Month: October 2022

《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

《A novel multidentate pyridyl ligand: A turn-on fluorescent chemosensor for Hg2+ and its potential application in real sample analysis》 was written by Ngororabanga, Jean Marie Vianney; Moyo, Cyprian B.; Tshentu, Zenixole R.. Application In Synthesis of 2,6-Diaminopyridine And the article was included in Spectrochimica Acta, Part A: Molecular and Biomolecular Spectroscopy in 2020. The article conveys some information:

A novel pyridyl-based ligand with multiple binding sites was developed as potential turn on fluorescent probe for mercuric ion. In comparison with other transition metal ions, the ligand displayed a significant optical selectivity and sensitivity for Hg2+ in aqueous solution with a remarkable fluorescence enhancement. The obtained spectroscopic response was related to the inhibition of the photo-chem. mechanism known as photo-induced electron transfer (PET) in the ligand and C=N isomerization by Hg2+ binding. A good linearity between fluorescence responses and Hg2+ concentration was obtained in the range 3.3 x 10-9 M-1.6 x 10-8 M and a nanomolar level limit of detection (LOD) (1.4 x 10-9 M ∼ 0.28 ppb) and limit of quantification (LOQ) (4.8 x 10-9 M ∼ 0.93 ppb) were obtained. Both LOD and LOQ values are very low compared to the reported permissible Hg2+ level in drinking water (2 ppb) by US Environmental Protection Agency (EPA). The possible binding mode between ligand and Hg2+ were determined using Job′s plot anal. and d. functional theory (DFT) calculations and a complex with 1:1 stoichiometric ratio was suggested. The response of the pyridyl ligand upon Hg2+ addition was noted to be fast without any time delay and reversible. The performance of the ligand at nanomolar level of Hg2+ and real sample application of the proposed method was investigated and satisfactory results were obtained. In the part of experimental materials, we found many familiar compounds, such as 2,6-Diaminopyridine(cas: 141-86-6Application In Synthesis of 2,6-Diaminopyridine)

2,6-Diaminopyridine(cas: 141-86-6) belongs to pyridine. Pyridine and its simple derivatives are stable and relatively unreactive liquids, with strong penetrating odours that are unpleasant.Application In Synthesis of 2,6-Diaminopyridine

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

The author of 《Synthesis and spectroscopic study of some 3-nitropyridines》 were Youssef, Adel F.; Farag, Hassan H.; Youssef, H.. And the article was published in Indian Journal of Chemistry, Section B: Organic Chemistry Including Medicinal Chemistry in 1977. Name: 2-Methyl-3-nitropyridine hydrochloride The author mentioned the following in the article:

6-Methyl-5-nitropyridine-2-carboxylic acid (I), and 3-(2-methyl-3-nitro-6-pyridyl)acrylic acid (II) were prepared The IR, mass and NMR spectra of 2,6-dimethyl-3-nitropyridine, 2-methyl-3-nitropyridine (III) and II were discussed. The structures of I and II were confirmed indirectly via conformation of the structure of their precursor III. II was a mixture of cis-(38%) and trans-(62%) isomers as revealed by its NMR. In the experiment, the researchers used 2-Methyl-3-nitropyridine hydrochloride(cas: 63585-69-3Name: 2-Methyl-3-nitropyridine hydrochloride)

2-Methyl-3-nitropyridine hydrochloride(cas: 63585-69-3) 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.Name: 2-Methyl-3-nitropyridine hydrochloride

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

《A cocrystal of L-ascorbic acid with picolinic acid: the role of O-H···O, N-H···O and C-H···O hydrogen bonds and L-ascorbic acid conformation in structure stabilization》 was written by Evtushenko, Diana N.; Arkhipov, Sergey G.; Fateev, Alexander V.; Izaak, Tatyana I.; Egorova, Lidia A.; Skorik, Nina A.; Vodyankina, Olga V.; Boldyreva, Elena V.. Category: pyridine-derivatives And the article was included in Acta Crystallographica, Section B: Structural Science, Crystal Engineering and Materials in 2020. The article conveys some information:

A new 1:1 cocrystal (L-Asc-Pic) of L-ascorbic acid (vitamin C) with picolinic acid was prepared as a powder and as single crystals. The crystal structure was solved and refined from single-crystal X-ray diffraction (SCXRD) data collected at 293 (2) and 100 (2) K. The samples of the L-Asc-Pic cocrystal were characterized by elemental (HCNS) anal. and titrimetric methods, TG/DTG/DSC, and IR and Raman spectroscopy. The asym. unit comprises a picolinic acid zwitterion and an L-ascorbic acid mol. The stabilization energy of intermol. interactions involving hydrogen bonds, the vibrational spectrum and the energies of the frontier MOs were calculated using the GAUSSIAN09 and the CrystalExplorer17 programs. The charge distribution on the atoms of the L-Asc-Pic cocrystal, L-ascorbic acid itself and its 12 known cocrystals (structures from Version 5.40 of the Cambridge Structural Database) were calculated by the methods of Mulliken, Voronoi and Hirshfeld charge analyses (ADF) at the bp86/TZ2P+ level of theory. The total effective charges and conformations of the L-ascorbic acid mols. in the new and previously reported cocrystals were compared with those of the two symmetry-independent mols. in the crystals of L-ascorbic acid. A correlation between mol. conformation and its effective charge is discussed. In the experiment, the researchers used many compounds, for example, Picolinic acid(cas: 98-98-6Category: pyridine-derivatives)

Picolinic acid(cas: 98-98-6) is used in the preparation of 2-Aminodihydro[1,3]thiazines as BACE 2 inhibitors and their preparation and use in the treatment of diabetes.Category: pyridine-derivatives

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem