Tag: M.W=200-250

Lakshmi, Dhana published the artcileElectrochemical Sensor for Catechol and Dopamine Based on a Catalytic Molecularly Imprinted Polymer-Conducting Polymer Hybrid Recognition Element, Recommanded Product: Benzyl diethylcarbamodithioate, the publication is Analytical Chemistry (Washington, DC, United States) (2009), 81(9), 3576-3584, database is CAplus and MEDLINE.

One of the difficulties with using molecularly imprinted polymers (MIPs) and other elec. insulating materials as the recognition element in electrochem. sensors is the lack of a direct path for the conduction of electrons from the active sites to the electrode. The authors have sought to address this problem through the preparation and characterization of novel hybrid materials combining a catalytic MIP, capable of oxidizing the template, catechol, with an elec. conducting polymer. In this way a network of “mol. wires” assists in the conduction of electrons from the active sites within the MIP to the electrode surface. This was made possible by the design of a new monomer that combines orthogonal polymerizable functionality; comprising an aniline group and a methacrylamide. Conducting films were prepared on the surface of electrodes (Au on glass) by electropolymerization of the aniline moiety. A layer of MIP was photochem. grafted over the polyaniline, via N,N’-diethyldithiocarbamic acid benzyl ester (iniferter) activation of the methacrylamide groups. Detection of catechol by the hybrid-MIP sensor was specific, and catechol oxidation was detected by cyclic voltammetry at the optimized operating conditions: potential range -0.6 V to +0.8 V (vs. Ag/AgCl), scan rate 50 mV/s, PBS pH 7.4. The calibration curve for catechol was linear to 144 μM, with a limit of detection of 228 nM. Catechol and dopamine were detected by the sensor, whereas analogs and potentially interfering compounds, including phenol, resorcinol, hydroquinone, serotonin, and ascorbic acid, had minimal effect (≤3%) on the detection of either analyte. Non-imprinted hybrid electrodes and bare gold electrodes failed to give any response to catechol at concentrations below 0.5 mM. Finally, the catalytic properties of the sensor were characterized by chronoamperometry and were consistent with Michaelis-Menten kinetics.

Analytical Chemistry (Washington, DC, United States) published new progress about 3052-61-7. 3052-61-7 belongs to esters-buliding-blocks, auxiliary class Amine,Benzene,Amide, name is Benzyl diethylcarbamodithioate, and the molecular formula is C12H17NS2, Recommanded Product: Benzyl diethylcarbamodithioate.

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

Lupo, Cristina published the artcileA microcalorimetric and microscopic strategy to assess the interaction between dietary fibers and small molecules, Related Products of esters-buliding-blocks, the publication is Carbohydrate Polymers (2022), 119229, database is CAplus and MEDLINE.

The interaction between small mols. and neutral soluble dietary fiber is one of the proposed mechanisms determining the bioavailability of these components in the small intestine. However, the weak nature of these interactions makes it difficult to find an anal. method sensitive enough to detect them. Here, we probed the mol. interaction between galactomannan, arabinoxylan, and β-glucan with gallic acid, cinnamic acid, acetylsalicylic acid, and acetaminophen, using advanced anal. methods, namely isothermal titration calorimetry (ITC) and in the form of gold-nanoparticles, transmission electron microscopy (TEM). The results obtained from ITC anal. were fully consistent with the results obtained from TEM. In short, the interaction of these fibers and small mols. was mainly entropically driven, hence involving hydrophobic type association and possible conformational changes of the polysaccharide. However, the enthalpy contribution (hydrogen interaction) is also significant, especially regarding interactions with the acetylsalicylic acid mol.

Carbohydrate Polymers published new progress about 121-79-9. 121-79-9 belongs to esters-buliding-blocks, auxiliary class Natural product, name is Propyl 3,4,5-trihydroxybenzoate, and the molecular formula is C10H12O5, Related Products of esters-buliding-blocks.

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

Tom, Jessica C. published the artcileOptimisation of surface-initiated photoiniferter-mediated polymerisation under confinement, and the formation of block copolymers in mesoporous films, Category: esters-buliding-blocks, the publication is Polymers (Basel, Switzerland) (2017), 9(10), 539/1-539/21, database is CAplus and MEDLINE.

Nature as the ultimate inspiration can direct, gate, and selectively transport species across channels to fulfill a specific targeted function. Harnessing such precision over local structure and functionality at the nanoscale is expected to lead to indispensable developments in synthetic channels for application in catalysis, filtration and sensing, and in drug delivery. By combining mesoporous materials with localized charge-switchable poly(2-(dimethylamino)ethyl methacrylate) (PDMAEMA) brushes, precisely controlling pore filling and exploring the possibility of incorporating two different responsive polymers, we hope to approach the precision control of natural systems in the absence of an external force. Here, we report a simple one-step approach to prepare a mesoporous silica thin film with ~8 nm pores functionalized with a photoiniferter by combining sol-gel chem. and evaporation-induced self-assembly (EISA). We show that surface-initiated photoiniferter-mediated polymerization (SI-PIMP) allows the incorporation of a high polymer content up to geometrical pore blocking by the simple application of UV light in the presence of a monomer and solvent, proceeding in a controlled manner in pore sizes below 10 nm, with the potential to tune the material properties through the formation of surface-grafted block copolymers.

Polymers (Basel, Switzerland) published new progress about 3052-61-7. 3052-61-7 belongs to esters-buliding-blocks, auxiliary class Amine,Benzene,Amide, name is Benzyl diethylcarbamodithioate, and the molecular formula is C6H10F3NO, Category: esters-buliding-blocks.

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

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

Charmillot, P. J. published the artcileThe influence of sex gland components on mating by the summerfruit tortrix moth, Adoxophyes orana, in the laboratory, Formula: C14H26O2, the publication is Entomologia Experimentalis et Applicata (1985), 39(3), 233-9, database is CAplus.

Couples of A. orana were isolated for 1 wk in small 1.25 L rearing boxes in the laboratory with sex gland components deposited on rubber caps. At the end of the trails females were dissected and spermatophores counted. Reduction of mating increased with the dose of a mixture of the attractant components Z-9-tetradecenyl acetate  [16725-53-4] and Z-11-tetradecenyl acetate  [20711-10-8] (9:1), but decreased with increasing d. of 1-5, 10 and 20 couples per box. Each of the attractant components alone produced a mating inhibition equal to the mixture The minor components Z-9-dodecenyl acetate  [16974-11-1] and dodecyl acetate  [112-66-3] had approx. the same effect as the main components, but tetradecyl acetate  [638-59-5] and Z-11-tetradecenyl alc.  [34010-15-6] had no effect. Identical trials conducted on a strain of summerfruit moth newly introduced to rearing showed that 10 times less product was needed to achieve the same degree of mating inhibition as with the old strain. With adaptation to laboratory conditions the proportion of unmated females diminished and repeated matings occurred more frequently. To achieve meaningful results one must work with material from regularly renewed rearings, or better with the direct descendants of individuals from orchards. The results are discussed in relation to mating disruption of A. orana in orchards.

Entomologia Experimentalis et Applicata published new progress about 16974-11-1. 16974-11-1 belongs to esters-buliding-blocks, auxiliary class Aliphatic Chain, name is (Z)-Dodec-9-en-1-yl acetate, and the molecular formula is C14H26O2, Formula: C14H26O2.

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

Whittle, C. P. published the artcileThe sex pheromone and taxonomic status of Homona spargotis Meyrick sp. rev., an Australian pest species of the Coffearia group (Lepidoptera:Tortricidae:Torticinae), Category: esters-buliding-blocks, the publication is Journal of the Australian Entomological Society (1987), 26(2), 169-79, database is CAplus.

A tortricid pest of avocado in Australia, previously thought to be H. coffearia (Nietner), is shown by pheromone anal. and taxonomic re-examination to be a distinct species; the name Homona spargotis Meyrick is reinstated for it. Adults and genitalia of each sex are figured for both species. The genitalia of the true H. coffearia are illustrated apparently for the first time. Australia is now excluded from the known range of H. coffearia.

Journal of the Australian Entomological Society published new progress about 16974-11-1. 16974-11-1 belongs to esters-buliding-blocks, auxiliary class Aliphatic Chain, name is (Z)-Dodec-9-en-1-yl acetate, and the molecular formula is C17H19N3O6, Category: esters-buliding-blocks.

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

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