Raman signature of the side-group dynamics in a monomer diacetylene crystal, pTS-D

✍ Scribed by M. Bertault; J. Even; A. Girard; Y. Délugeard

• Publisher: John Wiley and Sons
• Year: 1996
• Tongue: English
• Weight: 299 KB
• Volume: 6
• Category: Article
• ISSN: 1616-301X
• DOI: 10.1002/(sici)1099-0712(199609)6:5/6<317::aid-amo251>3.0.co;2-u

✦ Synopsis

Raman scattering is used to make a dynamical study of the disubstituted and perdeuterated diacetylene pTS-D in monomer crystal from, where an incommensurate phase exists from T, = 155 K to r; = 195 K. The low-frequency polarised Raman spectra in the temperature interval 9-300 K show that the phase transition is related to side-group rotations decoupled as from the diacetylene backbone, as in pTS-D polymer. A comparison with another disubstituted diacetylene DNP shows that it is very difficult to obtain symmetrical diacetylene polymers in a non-centrosymmetric structure.