13224-40-3Relevant articles and documents
4-Methylresorcinol based bent-core liquid crystals with azobenzene wings-a new class of compounds with dark conglomerate phases
Alaasar, Mohamed,Prehm, Marko,Brautzsch, Marcel,Tschierske, Carsten
supporting information, p. 5487 - 5501 (2014/07/08)
Stochastic achiral symmetry breaking in soft matter systems, leading to conglomerates of macroscopically chiral domains (so-called dark conglomerate = DC phases) is of contemporary interest from a fundamental scientific point of view as well as for numero
Reentrant SmCPA phases: Unusual polymorphism variant SmA-SmCSPA-Colob-SmCSPA observed in new bent-core mesogens
Shreenivasa Murthy,Bodyagin,Diele,Baumeister,Pelzl,Weissflog
, p. 1634 - 1643 (2007/10/03)
A new homologous series of achiral five-ring bent-core mesogens is presented. The mesophase behaviour has been studied by polarizing microscopy, differential scanning calorimetry, X-ray diffraction and electro-optical measurements. The homologues with shorter terminal chains (C8, C 12) form an SmCPA phase, homologues with longer chains (C14, C16, C18) show liquid-crystalline tetramorphism with a sequence SmA-SmCSPA-Col ob-SmCSPA. The SmCPA phases are structurally identical and differ only in the mechanism of polar switching. The switching of the high-temperature SmCSPA phase takes place through the collective rotation of the molecules around their long axes whereas in the reentrant SmCSPA phase the switching is based on the director rotation around the tilt cone. By the application of an electric field the Colob phase can be irreversibly transformed to an SmCP A phase. In a limited temperature range the SmA phase shows a reversible field-induced transition into the SmCSPF phase. The electro-optical response of the mesophases is discussed on the basis of the structural features of these phases. The Royal Society of Chemistry 2006.
Design and synthesis of a novel wing shaped achiral antiferroelectric liquid crystal
Kumar,Pisipati
, p. 147 - 160 (2007/10/03)
A novel wing shaped achiral antiferroelectric liquid crystalline compound, 1,3-phenylene bis-[phenylene-1-biphenyldicarboxylato)-3-(4-n-tetradecyloxybenzoyl)biphenyl dicarboxylate] (abbreviated as PBPBTB), having 1,3-phenylene [4-biphenyldicarboxylate-(4-n-tetradecyloxy benzoate)] units as wings, has been synthesized while its liquid crystalline behaviour is characterized by thermal microscopy (TM), differential scanning calorimetry (DSC), spontaneous polarization (Ps) and response times (τ) studies. The preliminary investigations on the ferroelectric properties of the present material show the presence of an antiferroelectric phase.