Experimentally a large number of linear relations have been found between the change in OH stretching frequency, Av, on hydrogen bonding and the hydrogen bond energy, AH. A least square treatment of these A< against AH relations is carried out for constant acceptor, variable donor as well as constant donor, variable acceptor systems. Generally, the constant-acceptor plots have much higher values of intercepts than the constant-donor plots. The slopes of the constant-donor plots seem to vary with the basicity of the donor. However, since 4i should go to zero when there is no interaction, it is suggested that the complete 4 v against 4 H relation could be nonlinear. Molecular orbital calculations have been employed to throw light on the A< against AH relation. It is also shown that charge transfer theory when applied to the hydrogen bond predicts a relation between A H and the quantity where Go and V are the free and perturbed OH stretching frequencies.
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