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Based on an analysis of the ~1H NMR,FT-IR,UV-vis spectra,a chiral trimeric phenylene vinylene derivative(ChTPV) synthesized by a Wittig reaction was determined to have a trans-cis configuration, and it could be isomerized to the trans-trans isomer when treated with iodine.The melting point of ChTPV with a trans-trans configuration increased by 162.1℃compared to the trans-cis isomer,and the ChTPV with trans-trans configuration exhibited the typical liquid-crystalline texture of the smectic A in the heating process.The results indicated that the molecular configuration can influence the formation of the liquid crystalline phase of ChTPV.
Based on an analysis of the ~ 1H NMR, FT-IR, UV-vis spectra, a chiral trimeric phenylene vinylene derivative (ChTPV) synthesized by a Wittig reaction was determined to have a trans-cis configuration, and it could be isomerized to the trans-trans isomer when treated with iodine. The melting point of ChTPV with a trans-trans configuration increased by 162.1 ° C compared to the trans-cis isomer, and the ChTPV with trans-trans configuration exhibited the the typical liquid-crystalline texture of the smectic A in the heating process. The results indicated that the molecular configuration can influence the formation of the liquid crystalline phase of ChTPV.