Tag: M.W=200-250

Mushtaq, Muhammad published the artcileComposite Cathode Architecture with Improved Oxidation Kinetics in Polymer-Based Li-O2 Batteries, Synthetic Route of 143-24-8, the main research area is cathode oxidation kinetics polymer electrolyte lithium ion battery safety; composite cathode lithium ion battery oxidation kinetics; Li−oxygen battery; composite cathode; hexamethylphosphoramide; oxidation kinetics; polymer electrolyte.

The Li-O2 battery based on the polymer electrolyte has been considered as the feasible solution to the safety issue derived from the liquid electrolyte. However, the practical application of the polymer electrolyte-based Li-O2 battery is impeded by the poor cyclability and unsatisfactory energy efficiency caused by the structure of the porous cathode. Herein, an architecture of a composite cathode with improved oxidation kinetics of discharge products was designed by an in situ method through the polymerization of the electrolyte precursor for the polymer-based Li-O2 battery. The composite cathode can provide sufficient gas diffusion channels, abundant reaction active sites, and continuous pathways for ion diffusion and electron transport. Furthermore, the oxidation kinetics of nanosized discharge products formed in the composite cathode can be improved by hexamethylphosphoramide during the recharge process. The polymer-based Li-O2 batteries with the composite cathode demonstrate highly reversible capacity when fully charged and a long cycle lifetime under a fixed capacity with low overpotentials. Moreover, the interface contact between hexamethylphosphoramide and the Li metal can be stabilized simultaneously. Therefore, the composite cathode architecture designed in this work shows a promising application in high-performance polymer-based Li-O2 batteries.

ACS Applied Materials & Interfaces published new progress about Battery cathodes. 143-24-8 belongs to class ethers-buliding-blocks, name is 2,5,8,11,14-Pentaoxapentadecane, and the molecular formula is C10H22O5, Synthetic Route of 143-24-8.

Referemce:
Ether – Wikipedia,
Ether | (C2H5)2O – PubChem

Zhou, Xuan published the artcileEvaluation of Computational Chemistry Methods for Predicting Redox Potentials of Quinone-Based Cathodes for Li-Ion Batteries, Safety of 2,5,8,11,14-Pentaoxapentadecane, the main research area is quinone cathode lithium ion battery redox potential computational chem.

High-throughput computational screening (HTCS) is an effective tool to accelerate the discovery of active materials for Li-ion batteries. For the evaluation of organic cathode materials, the effectiveness of HTCS depends on the accuracy of the employed chem. descriptors and their computing cost. This work was focused on evaluating the performance of computational chem. methods, including semi-empirical quantum mechanics (SEQM), d.-functional tight-binding (DFTB), and d. functional theory (DFT), for the prediction of the redox potentials of quinone-based cathode materials for Li-ion batteries. In addition, we evaluated the accuracy of three energy-related descriptors: (1) the redox reaction energy, (2) the LUMO (LUMO) energy of reactant mols., and (3) the HOMO (HOMO) energy of lithiated product mols. Among them, the LUMO energy of the reactant compounds, regardless of the level of theory used for its calculation, showed the best performance as a descriptor for the prediction of exptl. redox potentials. This finding contrasts with our earlier results on the calculation of quinone redox potentials in aqueous media for redox flow batteries, for which the redox reaction energy was the best descriptor. Furthermore, the combination of geometry optimization using low-level methods (e.g., SEQM or DFTB) followed by energy calculation with DFT yielded accuracy as good as the full optimization of geometry using the DFT calculations Thus, the proposed calculation scheme is useful for both the optimum use of computational resources and the systematic generation of robust calculation data on quinone-based cathode compounds for the training of data-driven material discovery models.

Batteries (Basel, Switzerland) published new progress about Battery cathodes. 143-24-8 belongs to class ethers-buliding-blocks, name is 2,5,8,11,14-Pentaoxapentadecane, and the molecular formula is C10H22O5, Safety of 2,5,8,11,14-Pentaoxapentadecane.

Referemce:
Ether – Wikipedia,
Ether | (C2H5)2O – PubChem

Li, Jiade published the artcileEffect of O2 adsorption on the termination of Li-O2 batteries discharge, COA of Formula: C10H22O5, the main research area is oxygen adsorption termination lithium batteries discharge.

Li-O (Li-O2) batteries can exhibit high theor. energy d. and be surely suitable for potential energy storage. However, they suffer from early discharge termination and consequently low practical capacity, which was regarded as the blockage of the diffusion of O and the electron transfer on cathode surface. Herein, based on exptl. results and theor. simulation, the discharge termination is largely caused by the surface adsorption of O and the corresponding reaction intermediates. A TiO2-coated binder-free C paper was prepared and used as cathode for Li-O2 battery. During the 1st discharge, the discharge plateau at ∼2.55 V was not observed due to the weak adsorption of O on TiO2 surface, indicative of an early discharge termination of Li-O2 battery. It is further identified that the formed vacancies on TiO2 surface during lithiation/delithiation prevents the early discharge termination. Therefore, the interaction between O and electrode surface plays a key role in discharge termination mechanism of Li-O2 batteries.

Electrochimica Acta published new progress about Battery cathodes. 143-24-8 belongs to class ethers-buliding-blocks, name is 2,5,8,11,14-Pentaoxapentadecane, and the molecular formula is C10H22O5, COA of Formula: C10H22O5.

Referemce:
Ether – Wikipedia,
Ether | (C2H5)2O – PubChem

Plunkett, Samuel T. published the artcileA New Cathode Material for a Li-O2 Battery Based on Lithium Superoxide, Recommanded Product: 2,5,8,11,14-Pentaoxapentadecane, the main research area is lithium oxygen battery cathode lithium superoxide.

Li-O2 batteries suffer from large charge overpotentials due to the high charge transfer resistance of Li2O2 discharge products. A potential solution to this problem is the development of LiO2-based batteries that possess low charge overpotentials due to the lower charge transfer resistance of LiO2. In this report, IrLi nanoparticles were synthesized and implemented for the first time as a LiO2 battery cathode material. The IrLi nanoparticle synthesis was achieved by a temperature- and time-optimized thermal reaction between a precise ratio of iridium nanoparticles and lithium metal. Li-O2 batteries employing the IrLi-rGO cathodes were cycled up to 100 cycles at moderate current densities with sustained low cell charge potentials (<3.5 V). Various characterization techniques, including SEM, DEMS, TEM, Raman, and titration, were used to demonstrate the LiO2 discharge product and the absence of Li2O2. On the basis of first-principles calculations, it was concluded that the formation of crystalline LiO2 can be stabilized by epitaxial growth on the (111) facets of IrLi nanoparticles present on the cathode surface. These findings demonstrate that, in addition to the previously studied Ir3Li intermetallic, the IrLi intermetallic also provides a means by which LiO2 discharge products can be stabilized and confirms the importance of templating for the formation process. ACS Energy Letters published new progress about Battery cathodes. 143-24-8 belongs to class ethers-buliding-blocks, name is 2,5,8,11,14-Pentaoxapentadecane, and the molecular formula is C10H22O5, Recommanded Product: 2,5,8,11,14-Pentaoxapentadecane.

Referemce:
Ether – Wikipedia,
Ether | (C2H5)2O – PubChem

Alonso Doval, David published the artcileIncreasingly twisted push-pull oligothiophenes and their planarization in confined space, Application In Synthesis of 596819-12-4, the publication is Organic & Biomolecular Chemistry (2013), 11(43), 7467-7471, database is CAplus and MEDLINE.

A series of systematically deplanarized push-pull oligothiophenes is designed and synthesized to determine the perfect twist for maximal spectroscopic response to their planarization within lipid bilayer membranes. Weak deplanarization naturally gives weak shifts, but strong deplanarization also gives weak shifts because planarization becomes impossible. Intermediate deplanarization turns out to be ideal. The shifts found in response to chromophore planarization are not as dramatic as with lobsters during cooking but sufficient to discriminate solid-ordered and liquid-disordered membranes with the naked eye.

Organic & Biomolecular Chemistry published new progress about 596819-12-4. 596819-12-4 belongs to ethers-buliding-blocks, auxiliary class Thiophene,Boronic acid and ester,Ether,Boronate Esters,Boronic acid and ester, name is 2-(5-Methoxythiophen-2-yl)-4,4,5,5-tetramethyl-1,3,2-dioxaborolane, and the molecular formula is C11H17BO3S, Application In Synthesis of 596819-12-4.

Referemce:
https://en.wikipedia.org/wiki/Ether,
Ether | (C2H5)2O – PubChem

Singh, Anshu published the artcileDesigned pincer ligand supported Co(II)-based catalysts for dehydrogenative activation of alcohols: Studies on N-alkylation of amines, α-alkylation of ketones and synthesis of quinolines, Recommanded Product: N-(4-Methoxybenzyl)pyridin-2-amine, the publication is Dalton Transactions (2021), 50(24), 8567-8587, database is CAplus and MEDLINE.

Base-metal catalysts Co1, Co2 and Co3 were synthesized from designed pincer ligands L¹, L² and L³ having NNN donor atoms, resp. Co1, Co2 and Co3 were characterized by IR, UV-visible and ESI-MS spectroscopic studies. Single crystal x-ray diffraction studies were studied to authenticate the mol. structures of Co1 and Co3. Catalysts Co1, Co2 and Co3 were used to study the dehydrogenative activation of alcs. for N-alkylation of amines, α-alkylation of ketones and synthesis of quinolines. Under optimized reaction conditions, a broad range of substrates including alcs., anilines and ketones were exploited. Control experiments for N-alkylation of amines, α-alkylation of ketones and synthesis of quinolines were examined to understand the reaction pathway. ESI-MS spectral studies were studied to characterize Co-alkoxide and Co-hydride intermediates. Reduction of styrene by evolved H gas during the reaction was studied to authenticate the dehydrogenative nature of the catalysts. Probable reaction pathways are proposed for N-alkylation of amines, α-alkylation of ketones and synthesis of quinolines from control experiments and detection of reaction intermediates.

Dalton Transactions published new progress about 52818-63-0. 52818-63-0 belongs to ethers-buliding-blocks, auxiliary class Pyridine,Amine,Benzene,Ether, name is N-(4-Methoxybenzyl)pyridin-2-amine, and the molecular formula is C10H16BNO2, Recommanded Product: N-(4-Methoxybenzyl)pyridin-2-amine.

Referemce:
https://en.wikipedia.org/wiki/Ether,
Ether | (C2H5)2O – PubChem

Bartz, Jan published the artcileOrganic sulfur compounds in the iodine-azide reaction. III. Linear and cyclic derivatives of thiourea, Category: ethers-buliding-blocks, the publication is Zeszyty Naukowe Uniwersytetu im. Adama Mickiewicza w Poznaniu, Matematyka, Fizyka, Chemia (1967), 161-7, database is CAplus.

Thiourea and many of the 34 derivatives examined had high induction coefficients due to the mesomeric character of thiourea. The differences in induction coefficients of thiourea and its mono- and di-substituted derivatives were negligible. Introduction of 3 Me groups lowered slightly the induction, and 4 Me groups reduced it by one half. NH2 or NH groups separated from each other by at least 1 C atom promoted the induction, whereas the presence of NHNH2 groups had an inhibiting effect.

Zeszyty Naukowe Uniwersytetu im. Adama Mickiewicza w Poznaniu, Matematyka, Fizyka, Chemia published new progress about 14807-75-1. 14807-75-1 belongs to ethers-buliding-blocks, auxiliary class Salt,Thiourea,Amine,Aliphatic hydrocarbon chain, name is Formamidine disulfide dihydrochloride, and the molecular formula is C2H8Cl2N4S2, Category: ethers-buliding-blocks.

Referemce:
https://en.wikipedia.org/wiki/Ether,
Ether | (C2H5)2O – PubChem

Peyronel, Giorgio published the artcileInfrared investigations on the dithioformamidinium dihalides, Name: Formamidine disulfide dihydrochloride, the publication is Spectrochimica Acta, Part A: Molecular and Biomolecular Spectroscopy (1983), 39A(7), 617-20, database is CAplus.

[((H₂N)₂CS)₂]X₂.H₂O (X = Cl, Br, I) and the anhydrous dibromide were investigated by IR spectroscopy. The νNH and δNH₂ bands were identified from the deuterated dithioformamidinium diiodide. With respect to thiourea the νNH and δNH₂ frequencies decreased and increased resp., as in other S-bonded derivatives of thiourea, and the ν_asCN₂ and νCS frequencies increased and decreased resp., in agreement with the increased CN double bond character and the formation of a C-S single bond.

Spectrochimica Acta, Part A: Molecular and Biomolecular Spectroscopy published new progress about 14807-75-1. 14807-75-1 belongs to ethers-buliding-blocks, auxiliary class Salt,Thiourea,Amine,Aliphatic hydrocarbon chain, name is Formamidine disulfide dihydrochloride, and the molecular formula is C2H8Cl2N4S2, Name: Formamidine disulfide dihydrochloride.

Referemce:
https://en.wikipedia.org/wiki/Ether,
Ether | (C2H5)2O – PubChem

Gattow, G. published the artcileOxidation products of thiourea, Recommanded Product: Formamidine disulfide dihydrochloride, the publication is Zeitschrift fuer Anorganische und Allgemeine Chemie (1988), 66-72, database is CAplus.

(H₂N)₂CSSC(NH₂)₂Cl₂ (I) was obtained by H₂O₂ oxidation of thiourea in presence of HCl. Treatment of I with NaH gave H₂N(HN:)CSSC(:NH)NH₂ (II). Neither I nor II, nor (H₂N)₂CSO₂ reacted with CS₂ or chlorodithioformates.

Zeitschrift fuer Anorganische und Allgemeine Chemie published new progress about 14807-75-1. 14807-75-1 belongs to ethers-buliding-blocks, auxiliary class Salt,Thiourea,Amine,Aliphatic hydrocarbon chain, name is Formamidine disulfide dihydrochloride, and the molecular formula is C2H8Cl2N4S2, Recommanded Product: Formamidine disulfide dihydrochloride.

Referemce:
https://en.wikipedia.org/wiki/Ether,
Ether | (C2H5)2O – PubChem

Karelin, A. A. published the artcileInhibition of serum transamidinase by formamidine disulfide. Identification of the SH-group at the active site of the enzyme, Formula: C2H8Cl2N4S2, the publication is Biokhimiya (Moscow) (1972), 37(3), 652-5, database is CAplus and MEDLINE.

Formamidine disulfide (I) [14807-75-1] inhibited the activity of serum transamidinase (EC 2.1.4.1) [9027-35-4] from patients with pancreonecrosis by 50% at 10-6M and by 90% at 2.2 .tim. 10-6M. Preincubation of serum transamidinase with 1 μg trypsin [9002-07-7] increased the inhibitory effect of I. L-canavanine [543-38-4], an amidine donor which is the substrate of the reaction, efficiently protected the activity of the enzyme. Apparently, intactness of the substrate amidine binding region of the enzyme containing the essential sulfhydryl group is the main condition of the preservation of enzymic activity in the blood.

Biokhimiya (Moscow) published new progress about 14807-75-1. 14807-75-1 belongs to ethers-buliding-blocks, auxiliary class Salt,Thiourea,Amine,Aliphatic hydrocarbon chain, name is Formamidine disulfide dihydrochloride, and the molecular formula is C2H8Cl2N4S2, Formula: C2H8Cl2N4S2.

Referemce:
https://en.wikipedia.org/wiki/Ether,
Ether | (C2H5)2O – PubChem