82052-56-0Relevant academic research and scientific papers
Core-to-core dimers forming switchable mesophase
Hor?ic,Svoboda,Novotná,Pociecha,Gorecka
supporting information, p. 2721 - 2724 (2017/03/10)
We report structurally new type of dimers composed of bent-core molecules connected through their central cores by an alkylene spacer. Various self-assembling structures are discovered when prolonging the terminal alkyl chains in arms. Among diverse mesop
Phthalonitriles containing ester groups and copper phthalocyanines based on them
Tikhomirova,Maizlish,Shaposhnikov
scheme or table, p. 768 - 772 (2011/08/09)
Phthalonitriles containing ester groups were obtained by acylation of 4-hydroxyphthalonitrile and esterification of 4-(p-carboxyphenyloxy) phthalonitriles. On the basis of these phthalonitriles the respective copper phthalocyanines were synthesized. Spectral and some other physical and chemical properties of the synthesized compounds were investigated.
Synthesis and characterization of symmetrical eight aromatic ring containing bent-shaped material derived from benzophenone
Majumdar,Ghosh,Chakravorty
experimental part, p. 63 - 72 (2011/09/13)
A new family of symmetrical eight aromatic ring-containing bent-shaped mesogens in which the central elbow is a ketone has been synthesized and characterized. The effect of the side chain on the mesomorphism has been studied. All the bent derivatives were found to exhibit mesomorphism. The higher homologues of the series exhibit the B1 phase and the lower homologues of the series show the B6 phase. Copyright Taylor & Francis Group, LLC.
Chiral smectic *C mesogens having ester and amide central linkages
Tandel,Vora
, p. 103 - 116 (2008/09/20)
Ten members of a chiral homologous series 4-(4'-n-alkoxy benzoyloxy benzoyl)4''- S- (+) 2-methyl butoxy anilides were synthesized in multiple step synthesis. Series exhibits chiral smectic *C and cholesteric mesophases. In this series, n-propyl to n-dodecyl derivatives exhibit smectic *C and cholesteric mesophases. n-Tetradecyl and n-hexadecyl derivatives exhibit only smectic *C phases. The plot of transition temperatures versus number of carbon atoms in alkoxy chain exhibits odd-even effect for cholestric-isotropic transition temperatures. The effect of amide linkage and chirality is discussed in detail. High-temperature cholestric phases exhibit vivid colors. Two compounds were analyzed by calorimetric study (C12 and C14) to confirm the transition temperatures of which was observed under polarizing microscope. The mesogenic behavior of the series compared with other series where amide central linkage differs in its position. The mesogenic thermal stability is compared with other related homologous series. The result indicates that amide linkage enhances smectic as well as cholesteric thermal stability but enhancement in smectic phase is much higher. Compounds are characterized by elemental analysis, IR spectral data, Mass spectral data, DSC, NMR, and microscopic study.
4-acyloxy- and 4-acylaminophthalonitriles and phthalocyanines based thereon
Tararykina,Maizlish,Galanin,Shaposhnikov,Bykova,Usol'tseva
, p. 1719 - 1725 (2008/09/18)
Reactions of 4-hydroxy- and 4-aminophthalonitriles with substituted benzoyl chlorides gave the corresponding N- and O-benzoyl derivatives, and the latter were used to obtain copper and nickel phthalocyanine complexes. Effect of the substituents in the latter on their electronic absorption spectra was studied. The obtained complexes were found to undergo association in organic solvents.
Formation of columnar hexagonal mesophases near room temperature from functionalised [9]aneNS2 (1,4-dithia-7-azacyclononane)
Blake,Bruce,Danks,Fallis,Guillon,Ross,Richtzenhain,Schroeder
, p. 1011 - 1018 (2007/10/03)
Oligo(benzoate) derivatives, (R)[9]aneNS2, of 1,4-dithia-7-azacyclononane [R = OC-C6H4-4-OR' (1) [R' = C3H7 (a) C8H17 (b)], OC-C6H4-4-O2C-C6
The Use of Simple Sugars for the Synthesis of Chiral Monophilic Liquid Crystals
Vill, V.,Bachmann, F.,Thiem, J.,Pelyvas, I. F.,Pudlo, P.
, p. 57 - 66 (2007/10/02)
By Ferrier glycosylation of glycals and subsequent hydrogenation 2,3-dideoxyglycosides were obtained.Starting with glucose, xylose or rhamnose this reaction sequence led to thermotropic non-amphiphilic chiral liquid crystals.The synthesized compounds show
Thermal and X-Ray Diffraction Studies of Some Liquid Crystals Having a Nitro Group at the Lateral Position
Takenaka, S.,Sakurai, Y.,Takeda, H.,Kusabayashi, S.,Sugiura, H.,Morita, H.
, p. 59 - 70 (2007/10/02)
3-Nitrophenyl 4-(4-octyloxy- and 4-(4-nonyloxybenzoyloxy)-benzoates (compound 1), 4-(4-octyloxyphenoxycarbonyl)phenyl 3-nitrobenzoate (compound 2), 4-(4-octyloxy- and 4-(4-decyloxybenzoyloxy)phenyl 3-nitrobenzoates (compound 3), and 3-nitrophenyl 4-(4-octyloxy- and 4-(4-nonyloxyphenoxycarbonyl)benzoates (compound 4) have been prepared.All the compounds show smectic A and nematic phases, where the molecular arrangement in the smectic A phase is dependent on the orientation of the ester linkages.The smectic A phase for compounds 1 and 3 has a monolayer rearrangement of the molecules, while the smectic A phase for compound 3 also involves a small contribution of a partially bilayer nature near the smectic A-nematic transition.The smectic A phase for compound 2 has a bilayer arrangement, and compounds 4 probably the bilayer one.A dipole correlation within the smectic A phases has been discussed. - Keywords: polar liquid crystals; smectic A modification; x-ray diffraction; lateral substituent effect.
