| 摘要 |
<p>Materials active in nonlinear optics exhibiting very good filmogibility and a high optical activity. This material has a unit of the following formula: …<IMAGE>… in which:… - R1 and R2, which are identical or different, denote a linear or branched methylene chain containing 2 to 6 carbon atoms… - R3 is an aliphatic, aromatic or arylaliphatic hydrocarbon radical… - R4 and R5, which are identical or different, denote a nitrogen atom or the (CH) group… - Z1 and Z2, which are identical or different, denote an aromatic group containing at least one substituent R7 other than the radical A… - A denotes an electron-accepting group, it being possible for the radical Z2 to carry a number of groups A.</p> |
