Thermotropic Transition Metal Complexes Discogens and Their Smectogenic Intermediates

Abstract

The series of the first thermotropic transition metal complexes discogens is completed: bis(p-n-alkylbenzoyl)methanato copper (II) including one derivative possessing two sorts of side chains. The symmetrical and unsymmetrical members of this series exhibit the same very organized discophase. The intermediates for the synthesis, the bis(p-n-alkylbenzoyl)methanes with two identical or different side chains, containing more than 18 carbon atoms exhibit the same very organized optically biaxial and positive smectic phase. The existence of another smectic phase stable at lower temperatures is established for a symmetrical term of this series.