibrium constants. On the basis of these measurements it is concluded that the strength of the interaction of a given haloform with acetone decreases in the order, $CDCl2>CDCl2Br>CDBr2$.