Tag: M.W=200-250

Rudnitskaya, Olga V. published the artcileA balance of redox and ligand-exchange processes in the reaction of H₂[OsCl₆] with thiourea: Isolation and characterization of a novel osmium complex [(NH₂)₂CSSC(NH₂)₂]₂[Os^IVCl₆]Cl₂·3H₂O, Recommanded Product: Formamidine disulfide dihydrochloride, the publication is Inorganica Chimica Acta (2019), 352-356, database is CAplus.

A novel complex with the stoichiometry [(NH₂)₂CSSC(NH₂)₂]₂[Os^IVCl₆]Cl₂·3H₂O (1) was isolated as a product of the reaction of H₂[OsCl₆] with thiourea in concentrated HCl under deliberately optimized conditions favoring a partial thiourea oxidation to α,α’-dithiobisformamidinium dication but preserving hexachloroosmate [OsCl₆]²_– anions. A bromide analog [(NH₂)₂CSSC(NH₂)₂]₂[Os^IVBr₆]Br₂·3H₂O (2) is afforded by a similar reaction. A counter synthesis of 1 is accomplished via the direct ion-exchange reaction between H₂[OsCl₆] and [S₂C₂(NH₂)₄]Cl₂. Crystal structures of 1 and 2 are unambiguously established by synchrotron radiation-based single-crystal x-ray diffraction at 100 K. The two compounds are isostructural and are crystallized in the orthorhombic space group Cmcm, Z = 4. Unit cell parameters are for 1:a = 11.279(2) Å, b 13.611(3), c 16.731(3) Å; for 2: a 11.695(2), b 14.005(3), c 17.015(3) Å. The osmium atoms in [OsX₆]^2- (X = Cl or Br) anions adopt slightly distorted octahedral coordination. The α,α’-dithiobisformamidinium cations are paired into rings via the NH…Cl^– hydrogen bonds. The rings are further linked into a spatial network by H-bonds with water mols. and S…Cl nonvalence interactions.

Inorganica Chimica Acta 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

Minar, Norma K. published the artcileGuided in Situ Polymerization of MEH-PPV in Mesoporous Titania Photoanodes, Related Products of ethers-buliding-blocks, the publication is ACS Applied Materials & Interfaces (2015), 7(19), 10356-10364, database is CAplus and MEDLINE.

Incorporation of conjugated polymers into porous metal oxide networks is a challenging task, which is being pursued via many different approaches. We have developed the guided in situ polymerization of poly(2-methoxy-5-(2′-ethylhexyloxy)-p-phenylenevinylene) (MEH-PPV) in porous titania films by means of surface functionalization. The controlled polymerization via the Gilch route was induced by an alkoxide base and by increasing the temperature The selected and specially designed surface-functionalizing linker mols. mimic the monomer or its activated form, resp. In this way, we drastically enhanced the amount of MEH-PPV incorporated into the porous titania phase compared to nonfunctionalized samples by a factor of 6. Addnl., photovoltaic measurements were performed. The devices show shunting or series resistance limitations, depending on the surface functionalization prior to in situ polymerization of MEH-PPV. We suggest that the reason for this behavior can be found in the orientation of the grown polymer chains with respect to the titania surface. Therefore, the geometry of the anchoring via the linker mols. is relevant for exploiting the full electronic potential of the conjugated polymer in the resulting hybrid composite. This observation will help to design future synthesis methods for new hybrid materials from conjugated polymers and n-type semiconductors to take full advantage of favorable electronic interactions between the two phases.

ACS Applied Materials & Interfaces published new progress about 146370-51-6. 146370-51-6 belongs to ethers-buliding-blocks, auxiliary class Benzene,Ether, name is 1-((2-Ethylhexyl)oxy)-4-methoxybenzene, and the molecular formula is C15H24O2, Related Products of ethers-buliding-blocks.

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

Dellsperger, Simon published the artcileSynthesis and optical properties of novel poly(p-phenyleneethynylene)s, Application In Synthesis of 146370-51-6, the publication is Macromolecular Chemistry and Physics (2000), 201(2), 192-198, database is CAplus.

In order to explore the influence of chem. modifications on the photophys. properties of poly(p-phenyleneethynylene)s (PPEs), a series of PPE-copolymers was synthesized, employing Heck-type cross-coupling reactions. UV/Vis absorption and photoluminescence experiments clearly demonstrate that the design of PPE-copolymers which comprise conjugated segments of well-defined length and (aliphatic) spacers in a strictly alternating fashion allows to tune the bandgap to higher energies, and thus the absorption and emission maxima to shorter wavelengths. The derivatization of the PPE backbone with electron-withdrawing substituents, by contrast, is found to be significantly less effective and only leads to comparably small shifts in the absorption and emission spectra.

Macromolecular Chemistry and Physics published new progress about 146370-51-6. 146370-51-6 belongs to ethers-buliding-blocks, auxiliary class Benzene,Ether, name is 1-((2-Ethylhexyl)oxy)-4-methoxybenzene, and the molecular formula is C15H24O2, Application In Synthesis of 146370-51-6.

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

Doval, David Alonso published the artcilePlanarizable push-pull oligothiophenes: in search of the perfect twist, Application In Synthesis of 596819-12-4, the publication is Chemical Science (2014), 5(7), 2819-2825, database is CAplus.

The concept to couple fluorophore planarization and fluorophore polarization for the construction of innovative fluorescent membrane probes is elaborated comprehensively in the context of oligothiophenes. Increasing length with different degree of twist from ter- to quinquethiophenes results in increasing extinction coefficients, decreasing quantum yields and relatively minor red shifts. Quaterthiophenes show maximal Stokes shifts and are thus preserved to further elaborate on deplanarization. Increasing quaterthiophene deplanarization results in increasing blue shifts and decreasing quantum yields in solution, whereas planarization in solid-ordered lipid bilayer membranes gives the resp. red shifts with fluorescence recovery. An extensive screening reveals that intermediate global deplanarization with strong individual twists near the membrane interface are best. Weaker and stronger global twisting and strong individual twists deeper in the membrane are less convincing because planarization becomes either too easy or too difficult. The best probe reports decreasing membrane fluidity with a red shift of 44 nm and a fluorescence increase of almost 500%. These insights are important because they cover significant chem. space to help improving our understanding of chromophore twisting and promise bright perspectives with regard to biol. applications and refined probe design.

Chemical Science 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

Vladimirtsev, I. F. published the artcilePreparation and biological activity of some thiourea derivatives, Computed Properties of 14807-75-1, the publication is Fiziologicheski Aktivnye Veshchestva (1966-1992) (1975), 120-3, database is CAplus.

H2NC(:NH)SO2H (I) reacted with aqueous HCl at 60-70° to give 37.8% S2[C(:NH)NH2.HCl]2 (II), which reacted with NaOEt to give 100% S, 95% thiourea (III), and 77% S[C(:NH)NH2.HCl]2 (IV). Urea, I, IV, and H2NC(:NH)S(O)SC(:NH)NH2.2H2O inhibited the growth of lettuce, oat, and cucumber sprouts at 0.01%, but stimulated growth at 0.0001%; the opposite effect was observed with III.

Fiziologicheski Aktivnye Veshchestva (1966-1992) 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 C4H10Br2CoO2, Computed Properties of 14807-75-1.

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

Legare, Marc-Andre published the artcileMetal-free catalytic C-H bond activation and borylation of heteroarenes, Computed Properties of 596819-12-4, the publication is Science (Washington, DC, United States) (2015), 349(6247), 513-516, database is CAplus and MEDLINE.

Transition metal complexes are efficient catalysts for the C-H bond functionalization of heteroarenes to generate useful products for the pharmaceutical and agricultural industries. However, the costly need to remove potentially toxic trace metals from the end products has prompted great interest in developing metal-free catalysts that can mimic metallic systems. Authors demonstrated that the borane (1-TMP-2-BH₂-C₆H₄)₂ (TMP, 2,2,6,6-tetramethylpiperidine) can activate the C-H bonds of heteroarenes and catalyze the borylation of furans, pyrroles, and electron-rich thiophenes. The selectivities complement those observed with most transition metal catalysts reported for this transformation.

Science (Washington, DC, United States) 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, Computed Properties of 596819-12-4.

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

Kitson, Trevor M. published the artcileStudies on possible mechanisms for the interaction between cyanamide and aldehyde dehydrogenase, HPLC of Formula: 14807-75-1, the publication is Biochemical Pharmacology (1979), 28(17), 2551-6, database is CAplus and MEDLINE.

Cyanamide (I) [420-04-2] reacted with amino and thiol groups to form guanidino and isothiouronium compounds resp. under physiol. conditions. Sheep liver cytoplasmic aldehyde dehydrogenase (II) [9028-86-8] activity in vitro was not affected by I (1-50 mM), dicyandiamide [461-58-5] (1 mM), or the aminoethylisothiouronium bromide-HBr (III) [56-10-0] (1 mM). Formamidine disulfide-2HCl [14807-75-1] (10-20 μM) inhibited II activity in vitro, but thiourea [62-56-6] (50 mg/kg, i.p. daily for 5 days) and III, (200 mg/kg, i.p., daily for 5 days) did not affect II activity in rat liver in vivo in either cytoplasm or mitochondria. The possible modes of action of I on alc. metabolism are discussed.

Biochemical Pharmacology 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, HPLC of Formula: 14807-75-1.

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

Buhrmester, Claudia published the artcileStudies of Aromatic Redox Shuttle Additives for LiFePO₄-Based Li-Ion Cells, Category: ethers-buliding-blocks, the publication is Journal of the Electrochemical Society (2005), 152(12), A2390-A2399, database is CAplus.

Fifty eight aromatic organic mols. were screened as chem. shuttles to provide overcharge protection for LiFePO₄/graphite and LiFePO₄/Li_4/3Ti_5/3O₄ Li-ion cells. The majority of the mols. were based on methoxybenzene and on dimethoxybenzene with a variety of ligands added to explore their effect. The added ligands affect the redox potential of the mols. through their electron-withdrawing effect and affect the stability of the radical cation. Of all the mols. tested, only 2,5-di-tert-butyl-1,4-dimethoxybenzene shows an appropriate redox potential of 3.9 V vs. Li/Li⁺ and long-term stability during extended abusive overcharge totaling over 300 cycles of 100% overcharge per cycle. The reasons for the success of this mol. are explored.

Journal of the Electrochemical Society published new progress about 146370-51-6. 146370-51-6 belongs to ethers-buliding-blocks, auxiliary class Benzene,Ether, name is 1-((2-Ethylhexyl)oxy)-4-methoxybenzene, and the molecular formula is C15H24O2, Category: ethers-buliding-blocks.

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

Peng, Kang-Yung published the artcileEfficient Light Harvesting by Sequential Energy Transfer across Aggregates in Polymers of Finite Conjugational Segments with Short Aliphatic Linkages, SDS of cas: 146370-51-6, the publication is Journal of the American Chemical Society (2001), 123(46), 11388-11397, database is CAplus and MEDLINE.

A series of light-harvesting polymers (poly-DSBs) of dialkyloxy- or dialkyl-substituted distyrylbenzene ( substituents = methoxy, 2-ethylhexyloxy, and cyclohexyl) with methylene or ethylene spacers were prepared The interactions between lumophores and the role of chem. structure of poly-DSBs on the absorption, emission, and excitation spectra were studied. The proximity of distyrylbenzene lumophores was critical to effective interactions and to the energy-transfer processes. In concentrated solutions and solid films, intermol. aggregates exist resulting from different extents of interactions between lumophores and involve at least three species: loose, compact, and aligned aggregates as observed by photoluminescence and excitation spectroscopy. Sequential energy transfer was directly observed from individual lumophores to the most compact, aligned aggregates via looser intermol. aggregates by time-resolved fluorescence spectroscopy. This process mimics energy transfer in photosynthesis and is highly efficient; fluorescence can be red-shifted drastically by the presence of comparatively few aggregates and light from concentrated solutions and films of poly-DSBs is entirely or almost due to aggregation emission. Although sequential energy-transfer in fully conjugated electro/photoluminescent polymers due to inhomogeneity other than distributed conjugation length has never been directly observed at room temperature, events similar to those observed in poly-DSBs could occur but on a much shorter time scale, i.e., a few picoseconds.

Journal of the American Chemical Society published new progress about 146370-51-6. 146370-51-6 belongs to ethers-buliding-blocks, auxiliary class Benzene,Ether, name is 1-((2-Ethylhexyl)oxy)-4-methoxybenzene, and the molecular formula is C15H24O2, SDS of cas: 146370-51-6.

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

Pan, Jiang-Qing published the artcileSynthesis and characterization of fully soluble polyphenylenevinylene, SDS of cas: 146370-51-6, the publication is Chinese Journal of Polymer Science (2000), 18(6), 541-549, database is CAplus.

Fully soluble poly[2-(2-ethylhexyloxy)-5-methoxy-p-phenylenevinylene] was synthesized by the polymerization of 2-(2-ethylhexyloxy)-5-methoxy-1,4-xylylene dibromide with addition of mol. weight modifiers (chain stopper, free radical scavengers) to a polymerization system containing monomer, catalyst, and solvent. The polymers synthesized in this work were characterized by IR, NMR, and UV-visible spectroscopy, and gel-permeation chromatog. Results show that the weight-average mol. weight of the polymer can be controlled by the addition of chain stopper (benzyl bromide) and radical inhibitor (BHT). The polymerization mechanism in the presence of these additives was also discussed. A dual mechanism involving carbene for the polymerization was proposed.

Chinese Journal of Polymer Science published new progress about 146370-51-6. 146370-51-6 belongs to ethers-buliding-blocks, auxiliary class Benzene,Ether, name is 1-((2-Ethylhexyl)oxy)-4-methoxybenzene, and the molecular formula is C15H24O2, SDS of cas: 146370-51-6.

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