Liquid Crystal of Ethyl and Propyl Aromatic Aldehyde with Azo Core and Photosensitivity in Mesophase

摘要

Eight new stable rod-like aromatic aldehyde liquid crystalline molecules with azo bridge have been prepared, in which single or double six-membered carbon ring carboxylic acid mesogenic cores with shorter alkyl chain of ethyl, n-propyl were condensed with hydroxyl azo benzaldehyde. These compounds have been characterized by their spectral data, DSC and HS-POM. These molecules were expected to exhibit liquid crystal phase so that the influence of UV-light on their textures of mesophase could be detected. The results showed that all these target compounds have the temperature range of mesophase between 101 and 145 ℃. After irradiating under UV-light, they exihibited photo-sensitivity not only in methanol but also in mesophase.