HYDROGEN-BONDING .16. A NEW SOLUTE SOLVATION PARAMETER, PI-2(H), FROM GAS-CHROMATOGRAPHIC DATA

The general solvation equation, log V(G)0 (or log L) = c + rR2 + s-pi(2)H + a-alpha(2)H + b-beta(2)H + l log L16 has been used to set up a new pi(2)H parameter of solute dipolarity-polarisability, mainly through the extensive data of McReynolds and Patte et al. Values of pi(2)H are tabulated for several hundred solutes, and two simple rules have been formulated to enable pi(2)H to be estimated for many types of aliphatic functionally substituted compounds. A coherent set of effective solvation parameters, SIGMA-pi(2)H, SIGMA-alpha(2)H, SIGMA-beta(2)H, and also R2 and log L16, allows the application of the general solvation equation to the characterisation of any gas-liquid chromatographic stationary phase.