Comparative Study of Various Equations for the Determination of Dipole Moments of Complexes

Abstract

AbstractThree equations are considered for the determination of the dipole moment μ of complexes, derived respectively from the theory of Onsager and from that of Fröhlich and differing with respect to the role of the internal refractive indexes. In each case either no correction is made for the atomic polarization or this is put equal to 15% of the molar refraction corresponding to the Na D line. The equations are tested for some sixty complexes between compounds with a carbonyl group and phenols. Systematic differences appear between the values of μ computed by means of the three equations which are of the order of 2 a 3 Z. Taking into account the atomic polarization lowers the values of μ of some 5%. Differences in the shape of complexes belonging to the same family seem not to affect the computed values of μab, to a greater extent than the systematic errors.