Abstract
Polarization and apparent dipole moments of a series of symmetrical molecules were determined by the standard method in three solvents: benzene, p -xylene, and mesitylene. Their explanation by complex formation with solvent applies only in the case of 1,4-dicyanobenzene and 4,4’-dicyanobiphenyl since the apparent orientation polarizations ( P O.app ) are large and depend strongly on solvent. On the other hand, 1,4-dihalogenbenzenes do not form any complexes and P O.app is virtually zero. 1,4-Dihalogenbicyclo[2,2,2]octanes reveal also considerable P O.app which is attributed mainly to enhanced atomic polarization but – in the case of heavier halogens – also partly to complexes of unknown structure.
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