(i) A compound of the formula:
wherein R is H, a metal or a group containing a tetravalent
N atom;
R' is N02. CN or COOY;
Y is H C1-4-alkyl, a metal or a group containing a tetravalent N atom;
R2 & R3 are each independently H or a non-hydrophilic aliphatic or cycloaliphatic group containing up to 30 carbon atoms;
R4 & R5 are each independently H or a non-hydrophilic aliphatic or cycloaliphatic group containing up to 30 carbon atoms;
and R6 & R7 are each independently H or a non-hydrophilic group containing up to 4 carbon atoms;
or R4 & R6 together comprise ring fused to Ring A and R5
& R7 are as hereinbefore defined;
or R5 & R7 together comprise ring fused to Ring A and R4
& R6 are as hereinbefore defined;
or R2 & R4 together with the N atom te which R2 is attached form a ring fused to Ring A and R3 & R5 are as hereinbefore defined;
or R3 & R5 together with the N atom to which R3 is attached form a ring fused to Ring A and R2 & R4 are as hereinbefore defined;
provided there are, in total, from 8 to 40 carbon atoms in one or two of the groups independently represented by R2.
R3, R4 & R5;
(ii) an optical element comprising a compound of Formula I having non-linear optical (NLO) properties for use in the generation of NLO signals.
(iii) a method of preparation of such an optical element comprising a plurality of monomolecular layers of the compound of Formula I on the surface of a transparent or reflecting substrate by a Langmuir-Blodgett technique: and
(iv) an optical device incorporating such an optical element.
(i) 式中化合物:
其中 R 是 H、
金属或含有四价原子的基团
N 原子的基团;
R' 是 N02。CN或COOY;
Y 是 H C1-4-烷基、
金属或含有四价 N 原子的基团;
R2 和 R3 各自独立地为 H 或含有多达 30 个碳原子的非亲
水脂肪族或环脂族基团;
R4和R5各自独立地为H或含有多达30个碳原子的非亲
水脂肪族或环脂族基团;
R6和R7各自独立地为H或含有多达4个碳原子的非亲
水基团;
或 R4 和 R6 共同组成与环 A 融合的环,且 R5
和 R7 如前定义;
或 R5 和 R7 一起组成与环 A 融合的环,且 R4
和 R6 如前定义;
或 R2 和 R4 与 R2 所连接的 N 原子一起构成与环 A 融合的环,且 R3 和 R5 如前定义
或 R3 和 R5 与 R3 所连接的 N 原子一起形成与环 A 融合的环,且 R2 和 R4 如前定义;
条件是由 R2 独立代表的一个或两个基团中总共有 8 至 40 个碳原子。
R3、R4 和 R5 所独立代表的一个或两个基团中总共有 8 至 40 个碳原子;
(ii) 一种光学元件,包含具有非线性光学(NLO)特性的式 I 化合物,用于产生 NLO 信号。
(iii) 一种制备这种光学元件的方法,该光学元件包括通过朗缪尔-布洛杰特技术在透明或反射基底表面上形成的多层式 I 化合物单分子层:以及
(iv) 包含这种光学元件的光学设备。