本篇論文主要包含具有pyrazole結構液晶。所有化合物經由1H-NMR、13C-NMR與元素分析以鑑定其結構及純度，液晶相性質則是利用偏光顯微鏡(POM)來觀測相種類及熱微差掃描分析儀(DSC)測量相變化時之溫度與熱焓值，最後以變溫粉末X光繞射儀(XRD)確認相的種類。 我們成功的合成出兩個系列具pyrazole結構分子。配位基之中心苯環上具有間位取代Mpn時，不具液晶相，然而產生銅錯合物Cu-mpn時，則具有SmA相。特別的是，若對位取代的化合物Ppn，則呈現SmC/SmA液晶相，產生銅錯合物Cu-ppn時，化合物具有SmA/SmC 相。 除此之外，我們亦合成了中心苯環上具有1, 3, 5取代之 Tp8與2Tp12，其不具有液晶相。然而，2Tp12之前驅物，2Tk12，卻具有ColL相。 In this thesis, we report the synthesis, characterization and mesomorphic properties of five novel series of new mesogenic derivates based on pyrazole structures. All compounds were characterized by 1H, 13C-NMR spectroscopy and elemental analysis. The phase behavior of these mesogenic compounds was characterized and studied by differential scanning calorimeter (DSC) and polarization optical microscope. In this work, two series of pyrazole derivatives as coordinating ligands and their copper (II) complexes Cu-mpn and Cu-ppn were prepared and their mesomorphic properties investigated. All pyrazoles Mpn with a meta-substituted benzene were not mesogenic, however, all copper (II) complexes Cu-mpn formed smectic A phases. Interestingly, another series of pyrazoles Ppn with a para-substituted benzene and their copper (II) complexes Cu-ppn exhibited smectic phases. In addition, we designed and characterized a series of organic molecule Tp8 and 2Tp12 derived from pyrazole with a 1,3,5-substituted benzene, and they didn’t exhibit mesophase. However, their precursor, 2Tk12, exhibited ColL phase.
