Solid state films of two urethane polycarbazoldiacetylenes with methylene spacers between the urethane moiety and the diacetylene backbone

摘要

Two urethane carbazolyldiacetylenes,6-(N-Carbazolyl)hexa-2,4-diyn-l-ol-l acetate buthyl urethane and 9-(N-carbazolyl)nona-5,7-diyn-l-ol-acetate buthyl urethane (hereafter named CHBU and CNBU,respectively),which present methylene spacers with different length between the urethane and diacetylene moieties,have been synthesized in order to obtain a conjugated polymer for non linear optics.The UV polymerization is studied by UV-Vis spectroscopy in polymeric films prepared by mechanical alignment of the monomer powder on hot substrates followed by UV polymerization.PolyCHBU films containing residual monomer exhibit thermochromic properties from blue to red form while no spectroscopic changes are observed for the polyCNBU films upon temperature.For polyCHBU,both blue and red films present also optical dichroism as observed by polarized UV-Vis spectroscopy,polarized microscopy and AFM.