Definition of Koppel-Palm solvent parameters

Parameters to measure separately the ability of a solvent to enter into non-specific solvent-solute interactions (permittivity and refractive index nD) and specific solvent-solute interaction (solvent basicity or nucleophilicity B and solvent acidity or electrophilicity E) as contributing to overall solvent polarity. KOPPEL and PALM (1972).

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