A POLYDIACETYLENE FROM AN ASYMMETRICALLY-SUBSTITUTED OCTATETRAYNE COMPOUND FOR NONLINEAR OPTICS

Since solid-state polymerization reaction of symmetrically-substituted octatetrayne derivatives can start from both 1,4- and 5,8-positions i n the same column of the monomers in crystals, deterioration of crysta llinity seemed to occur to some extent in the course of polymerization . Thus, an asymmetrically-substituted octatetrayne, i.e. ,5,6-tetraflu orophenyl)-6,8,10,12-tridecatetraynyl N-(butoxycarbonylmethyl)-carbama te (5BCMU-4A-BTFP), was synthesized and its polymerization site was ex amined using high resolution solid-state (13)CNMR spectroscopy. And it was shown that asymmetrical substitution of octatetrayne is effective for site-selective 1,4-addition polymerization. Absorption spectrum a nd third-order nonlinear optical properties of the 5BCMU-4A-BTFP polym er were also investigated.