149365-17-3Relevant articles and documents
Conjugated Schiff's Bases-Synthesis and Preliminary Characterization of 4-(Alkoxycinnamylidene)-4'-Nitroanilines
Lin, Yii-Ren,Hong, Yen-Long V.,Hong, Jin-Long
, p. 69 - 76 (2007/10/02)
Conjugated Schiff's bases (-CH=CH-CH=N-) of 4-(alkoxycinnamylidene)-4'-nitroanilines (AN) were succesfully synthesized by the Wittig reaction.Most of the homologues series exhibit lower clearing temperatures than those reported for the 4-(nitrocinnamylidene)-4'-alkoxyanilines (NA).A plausible reason may be due to the higher extent of non-coplanarity in the AN system than in the NA system.Comparison of the conjugated Schiff's bases with the simple Schiff's bases suggests that the addition of one more double bond increases the phase transition temperatures and stabilities of the mesophases.It seems that the increase of molecular length contributes to these effects. - Keywords: conjugated Schiff's bases, 4-(alkoxycinnamylidene)-4'-nitroanilines, mesophase stability, molecular length
Synthesis of New Liquid Crystalline Compounds based on 1,4-Diarylbuta-1,3-dienes
Brettle, Roger,Dunmur, David A.,Hindley, Nigel J.,Marson, Charles M.
, p. 775 - 782 (2007/10/02)
A group of (E,E)-1,4-diarylbuta-1,3-dienes, substituted in the para-position of one aryl ring by an alkoxy-group and in the para-position of the other aryl group by a cyano- or halogeno-group have been synthesised.The compounds are mesogenic and their phy
New Liquid Crystalline Compounds Based on 1,4-Diarylbuta-1,3-dienes
Brettle, Roger,Dunmur, David A.,Hindley, Nigel J.,Marson, Charles M.
, p. 410 - 411 (2007/10/02)
The first group of fully characterised mesogenic (E,E)-1,4-diarylbuta-1,3-dienes, substituted in the para-position of one aryl ring by an alkoxy-group and in the para-position of the other aryl group by a cyano- or halogeno-group has been prepared by a Wadsworth-Emmons procedure; their physical properties of high birefringence and low viscosity in combination make them particularly suitable for use in liquid crystal display devices when mixed with known liquid crystalline materials.