Zur Abhängigkeit des molekularen elektrischen Feldgradienten qzz von der mittleren Molekülpolarisierbarkeit ᾱ.

Empirically a linear correlation is established between the average polarisability of the nonspherical molecules CH3Cl, CH2Cl2, CHCl3 and the molecular electric fieldgradient qzz at the chlorine nuclei as determined by “pure quadrupole spectroscopy”. As a consequence of this, a linear relationship between the raman-active vcC-Cl(π)A1 frequency and the “pure quadrupole resonance frequency” of these molecules is also found. In the case of ideal sphere-like molecules, for theoretical reasons, a linear relationship between the molecular electric field gradient and the inverse of the polarisability is proposed. The validity of this correlation is checked in the series of the compounds CCl4, SiCl4, GeCl4 and SnCl4. From the results obtained it is concluded that the correlations put forward are strongly dependent upon the molecular shape.