New calamitic mesogens derived from a furan ring: Synthesis, characterization and study of their mesomorphic behavior
作者:Nabih M. Abdulnabi、Mazin M. Abdul Razzaq Al-Obaidy、Ivan Hameed R. Tomi、Hamed Jasim Jaffer
DOI:10.1016/j.molliq.2020.114562
日期:2021.3
4-alkoxybenzoate (Ca-k) was synthesized by different organic methodologies. These mesogens possess an alkoxy chain at one arm and a nitro group at the opposite arm in addition to various linkages (imine and ester). Their chemical structures have been identified by various essential characterization techniques: infrared spectroscopy (FTIR), 1H and 13C nuclear magnetic resonance (NMR), and electron ionization-mass
通过不同的有机方法合成了一系列新的含呋喃部分的介晶,4-[(((5-(4-硝基苯基)呋喃-2-基)亚甲基)氨基]苯基4-烷氧基苯甲酸酯(C a-k)。这些介晶除了具有各种键(亚胺和酯)外,还在一个臂上具有烷氧基链,在相反臂上具有硝基。它们的化学结构已通过多种基本表征技术进行了鉴定:红外光谱(FTIR),1 H和13C核磁共振(NMR)和电子电离质谱仪(EI-MS)。分别通过差示扫描量热法(DSC)和偏振光学显微镜(POM)研究了同源序列的热转变和光学行为特性。该系列化合物(C a -C k)表现为液晶相,除加热化合物(C d,C e和C f)以外,所有介晶在加热和冷却循环中均表现出对映向列相(N)。仅在冷却循环中为单相向列相。此外,该系列的最后一个成员(C k)除向列相外,还表现出近晶A(SmA)相。所得结果表明,除了对所有介晶的中间相的热稳定性外,对映体和单相介晶性质还受到末端烷氧基尾部