Dielectric, Raman, calorimetric and X-ray diffraction studies of a polycarbazolyldiacetylene

We report the temperature dependence of the dielectric properties of poly[1 ,6-bis(3,6-didodecyl-N-carbazolyl)-2,4-hexadiyne](polyDCHD-S) from 30 to 40 0 K. The data obtained from these measurements are confirmed, in selected t emperature ranges, by FT-Raman spectroscopy, differential scanning calorime try and X-ray diffraction. The transition from the blue to the red form in polyDCHD-S is detected in correspondence to the monomer melting point (abou t 340 K). Other transitions, above and below this feature, are reported and discussed. (C) 2001 Elsevier Science B.V. All rights reserved.