Category: 50670-76-3

Lee, Myongsoo published the artcileInduction of Thermotropic Liquid Crystalline Phases in Coil-Rod-Coil Triblock Molecules Containing Poly(propylene oxide) through Complexation with LiCF₃SO₃, Synthetic Route of 50670-76-3, the publication is Chemistry of Materials (1998), 10(7), 1894-1903, database is CAplus.

The preparation and thermotropic phase behavior of coil-rod-coil triblock mols. of dodecyl 4-(4-oxy-4′-biphenylcarbonyloxy)-4′-biphenylcarboxylate with poly(propylene oxide) of seven (7-22) and twelve (12-22) propylene oxide subunits and the complexes of the triblock mols. with LiCF₃SO₃ are presented. Both 7-22 and 12-22 appear to be crystalline solids. However, the complexation of 7-22 and 12-22 with LiCF₃SO₃ induces an enantiotropic liquid crystalline phase. The complexes of 7-22 with 0.05-0.20 mol of LiCF₃SO₃ per propylene oxide unit exhibit an enantiotropic smectic A mesophase. In contrast, a significant phase change is observed upon complexation of 12-22 with LiCF₃SO₃. The complex of 12-22 with 0.10 mol of LiCF₃SO₃ exhibits a smectic A mesophase. However, the complexes with 0.15-0.30 mol of LiCF₃SO₃ display a hexagonal columnar mesophase. The thermal stability of the mesophase exhibited by the Li complexes based on each triblock mol. increases with increasing salt concentration This behavior is attributed to the dynamics of ionic association resulting from specific interactions between the ether oxygens and the cations. These results, characterized by a combination of techniques consisting of differential scanning calorimetry, thermal optical microscopy, and Raman spectroscopy, are discussed.

Chemistry of Materials published new progress about 50670-76-3. 50670-76-3 belongs to esters-buliding-blocks, auxiliary class Benzene,Phenol,Ester, name is Ethyl 4′-hydroxy-[1,1′-biphenyl]-4-carboxylate, and the molecular formula is C15H14O3, Synthetic Route of 50670-76-3.

Referemce:
https://en.wikipedia.org/wiki/Ester,
Ester – an overview | ScienceDirect Topics

Choi, E-Joon published the artcileDimesogenic compounds with chiral tails. Synthesis and liquid crystalline properties of a homologous series of α,ω-bis[4-(4′-(S)-(-)-2-methylbutoxycarbonyl-biphenyl-4-oxycarbonyl)phenoxy]alkanes, COA of Formula: C15H14O3, the publication is Bulletin of the Korean Chemical Society (2000), 21(1), 110-117, database is CAplus.

A series of new liquid crystalline dimesogenic compounds with chiral tails was synthesized, and their thermal and liquid crystalline properties were studied. The chain length of the central polymethylene spacers (x) was varied from dimethylene (2) to decamethylene (12). These compounds were characterized by elemental anal., IR and NMR spectroscopy, differential scanning calorimetry (DSC), and cross-polarizing microscopy. All compounds were found to be enantiotropically liquid crystalline, and the values of melting (T_m) and isotropization temperature (T_i) as well as enthalpy change (ΔH_i) and entropy change for isotropization (ΔS_i) decreased in a zig-zag fashion revealing the so-called odd-even effect as x increases. Their mesomorphic properties fall into 3 categories depending upon x; (a) compounds with x = 2 and 4 formed two different mesophases, smectic and cholesteric phases in that order on heating, and vice versa on cooling, (b) compounds with x = 3, 7, 8, 10, and 11 reversibly formed only the cholesteric phase, and (c) compounds with x = 5, 6, 9, and 12 exhibited only a cholesteric phase on heating, whereas on cooling they formed 2 different mesophases, cholesteric and smectic phases, sequentially.

Bulletin of the Korean Chemical Society published new progress about 50670-76-3. 50670-76-3 belongs to esters-buliding-blocks, auxiliary class Benzene,Phenol,Ester, name is Ethyl 4′-hydroxy-[1,1′-biphenyl]-4-carboxylate, and the molecular formula is C15H14O3, COA of Formula: C15H14O3.

Referemce:
https://en.wikipedia.org/wiki/Ester,
Ester – an overview | ScienceDirect Topics

Bai, Feng published the artcileSynthesis and Characterization of Isoregic Chiral Smectic Polyesters, Recommanded Product: Ethyl 4′-hydroxy-[1,1′-biphenyl]-4-carboxylate, the publication is Chemistry of Materials (1999), 11(7), 1666-1671, database is CAplus.

We prepared a series of isoregic chiral smectic polyesters based on (R)-(-)-4′-{ω-[2-(p-hydroxy-o-nitrophenyloxy)-1-propoxy]-1-alkyloxy}-4-biphenylcarboxylic acid. The head-to-tail (p-hydroxybenzoic acid) type monomers enable us to proceed the isoregically controlled polycondensation. All the monomers exhibited the chiral smectic C and nematic mesophases. The isoregic chiral smectic polyesters have good thermal stability and exhibit monolayered chiral smectic C and smectic A structures.

Chemistry of Materials published new progress about 50670-76-3. 50670-76-3 belongs to esters-buliding-blocks, auxiliary class Benzene,Phenol,Ester, name is Ethyl 4′-hydroxy-[1,1′-biphenyl]-4-carboxylate, and the molecular formula is C15H14O3, Recommanded Product: Ethyl 4′-hydroxy-[1,1′-biphenyl]-4-carboxylate.

Referemce:
https://en.wikipedia.org/wiki/Ester,
Ester – an overview | ScienceDirect Topics

Chen, Zhen published the artcileA design principle of polymers processable into 2D homeotropic order, Name: Ethyl 4′-hydroxy-[1,1′-biphenyl]-4-carboxylate, the publication is Nature Communications (2016), 13640, database is CAplus and MEDLINE.

How to orient polymers homeotropically in thin films has been a long-standing issue in polymer science because polymers intrinsically prefer to lie down. Here we provide a design principle for polymers that are processable into a 2D homeotropic order. The key to this achievement was a recognition that cylindrical polymers can be designed to possess oppositely directed local dipoles in their cross-section, which possibly force polymers to tightly connect bilaterally, affording a 2D rectangular assembly. With a phys. assistance of the surface grooves on Teflon sheets that sandwich polymer samples, homeotropic ordering is likely nucleated and gradually propagates upon hot-pressing towards the interior of the film. Consequently, the 2D rectangular lattice is constructed such that its b axis (side chains) aligns along the surface grooves, while its c axis (polymer backbone) aligns homeotropically on a Teflon sheet. This finding paves the way to molecularly engineered 2D polymers with anomalous functions.

Nature Communications published new progress about 50670-76-3. 50670-76-3 belongs to esters-buliding-blocks, auxiliary class Benzene,Phenol,Ester, name is Ethyl 4′-hydroxy-[1,1′-biphenyl]-4-carboxylate, and the molecular formula is C15H14O3, Name: Ethyl 4′-hydroxy-[1,1′-biphenyl]-4-carboxylate.

Referemce:
https://en.wikipedia.org/wiki/Ester,
Ester – an overview | ScienceDirect Topics

Ocak, Hale published the artcileTwist grain boundary (TGB) states of chiral liquid crystalline bent-core mesogens, Quality Control of 50670-76-3, the publication is Chemical Communications (Cambridge, United Kingdom) (2015), 51(35), 7512-7515, database is CAplus and MEDLINE.

4-Cyanoresorcinol derived bent-core mols. with a chiral (S)-2-methylbutoxy chain form liquid crystalline phases with TGBA- and TGBC-like structures at the transition from cybotactic nematic via SmA to SmC phases.

Chemical Communications (Cambridge, United Kingdom) published new progress about 50670-76-3. 50670-76-3 belongs to esters-buliding-blocks, auxiliary class Benzene,Phenol,Ester, name is Ethyl 4′-hydroxy-[1,1′-biphenyl]-4-carboxylate, and the molecular formula is C15H14O3, Quality Control of 50670-76-3.

Referemce:
https://en.wikipedia.org/wiki/Ester,
Ester – an overview | ScienceDirect Topics

Ocak, Hale published the artcileEffects of chain branching and chirality on liquid crystalline phases of bent-core molecules: blue phases, de Vries transitions and switching of diastereomeric states, Name: Ethyl 4′-hydroxy-[1,1′-biphenyl]-4-carboxylate, the publication is Soft Matter (2011), 7(18), 8266-8280, database is CAplus.

Bent-core mols. based on a resorcinol bis[benzoate] core with a series of distinct substituents in different positions at the central resorcinol core were synthesized and characterized. The focus is on the effect of branched terminal groups in the racemic and chiral forms on the mesomorphic properties. These were investigated by differential scanning calorimetry, optical polarizing microscopy, X-ray diffraction, electro-optic and dielec. methods. Only bent-core mesogens derived from 4-cyanoresorcinol exhibit liquid crystalline phases and the mesophases of these compounds are strongly influenced by the branching and enantiomeric composition of the terminal chains. Depending on the structure of the rod-like wings and the enantiomeric composition, cybotactic nematic phases (N_cybC), BPIII-like isotropic mesophases (BPIII_cybC*) and various polar and apolar smectic phases (SmA, SmC, SmC*, SmC_sP_A, SmC_sP_A*) are formed. For one compound, a de Vries type smectic phase is observed and it appears that with decreasing temperature, order develops in two steps. First, at the SmA to SmC transition, the tilt direction becomes long range ordered and in a second step a long range ordering in bend direction takes place. Hence, for the optically active compound a transition from chirality induced polar switching to bend induced (shape induced) antiferroelectricity takes place. In this SmC_sP_A* phase a homogeneous layer chirality is induced under an applied elec. field which interacts with the fixed mol. chirality leading to the energetically favored diastereomeric state and giving rise to a field direction dependent uniform tilt director orientation. Field reversal induces a flipping of the layer chirality, which first leads to the less favorable diastereomeric state, and then this slowly relaxes to the more stable one by a spontaneous reversal of the tilt direction. The target compounds thus formed included resorcinol derivatives of racemic 4-(2-methylbutoxy)benzoic acid 4-carboxyphenyl ester, chiral 4-[(2S)-2-methylbutoxy]benzoic acid 4-carboxyphenyl ester, chiral 4-[[(3S)-3,7-dimethyloctyl]oxy]benzoic acid 4-carboxyphenyl ester and racemic [(3,7-dimethyloctyl)oxy]benzoic acid 4-carboxyphenyl ester, etc.

Soft Matter published new progress about 50670-76-3. 50670-76-3 belongs to esters-buliding-blocks, auxiliary class Benzene,Phenol,Ester, name is Ethyl 4′-hydroxy-[1,1′-biphenyl]-4-carboxylate, and the molecular formula is C15H14O3, Name: Ethyl 4′-hydroxy-[1,1′-biphenyl]-4-carboxylate.

Referemce:
https://en.wikipedia.org/wiki/Ester,
Ester – an overview | ScienceDirect Topics

Fernandez-Blazquez, Juan P. published the artcileObservation of Two Glass Transitions in a Thermotropic Liquid-Crystalline Polymer, Category: esters-buliding-blocks, the publication is Macromolecules (2004), 37(24), 9018-9026, database is CAplus.

DSC and real-time variable-temperature synchrotron experiments have been performed on a thermotropic poly(ether-ester), PH31B32, with biphenyl units as mesogens and spacers with Me substituents. It has been found that PH31B32 develops a low-ordered SmCalt mesophase with a rather slow rate of formation in such a way that the isotropic melt of this polymer can be easily quenched into the glassy amorphous state at the usual cooling rates of the calorimeter. Considerably high annealing times at temperatures above T_g are necessary to develop such a mesophase. The extent of transformation and symmetry of the mesophase have been determined by means of calorimetric and X-ray diffraction experiments The DSC results show that the glass-transition temperatures of the amorphous and liquid-crystalline states are clearly different: 95 and 84 °C, resp. Moreover, the results show that the isotropization temperature increases linearly with the annealing temperature (the temperature at which the mesophase has been formed). The synchrotron experiments show that the mesophase layer spacing is slightly lower for the higher annealing temperatures, indicating a slightly more compact structure. Although the WAXS profiles of the two phases (mesophase and amorphous) are rather similar, the mesophase has noticeably smaller most probable intermol. distances and a smaller width of the WAXS broad peak. The temperature coefficients of these intermol. distances are also different for the various phases, and clear discontinuities are observed at the glass transitions. The corresponding values of T_g obtained from these results are 94 and 84 °C for the amorphous and liquid-crystalline phases, resp., in perfect agreement with the DSC results. The correlation lengths estimated from the widths of the mesophase layer peaks are of the order of the extended chain length of the polymer, so that no extensive chain folding seems to be present in the mesophase of PH31B32. This fact will favor the attainment of high degrees of liquid crystallinity. Moreover, the higher correlation lengths deduced for the higher annealing temperatures point to a segregation of defects from the smectic structure in a greater extent, which may explain the corresponding higher isotropization temperatures

Macromolecules published new progress about 50670-76-3. 50670-76-3 belongs to esters-buliding-blocks, auxiliary class Benzene,Phenol,Ester, name is Ethyl 4′-hydroxy-[1,1′-biphenyl]-4-carboxylate, and the molecular formula is C15H14O3, Category: esters-buliding-blocks.

Referemce:
https://en.wikipedia.org/wiki/Ester,
Ester – an overview | ScienceDirect Topics

del Campo, Aranzazu published the artcileAmorphous-smectic glassy main-chain LCPs. 1. Poly(ether esters) derived from hydroxybibenzoic acid and (R,S)- and (R)-2-methylpropane-1,3-diol, Name: Ethyl 4′-hydroxy-[1,1′-biphenyl]-4-carboxylate, the publication is Macromolecular Chemistry and Physics (2002), 203(17), 2508-2515, database is CAplus.

The synthesis and the characterization of main-chain liquid-crystalline poly(ether esters), derived from hydroxybibenzoic acid and (R,S)- and (R)-2-methylpropane-1,3-diol, are reported. These polymers show an interesting thermal behavior. They develop mesophases with a slow rate of formation, allowing the easy quenching of the melt into: a) the glassy amorphous state, b) the glassy liquid-crystalline state, or c) a mixture of both, depending on the thermal treatment. The extent of the transformation and the symmetry of the different phases have been determined by means of calorimetric and X-ray diffraction methods. Dielec. spectroscopy results provide addnl. evidence for the detection of distinct glass transitions. The results show that the racemic polymer forms a low-ordered SmC_alt mesophase, while a more ordered phase is obtained in the case of the enantiomerically pure polymer. The comparison of the properties of the different states evidences the special behavior and properties of the glass transition (T_g) in these polymers. Emphasis is paid to the location of the T_g of the liquid-crystalline state in comparison to the T_g of the amorphous state. It is found that the glass transition of the SmC_alt glass in R,S-PBO3 (the poly(ether ester) derived from hydroxybibenzoic acid and (R,S)-2-methylpropane-1,3-diol) appears at lower temperatures than the glass transition of the amorphous state. However, in R-PBO3 (the poly(ether ester) derived from hydroxybibenzoic acid and (R)-2-methylpropane-1,3-diol), where the more ordered phase is present, the glass transition follows the classical tendency of semicrystalline polymers.

Macromolecular Chemistry and Physics published new progress about 50670-76-3. 50670-76-3 belongs to esters-buliding-blocks, auxiliary class Benzene,Phenol,Ester, name is Ethyl 4′-hydroxy-[1,1′-biphenyl]-4-carboxylate, and the molecular formula is C15H14O3, Name: Ethyl 4′-hydroxy-[1,1′-biphenyl]-4-carboxylate.

Referemce:
https://en.wikipedia.org/wiki/Ester,
Ester – an overview | ScienceDirect Topics

Honglawan, Apiradee published the artcilePillar-Assisted Epitaxial Assembly of Toric Focal Conic Domains of Smectic-A Liquid Crystals, Product Details of C15H14O3, the publication is Advanced Materials (Weinheim, Germany) (2011), 23(46), 5519-5523, database is CAplus and MEDLINE.

The authors demonstrated epitaxial assembly of SmA LCs using top-down fabricated polymer pillar arrays. The 3-dimensional nature of the pillar array is crucial to confine and direct the formation of toric focal conic domains on the top of each pillar as well as between neighboring pillars. Independent of LC thickness (above a critical thickness hc), the pattern of SU-8 pillar arrays determined the final crystal habit of the toric focal conic domain array (TFCD): both highly ordered square and hexagonal array of TFCDs were obtained. The epitaxial approach presented here offers an entirely new and promising organizational principle for smectic LC systems using simple topog. substrates. In turn, it may give more complex LC phases in 3-dimensional that are critical to the advancement of LC-based electronic and optical devices,’25,26′ and perhaps generation of novel materials when incorporating functional units such as nanoparticles, nanocrystals, and carbon nanotubes into the LC layers.

Advanced Materials (Weinheim, Germany) published new progress about 50670-76-3. 50670-76-3 belongs to esters-buliding-blocks, auxiliary class Benzene,Phenol,Ester, name is Ethyl 4′-hydroxy-[1,1′-biphenyl]-4-carboxylate, and the molecular formula is C15H14O3, Product Details of C15H14O3.

Referemce:
https://en.wikipedia.org/wiki/Ester,
Ester – an overview | ScienceDirect Topics

Zhang, Yongqiang published the artcileAchiral Bent-Core Molecules with a Series of Linear or Branched Carbosilane Termini: Dark Conglomerate Phases, Supramolecular Chirality and Macroscopic Polar Order, Product Details of C15H14O3, the publication is Chemistry of Materials (2010), 22(9), 2869-2884, database is CAplus.

New organic-inorganic hybrid materials that combine a bent π-conjugated aromatic core with one linear or branched carbosilane unit have been synthesized and investigated, with respect to their self-assembly in liquid crystalline (LC) phases, by means of polarizing microscopy, differential scanning calorimetry (DSC), X-ray diffraction (XRD), and electro-optical techniques. Most of these achiral compounds show spontaneous symmetry breaking into chiral superstructures that represent conglomerates with macroscopic domains of opposite handedness. These fluid chiral superstructures can be frozen into the glassy state and, for one of the compounds, chirality was switched under the application of a special waveform of an applied external elec. field between two enantiomeric states. This flipping of supramol. chirality occurs between oppositely tilted structures, which represents a new mode of chirality switching. Besides spontaneous chirality, these materials show polar order, leading to ferroelec. (FE) and antiferroelec. (AF) switching modes. For one compound with a highly branched carbosilane unit, a temperature-, voltage-, and frequency-dependent reversible transition from AF switching with inversion of chirality to FE switching with retention of chirality was observed Models were developed to explain the exptl. observations, based on enthalpic and entropic contributions of distinct supermol. arrangements in these soft matter systems.

Chemistry of Materials published new progress about 50670-76-3. 50670-76-3 belongs to esters-buliding-blocks, auxiliary class Benzene,Phenol,Ester, name is Ethyl 4′-hydroxy-[1,1′-biphenyl]-4-carboxylate, and the molecular formula is C7H3BrF3I, Product Details of C15H14O3.

Referemce:
https://en.wikipedia.org/wiki/Ester,
Ester – an overview | ScienceDirect Topics