The mesogenic ability of triolefinic 15-membered azamacrocycles, appropriately functionalised with arenesulfonamide groups, as well as their open precursors and palladium(0) complexes, has been explored. The double bonds increase the rigidity of the macrocycle and are also responsible for the coordination to the metal. These features, along with the substitution pattern of the aryl units, determine the mesomorphic behaviour of the compounds. For example, a smectic mesophase was observed for the macrocycle derived from 4-hexadecyloxybenzenesulfonamides. In contrast, columnar mesophases appear for derivatives that incorporate 3,4-dialkoxybenzenesulfonamides. All of the mesophases were studied by polarising optical microscopy, differential scanning calorimetry and X-ray diffraction, which enabled the determination of the structural parameters.
我们探索了
三烯烃 15 元偶氮杂环的介原能力,这些偶氮杂环经过适当的异磺酰胺基团官能化,以及它们的开放式前体和
钯(0)络合物。双键增加了大环的刚性,也是与
金属配位的原因。这些特征以及芳基单元的取代模式决定了化合物的介形行为。例如,从 4-
十六烷氧基苯磺酰胺中衍生出的大环出现了熔融介相。相反,含有 3,4-二烷氧基苯磺酰胺的衍
生物则出现了柱状介相。通过偏振光学显微镜、差示扫描量热法和 X 射线衍射法对所有介相进行了研究,从而确定了结构参数。