Atomic polarization in metal chelates. Part 3.—Dielectric loss measurements on some beryllium complexes of certain schiff bases

Abstract

Eight bis(N-alkylsalicylideneiminato)beryllium(II) complexes with alkyl groups Me, Et, Prⁿ, Prⁱ, Buⁿ, Buⁱ, Bu^s, and Bu^t have been studied as solutes in benzene and, in one case, also in dioxan at 25°C. Dipole moments were determined by both static polarization and dielctric loss methods. From these results values of atomic polarization were found to range from about 28 cm³ when the alkyl groups have straight chains to about 10 cm³ when the alkyl groups are branched. This atomic polarization is attributed to concerted motion of the atoms of the chelate rings and it is proposed that its diminution in the cases where the alkyl groups are branched is brought about by intramolecular steric interactions.