本論文於桿形雙炔苯分子及盤狀六炔苯基苯單元外圍之炔苯基引入具較大陰電性的氟原子，由於氟原子與氫原子體積差異不大，利用其產生的偶極矩及分子間氫鍵作用力，微調分子盤與盤堆疊時的作用力，達到大幅降低液晶形成溫度的同時，利用氟原子之特性，和使分子可自組裝排列成高秩序性之筒型液晶。 前半部桿形雙炔苯分子隨著引入氟原子引入，液晶形成溫度有逐漸下降的趨勢；後半部以盤狀分子為主體，於六炔苯基苯外圍苯環相對於中心核之間位增加氟原子，液晶形成溫度不但下降，還大幅增廣液晶存在溫度範圍；此外，由晶體結構證實，兩種不同形狀的分子，其具有的氟原子與鄰近氫原子皆形成氫鍵，此分子間氫鍵推測是為穩定液晶中間相及高秩序性筒型液晶排列主要作用力。六炔苯基苯外圍苯環相對於炔基之鄰位引入氟原子，在與未引入六炔苯基苯化合物比較，液晶形成溫度降低，分子排列由盤狀向列型轉為秩序性較高的筒型液晶。 In this study, fluorine atoms behave high electronegtivity were induced on to rod-like shape structure of diynyl benzene derivatives and disc-like shape structure of hexaynyl benzene derivatives, respectively. Owing to dipole moments arise from fluorine atoms manipulating the stacking interactions between disks and thus lowering the transition temperatures and those two shape of molecules have the ability of self-assembling to form high ordered columnar liquid crystals. It is worthy noting that rod-like and disc-like shape of structure containing fluorine atoms have lower transition temperatures than those don’t contain fluorine atoms. Futhermore the disc-like ones exhibit wider liquid crystal temperature ranges. Single X-ray diffraction results indicate that fluorine atoms in disc-like ones form hydrogen bonding with adjacent hydrogen atoms. Hydrogen bonding stabilize those mesophases and the arrangement of columnar phase. Thus lowering transition temperature and wider mesogenic temperature ranges.
