Synthesis and comparative studies of phase transition behaviour of new dimeric liquid crystals consisting of dimethyluracil and biphenyl cores
作者:Mohammad AbdulKarim-Talaq、H.T. Srinivasa、Ha Sie-Tiong、S. Hariprasad、Yeap Guan-Yeow
DOI:10.1016/j.molliq.2016.04.025
日期:2016.7
A new homologous series of mesogens containing 6-amino-1,3-dimethyluracil moiety have been synthesized. The structures of the compounds were characterised by elemental analysis, FT-IR, 1H and 13C NMR spectroscopic techniques. Their mesomorphic properties were studied by polarising optical microscopy attached to a heating stage. Microscopy data were supported with transition temperatures and enthalpy
已经合成了包含6-氨基-1,3-二甲基尿嘧啶部分的新的同源的介晶系列。化合物的结构通过元素分析,FT-IR,1 H和13 C NMR光谱技术表征。通过连接到加热台的偏振光学显微镜研究了它们的介晶性质。从差示扫描量热分析获得的转变温度和焓变值支持了显微镜数据。研究表明,化合物的介晶性质取决于烷氧基间隔基的长度。具有较短烷氧基-间隔链(n = 6)的化合物4a-f表现出近晶A相,而化合物4g-r 烷氧基-间隔链(n = 8或10)显示向列相。