89027-83-8

Upstream product

• 693-58-3 1-Bromononane 
• 95-01-2 2,4-Dihydroxybenzaldehyde 

Downstream Products

• 927814-10-6 4-{[2-hydroxy-4-(nonyloxy)benzylidene]amino}benzoic acid 

Relevant academic research and scientific papers

Development of nematic and orthogonal smectic phases in short-core fluorinated hockey-stick shaped liquid crystal compounds

Here we report synthesis and investigations on novel short-core hockey-stick shaped molecules bearing a 4-n-alkyloxy-2-hydroxybenzylidene moiety at one end and polar fluoro-biphenyl moiety at the other end. The polar chloro and fluoro substituent at the lateral position of the core confers nematic and orthogonal smectic mesomorphism. The mesophase morphology is characterized by polarizing optical microscopy (POM), differential scanning calorimetry (DSC), X-ray diffraction (XRD), electro-optical study and dielectric spectroscopy. The fluorinated compounds 1b (n = 16) and 1c (n = 18) have long terminal hydrocarbon tail and show orthogonal smectic phases with antiferroelectric switching behaviour. The chlorinated compound 2e (n = 8) with relatively short terminal chain length exhibits only a monotropic nematic phase on cooling. The nematic phase is comprised of cybotactic clusters as confirmed by XRD and exhibits electro-optic switching. The compound 2i (n = 12) manifests a short range enantiotropic nematic and additional orthogonal smectic phase. Dielectric spectroscopy reveals polar correlations in the nematic and smectic phases.

Nematic phases in achiral unsymmetrical four-ring bent-core azo compounds possessing strongly polar cyano and nitro moieties as end substituents: Synthesis and characterization

Achiral unsymmetrical four-ring bent-core liquid crystals with strongly polar cyano and nitro moieties as substituents at one end and alkyloxy group (butyl to dodecyl) at the other end have been synthesized by a simple and straight forward synthetic method. The four phenyl rings are connected through azo, ester and imine linkages respectively and bent unit is derived from 3-aminobenzoicacid with 2-methyl substituent in the transverse direction of the molecule. The molecular structure characterization is consistent with elemental and spectroscopic analysis data. The materials thermal behaviour and phase characterization have been investigated by differential scanning calorimetry and polarizing optical microscopy. All the compounds exhibit enantiotropic nematic phase over a wide temperature range. The light induced cis-trans isomerization is also discussed.

A bow-phase mesogen showing strong, robust analog electro-optics

The design and synthesis of the first of a new class of bow-phase (also known as banana-phase) mesogens possessing resorcylidene aniline groups in the core is described. The new achiral material, NORABOW, shows two chiral electro-optically active smectic phases, both existing over a wide temperature range. The high temperature smectic, which exists as the thermodynamically stable phase between 120°C and 150°C, exhibits electro-optic behavior not previously reported for a bow-phase. In particular, high susceptibility analog electro-optics ("V-shaped switching") are observed in a texture which is stable to large applied electric fields. The electro-optic behavior of NORABOW is of potential utility in photonic switching applications.

Rare-earth-containing magnetic liquid crystals

Rare-earth-containing metallomesogens with 4-alkoxy-N-alkyl-2- hydroxybenzaldimine ligands are reported. The stoichiometry of the complexes is [Ln(LH)3(NO3)3], where Ln is the trivalent rare-earth ion (Y, La, and Pr to Lu, except Pm) and LH is the Schiff base. The Schiff base ligands are in the zwitterionic form and coordinate through the phenolic oxygen only. The three nitrate groups coordinate in a bidentate fashion. The X-ray single- crystal structures of the nonmesogenic homologous complexes [Ln(LH)3(NO3)3], where Ln = Nd(III), Tb(III), and Dy(III) and LH = CH3OC6H3(2-OH)CH=NC4H9, are described. Although the Schiff base ligands do not exhibit a mesophase, the metal complexes do (SmA phase). The mesogenic rare-earth complexes were studied by NMR, IR, EPR, magnetic susceptibility measurements, X-ray diffraction, and molecular modeling. The metal complexes in the mesophase have a very large magnetic anisotropy, so that these magnetic liquid crystals can easily be aligned by an external magnetic field.

Liquid Crystalline Properties of o-Hydroxy Substituted Schiff's Bases and their Copper (II) and Palladium (II) Complexes

The synthesis and liquid crystalline properties of thirty nine compounds are reported.These include a homologous series of N-(2-hydroxy-4-n-alkoxybenzylidene)-4''-n-dodecylphenylanilines and their corresponding copper (II) and palladium (II) complexes.Differential scanning calorimetry and optical microscopy were used to characterise the mesophases.The Schiff's bases exhibit polymesomorphism while their metal chelates basically show smetic A (SA) and smetic C (SC) phases except for a few derivatives.The transition temperatures of the metal chelates are considerably higher than the ligands from which they are derived.A comparison of the mesomorphic properties of the copper chelates with those of biscopper (II) complexes have also been made.Though the melting points of copper (II) and their corresponding palladium (II) chelates of many homologues are comparable, the clearing points of the latter are consistently higher. - Keywords: Schiff's bases, chelates, smectic A, smectic C

Synthesis and Properties of Thermotropic Liquid Crystals with Two Non-Mesogenic Units and a Flexible Central Spacer

The synthesis of new di-Schiff bases with two non-mesogenic units and a flexible central spacer (-CH2-CH2-) in their structure is reported.The mesomorphic properties of the compounds were investigated by differential scanning calorimetry (DSC) and polariz