Day: October 13, 2022

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

In 2019,Journal of Materials Chemistry C: Materials for Optical and Electronic Devices included an article by Jang, Seokhoon; Lee, Kyung Hyung; Lee, Jun Yeob; Lee, Youngu. COA of Formula: C5H6BNO2. The article was titled 《Novel hole blocking materials based on 2,6-disubstituted dibenzo[b,d]furan and dibenzo[b,d]thiophene segments for high-performance blue phosphorescent organic light-emitting diodes》. The information in the text is summarized as follows:

Novel hole blocking materials (HBMs) based on 2,6-disubstituted dibenzo[b,d]furan and dibenzo[b,d]thiophene segments, 3,3′,3”,3”’-(dibenzo[b,d]furan-2,6-diylbis(benzene-5,3,1-triyl))tetrapyridine (26DBFPTPy) and 3,3′,3”,3”’-(dibenzo[b,d]thiophene-2,6-diylbis(benzene-5,3,1-triyl))tetrapyridine (26DBTPTPy), are successfully designed and synthesized for high-performance blue phosphorescent organic light-emitting diodes (PhOLEDs) for the first time. Computational simulation is used to investigate the optimal structure, orbital distribution, and physicochem. properties of both mols. Thermal, optical, and electrochem. anal. shows that 26DBFPTPy and 26DBTPTPy possess high thermal stability, deep HOMO energy levels (-7.08 and -6.91 eV), and a high triplet energy (ET) (2.75 and 2.70 eV). Blue PhOLEDs with 26DBFPTPy or 26DBTPTPy as a hole blocking layer (HBL) exhibit a low turn-on voltage (3.0 V) and operating voltage (4.5 V) at 1000 cd m-2. In addition, the blue PhOLEDs with 26DBFPTPy or 26DBTPTPy show superior external quantum efficiencies (24.1 and 23.6%) and power efficiencies (43.9 and 42.7 lm W-1). They also show a very small efficiency roll-off of about 8.5% from 100 to 1000 cd m-2. Furthermore, they exhibit improved lifetimes compared to the similarly designed HBL with a pyridine electron transport unit and a Ph core structure. In the experimental materials used by the author, we found Pyridin-3-ylboronic acid(cas: 1692-25-7COA of Formula: C5H6BNO2)

Pyridin-3-ylboronic acid(cas: 1692-25-7) 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. COA of Formula: C5H6BNO2

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

Benazzi, Elisabetta; Begato, Federico; Niorettini, Alessandro; Destro, Lorenza; Wurst, Klaus; Licini, Giulia; Agnoli, Stefano; Zonta, Cristiano; Natali, Mirco published their research in Journal of Materials Chemistry A: Materials for Energy and Sustainability in 2021. The article was titled 《Electrocatalytic hydrogen evolution using hybrid electrodes based on single-walled carbon nanohorns and cobalt(II) polypyridine complexes》.Electric Literature of C12H13N3 The article contains the following contents:

The generation of hydrogen from water represents an important task towards a carbon neutral economy. Within this context, the preparation of hybrid electrodes merging the versatility of solid-state porous substrates and the catalytic ability and tunability of mol. complexes represents a great challenge. In the present work, we report on the preparation of hybrid cathodes for the hydrogen evolution reaction (HER) through an unprecedented combination of single-walled carbon nanohorns (SWCNHs) and two novel cobalt(II) polypyridine complexes based on the tris(2-pyridylmethyl)amine (TPMA) ligand scaffold. Suitable pyrene groups are introduced in the ligand framework in different positions to provide a way for direct anchoring onto the carbonaceous substrate by exploiting non-covalent π-π interactions. The present systems behave as competent cathodes for the HER in neutral aqueous solution with overpotentials of η ~0.5 V and stable current densities (within 1 h electrolysis) up to -0.50 mA cm-2, whose exact values depend on the catalyst used and are mainly related to the resp. loading on the electrode surface. In both cases, hydrogen evolution is detected under continuous electrolysis for up to ca. 12 h leading to maximum turnover numbers (TONs) of 4700 and 9180 molH2 molCo-1 for the two different complexes. The progressive deactivation under electrolytic conditions is mainly ascribed to leaching of the metal center from the polydentate ligand, likely occurring from the competent catalytic intermediates involved in the HER. In the experiment, the researchers used many compounds, for example, Bis(pyridin-2-ylmethyl)amine(cas: 1539-42-0Electric Literature of C12H13N3)

Bis(pyridin-2-ylmethyl)amine(cas: 1539-42-0) is a secondary amine with two picolyl substituents. As a tridentate ligand this compound provides three nitrogen donors that affords good selectivity for Zn2+ over biologically relevant metals such as Na+, K+, Mg2+ and Ca2+, and leaves coordination sites free for anion binding. Electric Literature of C12H13N3

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

《A copper complex based catalytic conversion and isolation of carbonate from CO2 for the carbon sequestration process》 was published in Journal of Industrial and Engineering Chemistry (Amsterdam, Netherlands) in 2020. These research results belong to Sivanesan, Dharmalingam; Seo, Bongkuk; Lim, Choong-Sun; Kim, Hyeon-Gook. Recommanded Product: Bis(pyridin-2-ylmethyl)amine The article mentions the following:

The conversion of CO2 into value-added chems. of industrial significance is of great interest due to global warming-related concerns and the depletion of natural resources. This paper describes a mononuclear copper complex with an N3S coordination environment that can catalyze the conversion of CO2 into the carbonate anion with an ambient O2. Electrochem. studies indicate that the N3S-ligated Cu(II) complex can be reduced to Cu(I), which can subsequently generate the carbonate anion from CO2 and ambient O2. In presence of LiClO4 when the N3S-ligated complex Cu(II) is reduced to Cu(I), the complex easily releases the carbonate anion which easily precipitates as Li2CO3 in CH3CN. These studies suggest that the N3S-ligated Cu(II)/(I) complexes can be used to convert CO2 to carbonate and isolate the generated carbonate. After reading the article, we found that the author used Bis(pyridin-2-ylmethyl)amine(cas: 1539-42-0Recommanded Product: Bis(pyridin-2-ylmethyl)amine)

Bis(pyridin-2-ylmethyl)amine(cas: 1539-42-0) is a secondary amine with two picolyl substituents. As a tridentate ligand this compound provides three nitrogen donors that affords good selectivity for Zn2+ over biologically relevant metals such as Na+, K+, Mg2+ and Ca2+, and leaves coordination sites free for anion binding. Recommanded Product: Bis(pyridin-2-ylmethyl)amine

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

《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

Formula: C8H9NO3On November 30, 1998 ,《Additive effect of substituents and heterocyclic nitrogen on the alkaline hydrolysis rate of methyl esters of the substituted pyridinecarboxylic acids》 appeared in Russian Journal of Organic Chemistry (Translation of Zhurnal Organicheskoi Khimii). The author of the article were Sedova, V. F.; Skurko, O. P.. The article conveys some information:

Rate constants of alk. hydrolysis of Me esters in 6 series of substituted pyridinecarboxylates additively correlate with σ-constants of the N atom in the pyridine ring and of substituents, taking into account the transmission factors of their inductive and resonance effects.Methyl 5-methoxypicolinate(cas: 29681-39-8Formula: C8H9NO3) was used in this study.

Methyl 5-methoxypicolinate(cas: 29681-39-8) belongs to pyridine. Pyridine, its benzo and pyridine-based compounds play diverse roles in organic chemistry. As ligands, solvents, and catalysts they facilitate reactions; thus descriptions of these new ligands and their applications abound each year.Formula: C8H9NO3

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

《Iridium motif linked porphyrins for efficient light-driven hydrogen evolution via triplet state stabilization of porphyrin》 was written by Tritton, Daniel Nnaemaka; Bodedla, Govardhana Babu; Tang, Geliang; Zhao, Jianzhang; Kwan, Chak-Shing; Leung, Ken Cham-Fai; Wong, Wai-Yeung; Zhu, Xunjin. Computed Properties of C12H12N2 And the article was included in Journal of Materials Chemistry A: Materials for Energy and Sustainability in 2020. The article conveys some information:

Two new iridium motif linked porphyrins, MBPyZnP-Ir and TBPyZnP-Ir are developed for photocatalytic hydrogen evolution (PHE). The tetra-iridium linked one, TBPyZnP-Ir, displayed the highest H2 production rate (ηH2) of 16.12 mmol g-1 h-1 within 5 h of irradiation, which is over 2.73-fold higher than MBPyZnP-Ir (5.90 mmol g-1 h-1) and much higher than their precursors TBPyZnP (0.12 mmol g-1 h-1) and MBPyZnP (0.06 mmol g-1 h-1) without iridium. The superior ηH2 of TBPyZnP-Ir could be explained by the iridium motifs linked to the porphyrin, stabilizing the triplet states of the porphyrin through intramol. energy transfer; thus enhancing electron transfer from the triplet photo-excited porphyrin moiety to the cobaloxime co-catalyst and consequently proton reduction The experimental process involved the reaction of 4,4′-Dimethyl-2,2′-bipyridine(cas: 1134-35-6Computed Properties of C12H12N2)

4,4′-Dimethyl-2,2′-bipyridine(cas: 1134-35-6) is used as a chemical Intermediate. It can be used for the determination of ferrous and cyanide compounds.Computed Properties of C12H12N2 Furthermore, 4,4′-Dimethyl-2,2′-bipyridine is used in the synthesis of a series of o-phenanthroline-substituted ruthenium(II) complexes.

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

Shafikov, Marsel Z.; Suleymanova, Alfiya F.; Kutta, Roger J.; Brandl, Fabian; Gorski, Aleksander; Czerwieniec, Rafal published an article in 2021. The article was titled 《Dual emissive dinuclear Pt(II) complexes and application to singlet oxygen generation》, and you may find the article in Journal of Materials Chemistry C: Materials for Optical and Electronic Devices.Recommanded Product: 2-Bromo-5-methylpyridine The information in the text is summarized as follows:

Room-temperature dual emission consisting of spectrally separated fluorescence and phosphorescence is highly attractive as a design principle for ratiometric sensing materials, for example, for detection of dioxygen. Compounds susceptible to emission quenching by dioxygen, producing dioxygen in electronically excited states, are also used as photosensitizers for singlet O generation. Combination of the dual emission behavior and efficient energy transfer from one of the emitting states (triplet state) of the dual emissive compound to mol. dioxygen can result in potent photosensitizers easily traceable by fluorescence spectroscopy, which may be advantageous for instance in biol. studies. Herein, the authors present two Pt(II) complexes 1 and 2 of dinuclear structure which exhibit green fluorescence with sub-nanosecond lifetimes and near IR (NIR) phosphorescence with microsecond lifetimes. Such properties are achieved via the design of a strongly π-excessive ditopic ligand with a NĈ-CN̂ coordinating mode that bridges the metal centers. The ligand centered character of the lowest excited singlet (S1) and triplet (T1) states leads to strong exchange interaction of the unpaired electrons and hence to large energy separation ΔE(S1-T1) amounting to 0.6 eV for 1 and 0.7 eV for 2, resp. The large energy gap ΔE(S1-T1) and weak metal contribution to the states S1 and T1 results in unusually long intersystem crossing (ISC) times τISC(S1 → T1) of 27.5 ps (1) and 65.2 ps (2), resp., as determined by transient absorption spectroscopy. Owing to the slow ISC, the T1 → S0 phosphorescence of both 1 and 2 is accompanied by S1 → S0 fluorescence of comparable intensity. The large gap ΔE(S1-T1) provides also a good optical separation of the two emissions. The phosphorescence signal is efficiently quenched in the presence of dioxygen, which is manifested in both the lower relative intensity and shorter decay time of phosphorescence. Thus, the compounds show high potential as ratiometric dioxygen sensing materials. The singlet O photogeneration efficiencies of complexes 1 and 2, measured in air saturated CH2Cl2, are as high as φΔ ≈ 0.77 ± 0.1 and 0.57 ± 0.1, resp. Thus, the compounds represent efficient singlet O photosensitizers.2-Bromo-5-methylpyridine(cas: 3510-66-5Recommanded Product: 2-Bromo-5-methylpyridine) was used in this study.

2-Bromo-5-methylpyridine(cas: 3510-66-5) 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. Recommanded Product: 2-Bromo-5-methylpyridine

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

The author of 《Vapochromic luminescent proton conductors: switchable vapochromism and proton conduction of luminescent Pt(II) complexes with proton-exchangeable sites》 were Kobayashi, Atsushi; Imada, Shin-ichiro; Shigeta, Yasuhiro; Nagao, Yuki; Yoshida, Masaki; Kato, Masako. And the article was published in Journal of Materials Chemistry C: Materials for Optical and Electronic Devices in 2019. Formula: C20H14N4 The author mentioned the following in the article:

Two luminescent and highly proton-conductive Pt(II) complexes [PtCl(tpypy)]Cl and [PtCl(tpypyH)]Cl2 (1 and 1·HCl, resp.; tpypy = 2,2′: 6′,2”-terpyridine-4′,4”’-pyridine) were successfully synthesized. X-ray anal. revealed that the intermol. Pt···Pt interaction was ineffective in the monohydrated form of 1·H2O but effective in dihydrate and hexahydrate forms, 1·HCl·nH2O (n = 2 and 6). Yellow luminescence (λem = 519 nm and Φ = 0.016) assigned to intraligand 3π-π* phosphorescence was observed for 1·H2O, whereas a stronger red emission ascribable to the phosphorescence from the triplet metal-metal-to-ligand charge transfer (3MMLCT) state was observed for the HCl adduct 1·HCl·nH2O (λem = 741 nm, Φ = 0.06 for n = 2, λem = 642 nm, and Φ = 0.10 for n = 6). Both complexes exhibited strong relative humidity (RH)-dependent proton conductivity, while surprisingly high conductivity was observed for 1·HCl (6.8 × 10-3 S cm-1) at 95% RH at 298 K. The reversible transformation between 1 and 1·HCl was achieved upon exposure to humid HCl gas and heating and their vapochromic behavior was completely different owing to the presence of acidic N-H protons and the addnl. hydrophilic Cl- counteranions in 1·HCl. To the best of the authors’ knowledge, these complexes are the first switchable vapochromic and highly proton conductive materials that can be employed to visualize the proton conducting state by color and luminescence. The results came from multiple reactions, including the reaction of 4′-(4-Pyridyl)-2,2′:6′,2”-terpyridine(cas: 112881-51-3Formula: C20H14N4)

4′-(4-Pyridyl)-2,2′:6′,2”-terpyridine(cas: 112881-51-3) 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. Formula: C20H14N4The 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