Synthesis And Characterization Of Calix[6]arene And Their Derivatives

During the lastest decades, synthesis of calixarenes has developed fast. Various calixarene compounds and their derivatives have been obtained one after another. Currently, the calixarenes were primarily synthesized by the one-step method and then were modified at the upper and lower rims.With the development of liquid crystal chemistry, design and synthesis of the new structure liquid crystal compounds have become the fundamental task of molecule design. Liquid crystal compounds have been applied in the information recording, display, optoelectronic functional areas and the composite material to a wide range due to their unique to the photoelectric effect. To date people have designed and synthesized a large number of traditional liquid crystal compounds like bar whose molecular structure is slender and 2,3 rings constitute molecule nuclear. Between ring and ring are connected directly or through a central group, and the two ends of moleculars. The central group identifies the linear structure of liquid crystal molecules, and the terminal group plays a major role in the dielectric liquid crystal materials, optical and other anisotropy nature. In recent years, some liquid crystal compounds with geometric features distinctly different from bar molecules such as swallow-tailed-shape, discal-shape, starlike-shape, bananas-shape have emerged.In the paper, p-tert-butyl calix[6]arene, p-methoxy calix[6]arene, calix[6]arene were synthesized according to some relative references and were characterized by FT-IR spectra and'H-NMR. By modifying the upper rim of calixarenes, a seires of derivatives were prepared, which included monocholesteryl succinate, monocholesteryl hexanedioic, monocholesteryl decanedioic,4-undec-10-enoyloxy-benzoic,4-dodecyl-11-acyloxy-benzoic acid,4-tetradecyl-13-acyloxy-benzoic acid,4-hexadecane-15-acyloxy-benzoic acid and 4-octadecanoic-17-acyloxy-benzoic acid. Their chemical structures were confirmed by FT-IR and 1HNMR spectra and their mesonmorphic phase behavior was investigated by differential scanning calorimetry(DSC), polarizing optical microscopy(POM) and thermograrimetric analyzer(TG). Their stucture-propety relationships were discussed.