Regiospecific synthesis of tetrasusubstituted phthalocyanines and their liquid crystalline order
Résumé
Metal-free and metal(II) all-endo-tetraaalkoxy-phthalocyanines of C 4h symmetry are synthesised regio-specifically from 3-(2-butyloctyloxy)phthalonitrile with lithium octanolate and subsequent metal ion exchange. The voluminous, yet not overly large, and racemically disordered alkoxy substituent not only renders the cyclotetramerisation regiospecific, but also leads to liquid crystalline self-assembly with attainable clearing temperatures and persisting columnar organisation at room temperature.....