Tag: 200-300

Category: pyridine-derivativesOn October 20, 2003 ,《Coordination Properties of New Bis(1,4,7-triazacyclononane) Ligands: A Highly Active Dizinc Complex in Phosphate Diester Hydrolysis》 was published in Inorganic Chemistry. The article was written by Arca, Massimiliano; Bencini, Andrea; Berni, Emanuela; Caltagirone, Claudia; Devillanova, Francesco A.; Isaia, Francesco; Garau, Alessandra; Giorgi, Claudia; Lippolis, Vito; Perra, Alessandro; Tei, Lorenzo; Valtancoli, Barbara. The article contains the following contents:

The synthesis and characterization of three new bis([9]aneN3) ligands, containing resp. 2,2′-bipyridine (L1), 1,10-phenanthroline (L2), and quinoxaline (L3) moieties linking the two macrocyclic units, are reported. Proton binding and Cu(II), Zn(II), Cd(II), and Pb(II) coordination with L1-L3 were studied by potentiometric titrations and, for L1 and L2, by spectrophotometric UV-visible measurements in aqueous solutions All ligands can give stable mono- and dinuclear complexes. In the case of L1, trinuclear Cu(II) complexes are also formed. The stability constants and structural features of the formed complexes are strongly affected by the different architecture and binding properties of the spacers bridging the two [9]aneN3 units. In the case of the L1 and L2 mononuclear complexes, the metal is coordinated by the three donors of one [9]aneN3 moiety; in the [ML2]2+ complexes, however, the phenanthroline nitrogens are also involved in metal binding. Finally, in the [ML3]2+ complexes both macrocyclic units, at a short distance from each other, can be involved in metal coordination, giving rise to sandwich complexes. In the binuclear complexes each metal ion is generally coordinated by one [9]aneN3 unit. In L1, however, the dipyridine nitrogens can also act as a potential binding site for metals. The dinuclear complexes show a marked tendency to form mono-, di-, and, in some cases, trihydroxo species in aqueous solutions The resulting M-OH functions may behave as nucleophiles in hydrolytic reactions. The hydrolysis rate of bis(p-nitrophenyl)phosphate (BNPP) was measured in aqueous solution at 308.1 K in the presence of the L2 and L3 dinuclear Zn(II) complexes. Both the L2 complexes [Zn2L2(OH)2]2+ and [Zn2L2(OH)3]+ and the L3 complex [Zn2L3(OH)3]+ promote BNPP hydrolysis. The [Zn2L3(OH)3]+ complex is ∼2 orders of magnitude more active than the L2 complexes, due both to the short distance between the metal centers in [Zn2L3(OH)3]+, which could allow a bridging interaction of the phosphate ester, and to the simultaneous presence of single-metal bound nucleophilic Zn-OH functions. These structural features are substantially corroborated by semiempirical PM3 calculations carried out on the mono-, di-, and trihydroxo species of the L3 dizinc complex. In addition to this study using 4,4′-Bis(chloromethyl)-2,2′-bipyridine, there are many other studies that have used 4,4′-Bis(chloromethyl)-2,2′-bipyridine(cas: 138219-98-4Category: pyridine-derivatives) was used in this study.

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. Category: pyridine-derivatives

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

《Endowing 2,6-bis-triazolyl-pyridine of poor extraction with superior efficiency for actinide/lanthanide separation at high acidity by anchoring to a macrocyclic scaffold》 was written by Cai, Yimin; Yan, Qiang; Wang, Mengxin; Chen, Jing; Fu, Haiying; Ye, Jiawei; Conradson, Steven D.; Yuan, Lihua; Xu, Chao; Feng, Wen. Formula: C5H3Br2NThis research focused ontriazolylpyridine macrocyclic scaffold extractant solvent extraction actinide lanthanide separation; Actinide; Lanthanide; N-donor ligand; Separation; Solvent extraction. The article conveys some information:

Exploring nitrogen-containing extractants for recovering hazardous minor actinides that are workable in solutions of high acidity has been a challenge in nuclear waste treatment. Herein, we report our findings that 2,6-bis-triazolyl-pyridine (PyTri), which is ineffective as a hydrophobic ligand for minor actinide separation, turns into an excellent extractant that exhibits unexpectedly high efficiency and selectivity (SFAm/Eu = 172, 1 M HNO3) when attaching to pillar[5]arene platform. Surprisingly, the distribution ratio of Am(III) (DAm) is 4300 times higher than that of the acyclic PyTri ligand. The solvent extraction performance of this pillar[5]arene-achored PyTri not only far exceeds the best known pillar[5]arene ligands reported to date, but also stays comparable to other reported outstanding extractants. Slope anal. indicates that each P[5]A-PyTri can bind two metal ions, which is further corroborated by spectroscopic characterizations. Thermodn. studies imply that the extraction process is exothermic and spontaneous in nature. Complexation investigation via EXAFS technique and DFT calculations strongly suggest that each Eu(III) ion is coordinated to three PyTri arms through a nine-coordination mode. This work provides a N-donor extractant that can operate at high acidity for minor actinide partitioning and implicates a promising approach for transforming poor extractants into superior ones.2,6-Dibromopyridine(cas: 626-05-1Formula: C5H3Br2N) was used in this study.

2,6-Dibromopyridine(cas: 626-05-1) belongs to pyridine. Pyridine-based materials are valued for their optical and physical properties as well as their medical potential. Additionally, pyridine-based natural products continue to be discovered and studied for their properties and to understand their biosynthesis.Formula: C5H3Br2N

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

Recommanded Product: 626-05-1In 2022 ,《Synthesis and Structural Properties of NIR-Absorbing Pyridine-Containing Heptaphyrins》 was published in Chemistry – An Asian Journal. The article was written by Rawat, Nisha; Sinha, Avisikta; Ravikanth, Mangalampalli. The article contains the following contents:

Four examples of stable nonaromatic pyridine containing heteroheptaphyrins (pyrithiaheptaphyrins) 2-5 were synthesized in 8-13% yields by [5+2] condensation of newly synthesized pyridine-based pentapyrrane 8 and bithiophene diol 9 a-d. The X-ray crystallog. anal. of macrocycle 2 proved that the macrocycle assumes a highly planar structure with two inverted thiophene rings. The heteroheptaphyrins 2-5 are asym. and showed a greater number of resonances in 1H NMR spectra compared to our previously reported sym. heterohexaphyrin (pyrithiahexaphyrin) 1 c. Most of the macrocyclic core protons in pyrithiahepaphyrins 2-5 experienced upfield/downfield shifts compared to pyrithiahexaphyrin 1 c indicating the alteration of π-conjugation in the macrocycles. The absorption bands were significantly red-shifted and located in the NIR region in macrocycles 2-5 compared to 1 c supporting the increase of π-delocalization. The theor. studies support the exptl. findings and NICS(0) value supports the non-aromaticity of the macrocycles. In the experimental materials used by the author, we found 2,6-Dibromopyridine(cas: 626-05-1Recommanded Product: 626-05-1)

2,6-Dibromopyridine(cas: 626-05-1) 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. Recommanded Product: 626-05-1

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

Formula: C5H3Br2NIn 2021 ,《Synthesis and Studies of Stable Nonaromatic Dithia Pyribenzihexaphyrins》 was published in Journal of Organic Chemistry. The article was written by Rawat, Nisha; Sinha, Avisikta; Prasannan, Dijo; Ravikanth, Mangalampalli. The article contains the following contents:

We report here one of the rare examples of expanded hexaphyrins named as dithia pyribenzihexaphyrin macrocycles containing six-membered rings such as pyridine and p-phenylene along with five-membered heterocycles such as pyrrole and thiophene as a part of a macrocyclic frame. Trifluoroacetic acid catalyzed [3+3] condensation of equimolar mixture of [10,10′-bis(p-tert-Bu phenyl)hydroxymethyl]-1,3-bis(2-thienyl)pyridine diol (2,6-pyri diol) and 1,4-bis(phenyl(1H-pyrrol-2-yl)methyl)benzene (p-benzidipyrrane) in CH2Cl2 followed by oxidation with DDQ afforded stable nonaromatic dithia 2,6-pyri-para-benzihexapyrins and in 6-8% yields. The macrocycles were characterized by high-resolution mass spectroscopy and 1D and 2D NMR spectroscopy. NMR studies revealed the nonaromatic nature of dithia 2,6-pyri-p-benzihexaphyrins and indicated that the para-phenylene ring prefers to be in quininoid form rather than in benzenoid form. The macrocycles displayed sharp absorption bands in the region of ~380-500 nm and a broad band at ~700 nm, reflecting their nonaromatic nature. Upon protonation, these macrocycles showed NIR absorption properties. The redox studies of macrocycles indicated their electron-deficient nature. The DFT/TD-DFT studies are in line with the exptl. observations. The experimental part of the paper was very detailed, including the reaction process of 2,6-Dibromopyridine(cas: 626-05-1Formula: C5H3Br2N)

2,6-Dibromopyridine(cas: 626-05-1) 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. Formula: C5H3Br2N

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

Related Products of 29682-15-3In 1997 ,《Regiospecific carboalkoxylation of 2,5-dibromopyridine》 appeared in Synthetic Communications. The author of the article were Chambers, R.J.; Marfat, A.. The article conveys some information:

Carboalkoxylation of 2,5-dibromopyridine with carbon monoxide and an alc. in the presence of palladium acetate and 1,1′-bis(diphenylphosphino)ferrocene (dppf) occurs regiospecifically to afford esters of 5-bromopyridine-2-carboxylic acid in good yield. In the part of experimental materials, we found many familiar compounds, such as Methyl 5-bromopicolinate(cas: 29682-15-3Related Products of 29682-15-3)

Methyl 5-bromopicolinate(cas: 29682-15-3) belongs to pyridine. The basicity and metallophilic high donor number of these π-deficient systems has long favored them as ligands in metal catalysis. The last decade saw pyridine assume a stronger role as functional group for directed C–H oxidation/activation.Related Products of 29682-15-3

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

In 2022,Jayabharathi, J.; Thilagavathy, S.; Thanikachalam, V.; Anudeebhana, J. published an article in Materials Today Chemistry. The title of the article was 《Multifunctional zig-zag-shaped D-π-A-π-D emitters with high conjugation extent for blue FOLEDs and host for PHOLEDs》.SDS of cas: 624-28-2 The author mentioned the following in the article:

We have synthesized zig-zag shaped, meta- and para-linked D-π-A-π-D blue emitters, m-BTPAPy and p-BTPAPy based on a non-sym. connection strategy of two identical π-conjugated groups. The phenanthrimidazole moiety coupled to pyridine via naphthyl spacer by para- and meta-linking modes. Both m-BTPAPy (Td/Tg, °C: 564/281) and p-BTPAPy (Td/Tg, °C: 502/246) exhibit excellent thermal stability and can form a stable amorphous film. Changing the connection strategy from para to meta mode, m-BTPAPy shows deep blue emission with CIE (0.15, 0.07). The highly twisted m-BTPAPy exhibit higher Photoluminescence quantum yield (PLQY)s/f of 0.98/0.85 than p-BTPAPy (0.95/0.80) owing to the suppression of intermol. stacking. The non-doped blue device (BOLEDs) with multifunctional m-BTPAPy/p-BTPAPy show external quantum efficiency (EQE) of 7.12/5.12% with small roll-off efficiency of 1.68/2.14%, power efficiency (PE) of 5.92/5.42 lm/W, the luminance of 58675/76234 cd/m2, and current efficiency (CE) of 6.12/5.86 cd/A. The non-doped device using m-BTPAPy/p-BTPAPy as both emitting and electron-transporting material exhibit luminance of 40671/49539 cd/m2, CE of 5.01/5.08 cd/A, PE of 4.68/4.76 lm/W, EQE of 6.12/4.81%, roll-off efficiency of 1.63/1.87%, and CIE (0.15, 0.10)/(0.15, 0.11). These bipolar materials with high triplet energy were employed as hosts in green and red PhOLEDs. The green (m-BTPAPy: Ir(ppy)3)/red device (m-BTPAPy: Ir(MDQ)2(acac)) exhibit maximum EQE of 29.85/20.09%, luminance of 79523/42412 cd/m2, CE of 78.62/27.56 cd/A, and PE of 72.36/23.86 lm/W, and CIE (0.33, 0.60)/(0.65,0.33). The experimental process involved the reaction of 2,5-Dibromopyridine(cas: 624-28-2SDS of cas: 624-28-2)

2,5-Dibromopyridine(cas: 624-28-2) belongs to pyridine. Pyridine derivatives lend themselves to many roles in the spirited field of supramolecular chemistry – whether as the ligand backbone of metal-organic polymers or presiding over the key electronic stations of nanodevices. In biochemistry, pyridine-containing cofactors are necessary nutrients on which our lives depend. SDS of cas: 624-28-2

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

Ge, Yanning; Zhang, Dehua; Zhang, Xiaoyan; Liu, Yang; Du, Longfei; Wang, Yingying published their research in Journal of Chemical Research in 2021. The article was titled 《A new perimidine-based fluorescent turn-on chemosensor for selective detection of Cu2+ ions》.Safety of 2-(Bromomethyl)pyridine hydrobromide The article contains the following contents:

Two new mols. based on 2-(2-alkoxy-1-naphthyl)-2,3-dihydro-1h-perimidine are synthesized. The binding properties are investigated by fluorescence spectroscopy showing that one of the products (2a) can selectively bind Cu2+ with fluorescence enhancement. In the experiment, the researchers used 2-(Bromomethyl)pyridine hydrobromide(cas: 31106-82-8Safety of 2-(Bromomethyl)pyridine hydrobromide)

2-(Bromomethyl)pyridine hydrobromide(cas: 31106-82-8) 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. Safety of 2-(Bromomethyl)pyridine hydrobromide

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

In 2019,Chemistry of Materials included an article by Meier, Christian B.; Clowes, Rob; Berardo, Enrico; Jelfs, Kim E.; Zwijnenburg, Martijn A.; Sprick, Reiner Sebastian; Cooper, Andrew I.. Recommanded Product: 2,5-Dibromopyridine. The article was titled 《Structurally diverse covalent triazine-based framework materials for photocatalytic hydrogen evolution from water》. The information in the text is summarized as follows:

A structurally diverse family of 39 covalent triazine-based framework materials (CTFs) are synthesized by Suzuki-Miyaura polycondensation and tested as hydrogen evolution photocatalysts using a high-throughput workflow. The two best-performing CTFs are based on benzonitrile and dibenzo[b,d]thiophene sulfone linkers, resp., with catalytic activities that are among the highest for this material class. The activities of the different CTFs are rationalized in terms of four variables: the predicted electron affinity, the predicted ionization potential, the optical gap, and the dispersibility of the CTFs particles in solution, as measured by optical transmittance. The electron affinity and dispersibility in solution are found to be the best predictors of photocatalytic hydrogen evolution activity. The results came from multiple reactions, including the reaction of 2,5-Dibromopyridine(cas: 624-28-2Recommanded Product: 2,5-Dibromopyridine)

2,5-Dibromopyridine(cas: 624-28-2) belongs to pyridine. Pyridine is very deactivated towards electrophilic substitution with respect to benzene. For this reason classical formylation, using methods such as the Gattermann or Vilsmeier reactions, are not generally successful. Recommanded Product: 2,5-Dibromopyridine

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

Putans, Becca A.; Bishop, Lee M.; Hamers, Robert J. published an article in Chemistry of Materials. The title of the article was 《Versatile Approach to Formation of Light-Harvesting Complexes on Nanostructured Metal Oxide Surfaces via “”On-Surface”” Assembly》.Electric Literature of C12H10Cl2N2 The author mentioned the following in the article:

A versatile, two-step “”on-surface”” assembly method is demonstrated to build heteroleptic light-harvesting complexes on nanostructured metal oxide surfaces. In this process, building-block ligands were first attached to SnO2 surfaces by grafting 2,2′-bipyridine mols. that were modified at the (4,4′) positions with surface-reactive binding groups. The surface-bound bipyridine ligands then served as a basis for “”on-surface”” assembly of complete surface-bound Ru(bpy)3 complexes by immersing the bipyridyl-modified samples in a solution containing the complex [Ru(bpy)2(CH3CN)2](PF6)2 and illuminating with UV light, which removes the photolabile acetonitrile ligands and allows the solution-phase complex to react with the surface-bound bipyridine mols. to form complete surface-bound Ru(bpy)3 complexes. We demonstrate that this process is effective using three different surface attachment schemes based on aryl-iodo, benzyl-iodo, and dithione bipyridine derivatives The stability of the complexes in water and the charge transfer characteristics were then measured for the different ligand attachment methods. The benzyl-iodo complex provides the best surface coverage and greatest stability. We also demonstrated that the building-block ligand can act as a site for regeneration of the complexes on the surface. The experimental process involved the reaction of 4,4′-Bis(chloromethyl)-2,2′-bipyridine(cas: 138219-98-4Electric Literature of C12H10Cl2N2)

4,4′-Bis(chloromethyl)-2,2′-bipyridine(cas: 138219-98-4) belongs to pyridine derivatives. The ring atoms in the pyridine molecule are sp2-hybridized. The nitrogen is involved in the π-bonding aromatic system using its unhybridized p orbital. Electric Literature of C12H10Cl2N2The lone pair is in an sp2 orbital, projecting outward from the ring in the same plane as the σ bonds.

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

Dumur, Frederic; Guerlin, Audrey; Lehoux, Anais; Selvakannan, P. R.; Miomandre, Fabien; Meallet-Renault, Rachel; Rebarz, Mateusz; Sliwa, Michel; Dumas, Eddy; Le Pleux, Loic; Pellegrin, Yann; Odobel, Fabrice; Mayer, Cedric R. published an article in Applied Surface Science. The title of the article was 《Mutual influence of gold and silver nanoparticles on Tris-(2,2’bipyridine)-Ru(II) core complexes: Post-functionalization processes, optical and electrochemical investigations》.Related Products of 138219-98-4 The author mentioned the following in the article:

The synthesis, reactivity and properties of a series of four polypyridyl ruthenium complexes have been studied. These complexes were used to post-functionalize preformed 3 nm silver and gold nanoparticles (NPs) in water and in dichloromethane (DCM). We studied the influence of the grafted complexes on the formation process and stability of the colloidal solutions and we investigated the optical and electrochem. properties of the final nanocomposites. Among the series of four ruthenium complexes, three novel heteroleptic complexes (1-3) bearing one pyridine, one amine or two carboxydithioic acid pendant groups were synthesized and reacted with preformed Au-NPs and Ag-NPs. Results were compared to those obtained with the model [Ru(bpy)3]2+ complex (4). The strength of the interaction between the anchoring group and the surface of NPs influenced the size, shape and stability of the final nanocomposites. Polar solvent such as water induced aggregation and lead to unstable nanocomposites. Stationary and time resolved luminescence of grafted nanocomposites (1-3) showed that the luminescence of complexes were completely quenched (lifetime and emission quantum yield) in water by electron transfer processes, moreover elec. measurements rationalize that Ag nanocomposites exhibit the stronger quenching due to a lower oxidation potential. It also showed a current enhancement associated with double layer charging of the metal nanoparticle cores. The results came from multiple reactions, including the reaction of 4,4′-Bis(chloromethyl)-2,2′-bipyridine(cas: 138219-98-4Related Products of 138219-98-4)

4,4′-Bis(chloromethyl)-2,2′-bipyridine(cas: 138219-98-4) belongs to pyridine derivatives. The ring atoms in the pyridine molecule are sp2-hybridized. The nitrogen is involved in the π-bonding aromatic system using its unhybridized p orbital. Related Products of 138219-98-4The lone pair is in an sp2 orbital, projecting outward from the ring in the same plane as the σ bonds.

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem