1,4‐Di‐4‐Pyridylpiperazine; Synthesis, Crystallographic and Mesogenic Studies of its H‐Boned Complexes with p‐Alkoxybenzoic Acids

Abstract

1,4-Di-4-pyridylpiperazine 1 was prepared from reaction of piperazine with 4-chloropyridine and then further blended with p-alkoxybenzoic acids. Subsequently, a series of H-bonded complexes were obtained and the mesogenic behaviours of the complexes were then investigated. A good quality of crystal from 1,4-di-4-pyridylpiperazine and p-octyloxybenzoic acid for single crystal structure determination was also isolated and then studied.Scheme I The preparation of compound 1 Fig. 1. (a; left) the texture of complex 2d at 208.5°C during the heating. (b; right) the texture of complex 2d at 189.5°C during the heating.