A new series of rod-shaped mesomorphic compounds, 6-methyl-2-(4-alkoxybenzylidenamino)benzothiazoles bearing a fused thiazole ring and imine central linkage, were prepared and their molecular structures were confirmed via mass spectrometric, IR and NMR spectroscopic techniques. The mesomorphic properties were identifed using differential scanning calorimetry, polarizing optical microscopy and X-ray diffraction analysis. All compounds showed enantiotropic mesomorphism. Whilst the lower members of the series, butyloxy, hexyloxy and octyloxy derivatives exhibited nematic phase, the medium members (decyloxy derivative) exhibited nematic and smectic A phases. The higher members (C12, C14, C16 and C18 derivatives) displayed smectic A phase only.
制备了一系列新的棒状介形化合物--6-甲基-2-(4-烷氧基亚苄基
氨基)
苯并噻唑,它们具有融合的
噻唑环和
亚胺中心连接,并通过质谱、红外光谱和核磁共振光谱技术确认了它们的分子结构。利用差示扫描量热法、偏振光学显微镜和 X 射线衍射分析确定了它们的介形性质。所有化合物都表现出了对映体介形性。该系列的低级成员,丁氧基、己氧基和辛氧基衍
生物表现出向列相,而中级成员(癸氧基衍
生物)则表现出向列相和共晶 A 相。较高的成员(C12、C14、C16 和 C18 衍
生物)仅表现出胶凝 A 相。