to model the data points, and the best fit yielded m = 0.82 (R 2 = 0.89), which accounts for the zero crossing at ~ 70° (Fig. ) by altering the cosine period. This deviation from m = 1 can be understood when taking into account that a side-on HB interacting with the π-orbitals of the C≡N would occur at θ(C≡N---Owater/MeOH) ≈ 70° -80° (Fig. ), and this is the point at which the cosine function should be 0.