申请人:——
公开号:US04457859A1
公开(公告)日:1984-07-03
2,2-azimidazole derivatives of the formula: ##STR1## wherein R and R.sup.1 are H, a C.sub.1 -C.sub.12 alkyl, a C.sub.1 -C.sub.12 alkoxy; NO.sub.2 ; R.sup.2 is hydrogen, a C.sub.1 -C.sub.3 alkyl; n, m=1 to 3, but where n-m=1, R=R.sup.1 =R.sup.2 =H is excluded, are disclosed as well as a method for preparing these compounds by oxidation of a compound of the formula ##STR2## wherein R, R.sup.1, R.sup.2, n and m are as identified above, except for the compound, wherein R=R.sup.2 =R.sup.2 =H, n=m=1. A liquid-crystal or mesomorphic material containing the 2,2'-azoimidazole compounds and electrooptical device comprised of such mesomorphic material are disclosed. The electrooptical devices are useful for systems of electronic representation and processing of information. The compounds therein have two spectrally spaced absorption bands in the visible part of their spectrum such that their position insures the contrast required for the human eye to be able to readily recognize the difference in color.
本发明涉及公式为:##STR1##其中R和R.sup.1是H,C.sub.1-C.sub.12烷基,C.sub.1-C.sub.12烷氧基或NO.sub.2; R.sup.2是氢,C.sub.1-C.sub.3烷基; n,m = 1至3,但当n-m = 1时,排除R = R.sup.1 = R.sup.2 = H的情况。本发明还公开了一种制备这些化合物的方法,即通过氧化公式为##STR2##其中R,R.sup.1,R.sup.2,n和m如上所述,但除了化合物,其中R = R.sup.2 = R.sup.2 = H,n = m = 1。本发明还公开了含有2,2'-偶氮咪唑化合物的液晶或介态材料以及由这种介态材料组成的电光器件。这些电光器件对于信息的电子表示和处理系统非常有用。其中的化合物在其光谱的可见部分具有两个光谱间隔吸收带,使其位置确保人眼能够轻松识别颜色差异所需的对比度。