Liquid crystal compounds which show a ferroelectric phase and which exhibit high spontaneous polarization values and smectic behavior over a range of temperatures have the formula ##STR1## wherein R.sup.1 is alkyl of from 1 to 16 carbon atoms; alkoxy; haloalkyl; alkoxyalkyl, wherein the alkoxy substituent thereof comprises a chain of carbon atoms including one or more oxygen ether atoms; or alkoxyalkoxy, wherein the alkoxy substituent thereof comprises a chain of carbon atoms including one or more oxygen ether atoms; R.sup.2 is alkyl of from 1 to 4 carbon atoms; each of R.sup.3 and R.sup.4 is alkylene; n is an integer 1 or 2; and W is alkyl of from 1 to 12 carbon atoms or fluoroalkyl of the formula ##STR2## wherein each of X, Y and Z is hydrogen or fluorine, m is zero or an integer from 1 to 6, and at least one of X, Y and Z is fluorine when m is zero.
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铁电相并在一定温度范围内表现出高自发极化值和液晶行为的液晶化合物具有以下
化学式:##STR1## 其中R.sup.1为1至16个碳原子的烷基;烷氧基;卤代烷基;烷氧基烷基,其中烷氧基取代物包括一个含有一个或多个氧醚原子的碳原子链;或烷氧基烷氧基,其中烷氧基取代物包括一个含有一个或多个氧醚原子的碳原子链;R.sup.2为1至4个碳原子的烷基;R.sup.3和R.sup.4中的每一个为烷基;n为1或2的整数;W为1至12个碳原子的烷基或具有以下
化学式的氟烷基##STR2## 其中X、Y和Z中的每一个为氢或
氟,m为零或1至6的整数,当m为零时,X、Y和Z中至少有一个为
氟。