Solute-Stationary Phase Interaction in Gas Liquid Chromatography. Relative Retention Values for Monosubstituted Benzene Derivatives and the Role of a New Descriptor for Regression Analysis

The descriptor μ2/α was introduced by the classical equations for the orientation and induction energies. As the descriptor has the dimension of energy, it is not convenient to discuss in detail. The dipole moment in the benzene series μaro is evaluated from both the bond moment μb and the mesomeric moment μm. We redefine the new descriptors σbd and σms modifind to dimensionless values from μb and μm for the standard benzene as well as the descriptor σS°. The relative retention values logγ on monosubstituted benzene derivatives are analyzed satisfactorily, using σS°, σbd, and σ+ms for electron-donating group, and a new descriptor (σS°·σbd)1/2(N), which has a relation to the depole moment of the excited state in C