Poly 侮 yleneethynylene )type π 一 conjugated po 璽 ymers ( PAEs ) are synthesized and the third − ordel optical susceptib 三 lity ) C ( 3) of their thin films is evaluated . There is a red − shift in the electronic absorption of the PAE caused by an intramolecular charge transfer ( CT > 蝋 eraction when π 一 electron excessive heteroaroma芝 ic rings are in荘oduced . The X ( 3) v 証ue cf the PAEs is enhanced by increasing 耄 he CT interac 丘on and reaches more than 10 ' 11esu in the near resonant reg 量 on

more »

... . The main factor enhancing Z ( 3) is the increase in the π 一 e呈 ectrQn delocalization caused by the CT interaction . 英 文 key words nonlinear optics・ x − conjugated polymer, poly( alyleneethynylene ) , intramolecular charge tran ' sfer