Tag: 200-300

《Acetylene-linked conjugated polymers for sacrificial photocatalytic hydrogen evolution from water》 was written by Liu, Lunjie; Kochman, Michal A.; Xu, Yongjie; Zwijnenburg, Martijn A.; Cooper, Andrew I.; Sprick, Reiner Sebastian. Synthetic Route of C5H3Br2N And the article was included in Journal of Materials Chemistry A: Materials for Energy and Sustainability in 2021. The article conveys some information:

Conjugated organic polymers have shown potential as photocatalysts for hydrogen production by water splitting. Taking advantage of a high throughput screening workflow, two series of acetylene-linked co-polymers were prepared and studied for their potential as photocatalysts for sacrificial hydrogen production from water. It was found that a triethynylbenzene-based polymer with a dibenzo[b,d]thiophene sulfone linker (TE11) had the highest performance in terms of hydrogen evolution rate under visible illumination in the presence of a sacrificial hole-scavenger. Synthetically elaborating the triethynylbenzene linker in TE11 by changing the core and by introducing nitrogen, the resulting hydrogen evolution rate was further increased by a factor of nearly two. The experimental part of the paper was very detailed, including the reaction process of 2,5-Dibromopyridine(cas: 624-28-2Synthetic Route of C5H3Br2N)

2,5-Dibromopyridine(cas: 624-28-2) belongs to pyridine. Pyridine and its simple derivatives are stable and relatively unreactive liquids, with strong penetrating odours that are unpleasant.Synthetic Route of C5H3Br2N

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

《Crystal structure of 2,6-bis(3-hydroxy-3-methylbut-1-yn-1-yl)pyridine monohydrate》 was published in Acta Crystallographica, Section E: Crystallographic Communications in 2020. These research results belong to Koizumi, Take-aki; Takata, Toshikazu. Product Details of 626-05-1 The article mentions the following:

In the title pyridine derivative, C15H17NO2·H2O, the two OH groups are oriented in directions opposite to each other with respect to the plane of the pyridine ring. In the crystal, hydrogen bonds between the pyridine mol. and the water mol., viz. Ohydroxy-H · · · Owater, Ohydroxy-H · · · Ohydroxy, Owater-H · · · Ohydroxy and Owater-H· · · Npyridine, result in the formation of a ribbon-like structure running along [011]. In the part of experimental materials, we found many familiar compounds, such as 2,6-Dibromopyridine(cas: 626-05-1Product Details of 626-05-1)

2,6-Dibromopyridine(cas: 626-05-1) belongs to pyridine. Pyridine’s structure is isoelectronic with that of benzene, but its properties are quite different. Pyridine is completely miscible with water, whereas benzene is only slightly soluble. Like all hydrocarbons, benzene is neutral (in the acid–base sense), but because of its nitrogen atom, pyridine is a weak base.Product Details of 626-05-1

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

《Understanding the role of acid-base interactions using architecturally-controlled, pyridyl-bearing sulfonated phenylated polyphenylenes》 was published in Journal of Materials Chemistry A: Materials for Energy and Sustainability in 2020. These research results belong to Xu, Shaoyi; Wu, Yang; Adamski, Michael; Fraser, Kate; Holdcroft, Steven. Related Products of 624-28-2 The article mentions the following:

Acid-base interactions between N-heterocycles and sulfonic acid groups are known to mitigate the excessive swelling of hydrocarbon-based proton exchange polymers, but concurrently reduce the concentration of hydrated protons therein, which lowers proton conductivity We report sulfonated phenylated poly(phenylene) homopolymers designed with similar architecture but with an increasing number of strategically-placed N-atoms in the form of pyridyl units. It is discovered that polymers with 2 or more pyridines per repeat unit do not stoichiometrically neutralize pendent sulfonic acids. For example, four pyridines per repeat unit neutralize the equivalent of ~2 sulfonic acids, resulting in a reduced number of pyridinium (H+)-sulfonate cross links than anticipated. DFT calculations reveal that externally-exposed pyridine groups form a stronger interaction with protons than a sterically-hindered pyridine that affects mech. properties and water sorption. Nonetheless, as the number of N-atoms is increased, the fraction of neutralized -SO3H protons is increased, and the material’s ion exchange capacity, proton conductivity, liquid and vaporous water sorption, dimensional swelling, steady-state water permeability, and transient diffusivity all decrease. With four pyridyl groups per repeating unit, dimensional swelling of the fully hydrated polymer, steady-state water permeability are similar to the Nafion N211 reference material. However, proton conductivities under reduced RH are substantially reduced due to their low water sorption. This work provides insight into tailoring proton exchange membranes via acid-base, self-neutralization for the purpose of controlling their transport properties.2,5-Dibromopyridine(cas: 624-28-2Related Products of 624-28-2) was used in this study.

2,5-Dibromopyridine(cas: 624-28-2) belongs to pyridine. Pyridine and its simple derivatives are stable and relatively unreactive liquids, with strong penetrating odours that are unpleasant.Related Products of 624-28-2

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

《Bulk atom transfer radical polymerization of styrene using multifunctional ruthenium(II) tris bipyridine complexes as initiators》 was written by Collins, James E.; Fraser, Cassandra L.. Recommanded Product: 4,4′-Bis(chloromethyl)-2,2′-bipyridine And the article was included in Polymer Preprints (American Chemical Society, Division of Polymer Chemistry) on August 31 ,1998. The article conveys some information:

Di-, tetra-, and hexafunctional chloromethyl-substituted Ru(II) tris bipyridine complexes were used as initiators for bulk atom transfer radical polymerization of styrene. Narrow mol. weight distributions were obtained in all cases for polystyrenes having two, four and six arms. The results came from multiple reactions, including the reaction of 4,4′-Bis(chloromethyl)-2,2′-bipyridine(cas: 138219-98-4Recommanded Product: 4,4′-Bis(chloromethyl)-2,2′-bipyridine)

4,4′-Bis(chloromethyl)-2,2′-bipyridine(cas: 138219-98-4) belongs to pyridine derivatives. Several pyridine derivatives play important roles in biological systems. While its biosynthesis is not fully understood, nicotinic acid (vitamin B3) occurs in some bacteria, fungi, and mammals. Recommanded Product: 4,4′-Bis(chloromethyl)-2,2′-bipyridine

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

《Aniline-substituted 2,2′-bipyridine ligands for polymer modified electrodes》 was written by Horwitz, Colin P.; Qi, Zuo. Application In Synthesis of 4,4′-Bis(chloromethyl)-2,2′-bipyridine And the article was included in Polymer Preprints (American Chemical Society, Division of Polymer Chemistry) on August 31 ,1991. The article conveys some information:

Metal complexes of 4-anilinomethyl-4′-methyl-2,2′-bipyridine and 4,4′-bis(anilinomethyl)-2,2′-bipyridine were prepared and polymerized as thin films on electrodes. The electrochem. response of the polymer-coated electrodes was studied. The experimental process involved the reaction of 4,4′-Bis(chloromethyl)-2,2′-bipyridine(cas: 138219-98-4Application In Synthesis of 4,4′-Bis(chloromethyl)-2,2′-bipyridine)

4,4′-Bis(chloromethyl)-2,2′-bipyridine(cas: 138219-98-4) belongs to pyridine derivatives. Several pyridine derivatives play important roles in biological systems. While its biosynthesis is not fully understood, nicotinic acid (vitamin B3) occurs in some bacteria, fungi, and mammals. Application In Synthesis of 4,4′-Bis(chloromethyl)-2,2′-bipyridine

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

Reference of 2-(Bromomethyl)pyridine hydrobromideIn 2019 ,《Facile synthesis and separation of E/Z isomers of aromatic-substituted tetraphenylethylene for investigating their fluorescent properties via single crystal analysis》 was published in Journal of Materials Chemistry C: Materials for Optical and Electronic Devices. The article was written by Lu, Zhixiang; Yang, Shaoxiong; Liu, Xiaolan; Qin, Yu; Lu, Shuhan; Liu, Yanxiong; Zhao, Ruidun; Zheng, Liyan; Zhang, Hongbin. The article contains the following contents:

The intermol. interactions and mol. packing form of fluorescent mols. have a huge impact on their optical properties, especially for AIE mols. As a class of typical AIE mols., tetraphenylethene (TPE) and its derivatives have prominent optical properties; nevertheless, separation of mixtures of E/Z isomers is a great challenge. Herein, a series of aromatic-substituted TPE derivatives were synthesized and used to sep. mixtures of E/Z isomers by common column chromatog. with high yields, as confirmed by single crystal anal., mass spectrometry and NMR spectroscopy. The structure-property relationships of these mols. were systematically investigated by a combination of spectroscopic methods, theor. calculations and single crystal data anal. E/Z isomers exhibit many different fluorescent properties, such as AIE and mechanochromic behavior. Moreover, the position of N on the substituted pyridine ring also has an effect on the mol. stack pattern and the fluorescent properties. Collectively, our findings could not only improve the fundamental understanding of the cis/trans isomerization and photophys. properties of TPE derivatives but also provide a good strategy for designing different substituted groups that can produce various functions and have more potential applications. The experimental process involved the reaction of 2-(Bromomethyl)pyridine hydrobromide(cas: 31106-82-8Reference of 2-(Bromomethyl)pyridine hydrobromide)

2-(Bromomethyl)pyridine hydrobromide(cas: 31106-82-8) belongs to pyridine. Pyridines, quinolines, and isoquinolines have found a function in almost all aspects of organic chemistry. Pyridine has found use as a solvent, base, ligand, functional group, and molecular scaffold. As structural elements, these moieties are potent electron-deficient groups, metal-directing functionalities, fluorophores, and medicinally important pharmacophores. Reference of 2-(Bromomethyl)pyridine hydrobromide

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

Zhang, Guobing; Yu, Hao; Sun, Yue; Wang, Weiwei; Zhao, Yao; Wang, Lichun; Qiu, Longzhen; Ding, Yunsheng published their research in Journal of Materials Chemistry C: Materials for Optical and Electronic Devices in 2021. The article was titled 《Aza-substitution on naphthalene diimide-based conjugated polymers for n-type bottom gate/top contact polymer transistors under ambient conditions》.Reference of 2,5-Dibromopyridine The article contains the following contents:

Four conjugated polymers based on naphthalene diimide (NDI) as the acceptor and thiophene-phenyl-thiophene with different aza-substitutions as co-units were synthesized. The aza-substitution gradually lowered the HOMO (HOMO) and the LUMO (LUMO) energy levels. The polymer with four aza-substitutions exhibited the deepest LUMO/HOMO energy level (-4.10/-6.01 eV). Consequently, organic field-effect transistors (OFETs) based on the bottom-gate/top-contact configuration exhibited unipolar electron transport characteristics even if the devices were exposed directly to ambient conditions. Furthermore, the corresponding devices also maintained their n-type transport behavior during long-term storage in air (>300 days). This work demonstrated that the incorporation of nitrogen atoms into NDI-based conjugated polymers for further lowering the energy levels is a feasible strategy for the construction of air-stable n-type unencapsulated OFETs. After reading the article, we found that the author used 2,5-Dibromopyridine(cas: 624-28-2Reference of 2,5-Dibromopyridine)

2,5-Dibromopyridine(cas: 624-28-2) belongs to pyridine. In industry and in the lab, pyridine is used as a reaction solvent, particularly when its basicity is useful, and as a starting material for synthesizing some herbicides, fungicides, and antiseptics.Reference of 2,5-Dibromopyridine

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

Zhu, Ze-Lin; Chen, Wen-Cheng; Ni, Shao-Fei; Yan, Jie; Wang, Sheng Fu; Fu, Li-Wen; Tsai, Han-Yan; Chi, Yun; Lee, Chun-Sing published their research in Journal of Materials Chemistry C: Materials for Optical and Electronic Devices in 2021. The article was titled 《Constructing deep-blue bis-tridentate Ir(III) phosphors with fluorene-based dianionic chelates》.Electric Literature of C5H3Br2N The article contains the following contents:

High efficiency and stable blue phosphors have been a persistent pursuit in the field of organic light-emitting diodes (OLEDs). Bis-tridentate Ir(III) complexes are considered as promising alternatives because of their excellent emission efficiency and good photostability. However, the emission colors of photostable bis-tridentate Ir(III) emitters reported so far do not reach the deep blue region. Herein, fluorene is introduced in the design of blue bis-tridentate Ir(III) complexes. By modifying a fluorene-based dianionic chelate with tert-Bu, methoxy, pyrrolidinyl and triazolyl appendages, five blue emitting bis-tridentate Ir(III) phosphors were successfully designed and prepared Emissions of the new phosphors exhibited a gradual blue shift from the sky blue to the deep blue region according to the electron donating abilities of the added substituents. A deep blue OLED was successfully fabricated based on Flu-4 and presented an excellent maximum external quantum efficiency of 22.3% with CIE coordinates of (0.17, 0.19), which are comparable to the state-of-the-art deep blue phosphors. In the experiment, the researchers used 2,6-Dibromopyridine(cas: 626-05-1Electric Literature of C5H3Br2N)

2,6-Dibromopyridine(cas: 626-05-1) belongs to pyridine. Pyridines are often used as catalysts or reagents; particular notice has been paid recently to how pyridine coordinates to metal centers enabling a wide range of valuable reactions. Electric Literature of C5H3Br2N

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

Wei, Jun;Liang, Huamin;Ni, Chuanfa;Sheng, Rong;Hu, Jinbo published 《Transition-Metal-Free Desulfinative Cross-Coupling of Heteroaryl Sulfinates with Grignard Reagents》. The research results were published in《Organic Letters》 in 2019.Product Details of 2098851-48-8 The article conveys some information:

A mild cross-coupling reaction of heteroaryl sulfinates with Grignard reagents has been developed under transition-metal-free conditions. This study provides an example of the SO₂^2- as a leaving group in an aromatic system and an effective methodol. for the construction of C-C bond.Sodium 5-(trifluoromethyl)pyridine-2-sulfinate (cas: 2098851-48-8) were involved in the experimental procedure.

N-Arylation of a wide range of NH substrates by reaction with boronic acid in the presence of cupric acetate and either triethylamine or pyridine at room temperature. The reaction works even for poorly nucleophilic substrates such as arylamide. So Sodium 5-(trifluoromethyl)pyridine-2-sulfinate(cas: C6H3F3NNaO2S) can also undergo this reaction.Product Details of 2098851-48-8

Reference:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

Li, Cheng;Li, Yang;Li, Xinyu;Ma, Xupu;Ru, Shuhua;Qiu, Tianlei;Lu, Anxiang published 《Veterinary antibiotics and estrogen hormones in manures from concentrated animal feedlots and their potential ecological risks》 in 2021. The article was appeared in 《Environmental Research》. They have made some progress in their research.Product Details of 80-32-0 The article mentions the following:

The spread of pharmaceutically active chems. (PACs), such as antibiotics and estrogenic hormones from animal manures can pose threats to the ecol. environment. In this work, animal manure samples were collected from 71 concentrated animal feedlots in Northern China and investigated for 24 antibiotics and 4 estrogenic hormones. Results showed that these micropollutants were ubiquitous in manures with the concentration ranges of undetectable (ND)-543,445μg/kg (mean: 44,568μg/kg) for antibiotics and ND-249.8μg/kg (mean: 24.78μg/kg) for estrogens. There was a significant variation in the amounts of PACs in different animal manures. The amounts of antibiotics in manures had following order: swine (83,177μg/kg) μchicken (52,932μg/kg) > beef (37,120μg/kg) > dairy (305μg/kg), while the estrogens in dairy (mean: 39.27μg/kg) and chicken manures (mean: 40.08μg/kg) were higher than those in beef (2.7μg/kg) and swine manures (1.8μg/kg). Based on the estimated farmland application rate of manure, antibiotics and estrogens may cause high ecol. risks to terrestrial organisms according to the risk quotient evaluation. Estrogens could pose a relatively higher risk than antibiotics. The toxicol. effects of antibiotics and estrogens to the terrestrial environment should receive more intensive study. To complete the study, the researchers used 4-Amino-N-(6-chloropyridazin-3-yl)benzenesulfonamide (cas: 80-32-0) .

4-Amino-N-(6-chloropyridazin-3-yl)benzenesulfonamide(cas: 80-32-0) can be introduced in the drinking water to fabricate aqueous liquid formulations for combating bacterial and protozoal in animals.Product Details of 80-32-0 Besides, sulfachloropyridazine associated to tripelennamine hydrocholoride has been demonstrated to function as an anti-stress agent in poultry after vaccinations.

Reference:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem