The series of liquid crystalline 4-[(4′-decyloxybiphenyl-4-yl)oxycarbonyl]phthalimide alkane acid methyl esters has been synthesized and studied by DSC, polarized optical microscopy and X-ray diffraction methods. All compounds form a monolayer smectic A phase. It was found that 2-4-[(4′-decyloxybiphenyl-4-yl)oxycarbonyl]-phthalimido}propanoic acid methyl ester and 4-[(4′-decyloxybiphenyl-4-yl)oxycarbonyl]phthalimidoacetic acid methyl ester also form a ribbon S
phase. It was shown clearly that in the former compound, transition from the S
A1
to S
phase occurs via an intermediate S
C1
phase. The 6-4-[(4′-decyloxybiphenyl-4-yl)oxycarbonyl]phthalimido}-hexanoic acid methyl ester exhibits smectic A
1
and C
1
phases only.
采用
DSC、偏光显微镜和X射线衍射方法合成并研究了一系列液晶4-[(4'-癸氧基
联苯-4-基)氧羰基]邻苯二甲
酰亚胺烷酸甲酯。所有化合物均形成单层近晶A相。还发现2-4-[(4'-癸氧基
联苯-4-基)氧羰基]-邻苯二甲酰亚
氨基}
丙酸甲酯和4-[(4'-癸氧基
联苯-4-基)氧羰基]邻苯二甲
酰亚胺乙酸甲酯形成丝带S
阶段。清楚地表明,在前一种化合物中,从 S 的转变
A1
至 S
相通过中间体S发生
C1
阶段。 6-4-[(4'-癸氧基
联苯-4-基)氧羰基]邻苯二甲
酰亚胺基}-
己酸甲酯表现出近晶A
1
和C
1
仅阶段。