具雙光軸共價鍵雙分子(有/無摻雜)旋光材料與超分子二元混合體

Abstract

本文實驗合成一系列不對稱共價鍵雙分子(有/無摻雜)旋光材料與氫鍵超分子二元混合體，利用H1-NMR、EA作為結構鑑定。並以POM、電性量測探討其液晶行為。 我們成功合成共價鍵雙光軸雙分子76CB摻入旋光材料Iso、S811皆得到藍相，最寬溫度範圍約24°C。在雙分子76CB中引入旋光中心成功合成出單一分子的藍相液晶76*CB與7F6*CB，有3~5°C的藍相溫度範圍以及20°C左右藍相與N*共存的溫度範圍。 利用吡啶基Py6CB與羧基7*BB、7*FBB行成超分子二元混合體Py6CB-7*BB與Py6CB-7*FBB，在吡啶基與羧基mol比例為1：3時有最寬廣的藍相溫度範圍約9~13°C

We synthesis a series of asymmetric biaxial covalent dimers and hydrogen bonding supramolecular diad mixtures . The chemical structures of these compounds were characterized by H1-NMR、EA, and the liquid crystalline phases and mesomorphic behavior of all compounds were identified from the result of POM、Electro-optical measurement. The biaxial covalent dimer 76CB were synthesized. When doped with Iso、S811 both have blue phase. The widest temperature range is about 24 ° C. Single molecule blue phase dimers 76*CB、7F6* CB, which have chiral center in the central of molecular, were synthesized. The blue phase temperature range is about 3 ~ 5 ° C, and coexistence of the blue phase and N* phase about 20°C. The supramolecular diad mixtures Py6CB-7*BB and Py6CB-7*FBB were prepared, when the molar ratio of Pyridyl and Acid is 1：3 , having the widest blue phase temperature range (9~13°C)