Month: February 2022

Application In Synthesis of Pyrazine-2-carboxylic acid. Recently I read an article about STANDARD MOLAR ENTHALPY; STRUCTURE-PROPERTY RELATIONSHIPS; THERMODYNAMIC PROPERTIES; IONIC LIQUIDS; THERMOPHYSICAL PROPERTIES; TEMPERATURE-RANGE; GROUP ADDITIVITY; VAPOR-PRESSURES; THERMAL-ANALYSIS; COMPUTATIONAL THERMOCHEMISTRY, Authors is Naef, R in MDPI in [Naef, Rudolf] Univ Basel, Dept Chem, CH-4003 Basel, Switzerland in 2019, Cited 287. The CAS is 98-97-5. Molecular formula is C5H4N2O2, Through research, I have a further understanding and discovery of Pyrazine-2-carboxylic acid

A universally applicable method for the prediction of the isobaric heat capacities of the liquid and solid phase of molecules at 298.15 K is presented, derived from their true volume. The molecules’ true volume in A(3) is calculated on the basis of their geometry-optimized structure and the Van-der-Waals radii of their constituting atoms by means of a fast numerical algorithm. Good linear correlations of the true volume of a large number of compounds encompassing all classes and sizes with their experimental liquid and solid heat capacities over a large range have been found, although noticeably distorted by intermolecular hydrogen-bond effects. To account for these effects, the total amount of 1303 compounds with known experimental liquid heat capacities has been subdivided into three subsets consisting of 1102 hydroxy-group-free compounds, 164 monoalcohols/monoacids, and 36 polyalcohols/polyacids. The standard deviations for Cp(liq,298) were 20.7 J/mol/K for the OH-free compunds, 22.91 J/mol/K for the monoalcohols/monoacids and 16.03 J/mol/K for the polyols/polyacids. Analogously, 797 compounds with known solid heat capacities have been separated into a subset of 555 OH-free compounds, 123 monoalcohols/monoacids and 119 polyols/polyacids. The standard deviations for Cp(sol,298) were calculated to 23.14 J/mol/K for the first, 21.62 J/mol/K for the second, and 19.75 J/mol/K for the last subset. A discussion of structural and intermolecular effects influencing the heat capacities as well as of some special classes, in particular hydrocarbons, ionic liquids, siloxanes and metallocenes, has been given. In addition, the present method has successfully been extended to enable the prediction of the temperature dependence of the solid and liquid heat capacities in the range between 250 and 350 K.

Application In Synthesis of Pyrazine-2-carboxylic acid. Welcome to talk about 98-97-5, If you have any questions, you can contact Naef, R or send Email.

Reference:
Patent; Chevron Research Company; US4732894; (1988); A;,
Pyrazine – Wikipedia,
Pyrazine | C4H4N2 – PubChem

Safety of Pyrazine-2-carboxylic acid. Recently I read an article about MONOCARBOXYLATE-N-OXIDES; LIQUID-LIQUID-EXTRACTION; 2-PYRAZINECARBOXYLIC ACID; THEORETICAL INSIGHTS; LUMINESCENCE; SEPARATION; EUROPIUM(III); EU3+; LANTHANIDES; SELECTIVITY, Authors is Dumpala, RMR; Boda, A; Kumar, P; Rawat, N; Ali, SM in AMER CHEMICAL SOC in [Dumpala, Rama Mohana Rao; Rawat, Neetika] Bhabha Atom Res Ctr, Radioanalyt Chem Div, Mumbai 400085, Maharashtra, India; [Boda, Anil; Ali, Sk. Musharaf] Bhabha Atom Res Ctr, Chem Engn Div, Mumbai 400085, Maharashtra, India; [Kumar, Pranaw] Bhabha Atom Res Ctr, Fuel Chem Div, Mumbai 400085, Maharashtra, India in 2019, Cited 52. The CAS is 98-97-5. Molecular formula is C5H4N2O2, Through research, I have a further understanding and discovery of Pyrazine-2-carboxylic acid

The denticity, flexibility, and steric hindrance of the ligand are key factors in deciding the mode and number of coordination around a metal ion on complex formation. The thermodynamic aspects of lanthanide complexation with various multidentate ligands provides a significant insight into understand the coordination chemistry of lanthanides in framing the relevant metal organic networks for the applications in biological, biochemical and medical aspects. The pyrazine carboxylic acids are known to form many structurally important complexes and further can form chelates with coordination number of eight for europium in which more water molecules can be knocked out from the primary coordination sphere than demanded by denticity of the ligand. The present studies aimed at ESI-MS characterization and determination of the thermodynamic parameters (log beta, Delta G, Delta H, and Delta S), luminescence properties of europium complexes with pyrazine-2-carboxylate and pyrazine-2,3-dicarboxylate in aqueous solutions by experiment as well as theory. Time resolved luminescence spectroscopy supported by DFT calculations are carried out to optimize the stable geometries of the complexes with various modes of binding and coordination. Furthermore, the thermodynamic parameters estimated theoretically have been used to trace the path of complex formation.

Welcome to talk about 98-97-5, If you have any questions, you can contact Dumpala, RMR; Boda, A; Kumar, P; Rawat, N; Ali, SM or send Email.. Safety of Pyrazine-2-carboxylic acid

Reference:
Patent; Chevron Research Company; US4732894; (1988); A;,
Pyrazine – Wikipedia,
Pyrazine | C4H4N2 – PubChem

Name: Pyrazine-2-carboxylic acid. Recently I read an article about CU-II COMPLEX; MOLECULAR-STRUCTURE; MAGNETIC-PROPERTIES, Authors is Cati, DS; Stoeckli-Evans, H in INT UNION CRYSTALLOGRAPHY in [Cati, Dilovan S.] Debiopharm Int SA, Chemin Messidor 5-7,CP 5911, CH-1002 Lausanne, Switzerland; [Stoeckli-Evans, Helen] Univ Neuchatel, Inst Phys, Rue Emile Argand 11, CH-2000 Neuchatel, Switzerland in 2019, Cited 31. The CAS is 98-97-5. Molecular formula is C5H4N2O2, Through research, I have a further understanding and discovery of Pyrazine-2-carboxylic acid

The title tridentate ligand, C14H10N4O, N-(quinolin-8-yl) pyrazine-2-carboxamide (HL1), crystallizes with three independent molecules (A, B and C) in the asymmetric unit. All three molecules are relatively planar (r.m.s. deviations are 0.068, 0.055 and 0.06 angstrom, respectively), with the NH H atom forming three-centered (bifurcated) intramolecular N-H center dot center dot center dot N hydrogen bonds in each molecule. There is also an intramolecular C-H center dot center dot center dot O contact present in each molecule, involving the benzene ring of the quinoline unit and the amide carboxamide O atom. In the crystal, the three molecules stack in columns with the various molecules being linked by offset pi-pi interactions [intercentroid distances vary from 3.367 (5) to 3.589 (5) angstrom], forming layers parallel to the ab plane. The title complex, [Cu-4(C42H44N8O16)]center dot 2CH(3)OH, {hexa-mu-acetato-1: 2 kappa O-2:O’;2:3 kappa O-8:O’;3:4 kappa O-2:O’-dimethanol-1 kappa O, 2 kappa O-bis[N-(quinolin-8-yl) pyrazine-2-carboxamide]-1 kappa N-3, N’, N ”; 4 kappa(3) N, N’, N ”-tetracopper(II) methanol disolvate} (I), was obtained by the reaction of HL1 with Cu(CH3CO2)(2). It consists of a tetranuclear complex with a central tetrakis(mu-acetato) dicopper paddle-wheel moiety linked on either side via bridging acetato ions to a mononuclear copper(II)-(L1) complex; it crystallizes as a methanol disolvate. The complex possesses inversion symmetry, being located about a center of symmetry situated at the mid-point of the Cu center dot center dot center dot Cu bond of the paddle-wheel moiety. In the crystal, the complex molecules are linked by O-H center dot center dot center dot O hydrogen bonds, forming chains along the [01 (1) over bar] direction, which are linked by offset pi-pi interactions [intercentroid distance = 3.7367 (11) angstrom] and C-H center dot center dot center dot O hydrogen bonds, leading to the formation of a supramolecular framework.

Bye, fridends, I hope you can learn more about C5H4N2O2, If you have any questions, you can browse other blog as well. See you lster.. Name: Pyrazine-2-carboxylic acid

Reference:
Patent; Chevron Research Company; US4732894; (1988); A;,
Pyrazine – Wikipedia,
Pyrazine | C4H4N2 – PubChem

Quality Control of Pyrazine-2-carboxylic acid. Recently I read an article about AQUEOUS-SOLUTION; EQUILIBRIUM-CONSTANTS; CARBOXYLIC-ACIDS; URANIUM(VI); CRYSTAL; ION; CHEMISTRY; LIGAND, Authors is Lv, LN; Chen, BH; Liu, J; Chen, J; Xu, C; Yang, YQ in ROYAL SOC CHEMISTRY in [Lv, Lina; Chen, Baihua; Liu, Jun; Yang, Yanqiu] China Acad Engn Phys, Inst Nucl Phys & Chem, Mianyang 621900, Sichuan, Peoples R China; [Chen, Jing; Xu, Chao] Tsinghua Univ, Inst Nucl & New Energy Technol, Beijing 100084, Peoples R China in 2019, Cited 42. The CAS is 98-97-5. Molecular formula is C5H4N2O2, Through research, I have a further understanding and discovery of Pyrazine-2-carboxylic acid

Complexation of U(vi) with pyridazine-3-carboxylate (PDZ) and pyrazine-2-carboxylate (PAZ) was studied by spectrophotometry, potentiometry and microcalorimetry in 1.0 mol dm(-3) NaClO4. Three complexes, [UO2L](+), UO2L2(aq) and [UO2L3](-), were identified and their stability constants (log) and the corresponding formation enthalpies were determined. The thermodynamic parameters indicate that the formation of the three complexes is endothermic and driven exclusively by entropy. H-1 and C-13-NMR data provide insight into the coordination modes of the complexes which corroborate with the thermodynamic data. Ligands chelate to U(vi) via (2)(N,O) coordination mode in complexes [UO2L](+) and UO2L2(aq). The crystal structures of four U(vi) complexes, [(UO2)(PAZ)(2)(H2O)]H2O(i), [(UO2)(PDZ)(2)(H2O)](ii), [(UO2)(PDZ)(3)Na2ClO4]2H(2)O(iii), and [(UO2)(2)(PDZ)(4)(H2O)(2)]2H(2)O(iv), were determined by single-crystal X-ray diffraction and compared with the U(vi) complex with picolinate (PA) (CH6N3)[UO2(PA)(3)] in the literature. The structure data suggest that the carboxylates coordinate with uranium in O?C-O-U mode. The strengths of the U-O-C-C-N chelate cycles in the U(vi)/L complexes decrease with the trend of PA > PDZ > PAZ, which is in great agreement with the trend of thermodynamic parameters in aqueous solutions. It is interesting that in compound II two PDZ molecules coordinate with U(vi) in cis-planar positions via (2)(N,O) mode, but in other metal complexes of the three ligands having the same (2)(N,O) coordination mode the two ligand molecules are all in trans-arrangement. In the dimeric complex IV, one ligand coordinate with U(vi) in (2)(N,O) mode, while the other does it in (2)-L-(2)(O:O) mode respectively.

Quality Control of Pyrazine-2-carboxylic acid. Bye, fridends, I hope you can learn more about C5H4N2O2, If you have any questions, you can browse other blog as well. See you lster.

Reference:
Patent; Chevron Research Company; US4732894; (1988); A;,
Pyrazine – Wikipedia,
Pyrazine | C4H4N2 – PubChem

Product Details of 98-97-5. Recently I read an article about ANTITUMOR-ACTIVITY; QUINOXALINE DERIVATIVES; THIOPHENE DERIVATIVES; CRYSTAL-STRUCTURE; TUMOR-CELLS; ANTICANCER; CYTOTOXICITY; COPPER(II); INHIBITORS; COMPLEXES, Authors is Zhao, FY; Sun, X; Lu, W; Xu, L; Shi, JZ; Yang, SL; Zhou, MY; Su, F; Lin, F; Cao, FL in TAYLOR & FRANCIS LTD in [Zhao, Fengyi; Xu, Li; Cao, Fuliang] Nanjing Forestry Univ, Coinnovat Ctr Sustainable Forestry Southern China, Nanjing 210037, Peoples R China; [Zhao, Fengyi; Cao, Fuliang] Nanjing Forestry Univ, Coll Forestry, Nanjing, Peoples R China; [Zhao, Fengyi; Sun, Xu; Lu, Wen; Xu, Li; Shi, Jiuzhou] Nanjing Forestry Univ, Coll Sci, Nanjing, Peoples R China; [Sun, Xu] Nanjing Forestry Univ, Coll Informat Sci & Technol, Nanjing, Peoples R China; [Yang, Shilong; Zhou, Mengyi; Su, Fan; Lin, Feng] Nanjing Forestry Univ, Adv Anal & Testing Ctr, Nanjing, Peoples R China in 2020, Cited 60. The CAS is 98-97-5. Molecular formula is C5H4N2O2, Through research, I have a further understanding and discovery of Pyrazine-2-carboxylic acid

Several dehydroabietylamine derivatives containing heterocyclic moieties such as thiophene and pyrazine ring were successfully synthesized. The antiproliferative activities of these thiophene-based Schiff-bases, thiophene amides, and pyrazine amides were investigated in vitro against Hela (cervix), MCF-7 (breast), A549 (lung), HepG2 (liver), and HUVEC (umbilical vein) cells by MTT assay. The toxicity of L-1-L-10 (IC50 = 5.92- >100 mu M) was lower than L-0 (1.27 mu M) and DOX (4.40 mu M) in every case. Compound L-1 had higher anti-HepG2 (0.66 mu M), anti-MCF-7 (5.33 mu M), and anti-A549 (2.11 mu M) and compound L-3 had higher anti-HepG2 (1.63 mu M) and anti-MCF-7 (2.65 mu M) activities. Both of these compounds were recognized with high efficiency in apoptosis induction in HepG2 cells and intercalated binding modes with DNA. Moreover, with average IC50 values of 0.66 and 5.98 mu M, L-1 was nine times more effective at suppressing cultured HepG2 cells viability than normal cells (SI = 9). The relative tumor proliferation rate (T/C) was 38.6%, the tumor inhibition rate was up to 61.2%, which indicated that L-1 had no significant toxicity but high anti-HepG2 activity in vivo. Thus, it may be a potential antiproliferation drug with nontoxic side effects.

Welcome to talk about 98-97-5, If you have any questions, you can contact Zhao, FY; Sun, X; Lu, W; Xu, L; Shi, JZ; Yang, SL; Zhou, MY; Su, F; Lin, F; Cao, FL or send Email.. Product Details of 98-97-5

Reference:
Patent; Chevron Research Company; US4732894; (1988); A;,
Pyrazine – Wikipedia,
Pyrazine | C4H4N2 – PubChem

Quality Control of Pyrazine-2-carboxylic acid. I found the field of Science & Technology – Other Topics very interesting. Saw the article Immunological detection of pyrazine-2-carboxylic acid for the detection of pyrazinamide resistance in Mycobacterium tuberculosis published in 2020, Reprint Addresses Sheen, P (corresponding author), Univ Peruana Cayetano Heredia, Fac Ciencias & Filosofia, Lab Invest & Desarrollo, Lab Bioinformat & Biol Mol, Lima, Peru.. The CAS is 98-97-5. Through research, I have a further understanding and discovery of Pyrazine-2-carboxylic acid.

Pyrazinamide (PZA) susceptibility testing in Mycobacterium tuberculosis (Mtb) is a current area of development and PZA-resistant strains are increasingly prevalent. Previous studies have demonstrated that the detection of pyrazinoic acid (POA), the metabolite produced by the deamidation of PZA, is a good predictor for PZA resistance since a resistant strain would not convert PZA into POA at a critical required rate, whereas a susceptible strain will do, expelling POA to the extracellular environment at a certain rate, and allowing for quantification of this accumulated analyte. In order to quantify POA, an indirect competitive ELISA (icELISA) test using hyperimmune polyclonal rabbit serum against POA was developed: for this purpose, pure POA was first covalently linked to the highly immunogenic Keyhole Limpet Hemocyanine, and inoculated in rabbits. A construct made of bovine serum albumin (BSA) linked to pure POA and fixed at the bottom of wells was used as a competitor against spiked samples and liquid Mtb culture supernatants. When spiked samples (commercial POA alone) were analyzed, the half maximal inhibitory concentration (IC50) was 1.16 mg/mL, the limit of detection 200 mu g/mL and the assay was specific (it did not detect PZA, IC50 > 20 mg/mL). However, culture supernatants (7H9-OADC-PANTA medium) disrupted the competition and a proper icELISA curve was not obtainable. We consider that, although we have shown that it is feasible to induce antibodies against POA, matrix effects could damage its analytical usefulness; multiple, upcoming ways to solve this obstacle are suggested.

Welcome to talk about 98-97-5, If you have any questions, you can contact Florentini, EA; Angulo, N; Gilman, RH; Alcantara, R; Roncal, E; Antiparra, R; Toscano, E; Vallejos, K; Kirwan, D; Zimic, M; Sheen, P or send Email.. Quality Control of Pyrazine-2-carboxylic acid

Reference:
Patent; Chevron Research Company; US4732894; (1988); A;,
Pyrazine – Wikipedia,
Pyrazine | C4H4N2 – PubChem

Safety of Pyrazine-2-carboxylic acid. I found the field of Pharmacology & Pharmacy; Chemistry very interesting. Saw the article Synthesis of novel of 2, 5-disubstituted 1, 3, 4-oxadiazole derivatives and their in vitro anti-inflammatory, anti-oxidant evaluation, and molecular docking study published in 2020, Reprint Addresses Ghanwat, AA (corresponding author), Solapur Univ, Sch Chem Sci, Chem Res Lab, Solapur 413255, India.. The CAS is 98-97-5. Through research, I have a further understanding and discovery of Pyrazine-2-carboxylic acid.

A series of novel 2, 5-disubstituted 1, 3, 4-Oxadiazole derivatives as a potential anti-inflammatory, and antioxidant agent were synthesized via cyclisation. Hydrazide molecule treated with substituted acids in the presence of phosphorus oxychloride (POCl3) as an efficient reagent as well as solvent by conventional method with shorter reaction time and excellent yield. The newly synthesized 1, 3, 4-oxadiazole derivatives exhibited excellent to good anti-inflammatory and anti-oxidant activities compaired to the standard drugs. Molecular docking study on the crucial anti-inflammatory target-cyclooxygenase-2 (COX-2) revealed the ability of the scaffold to correctly recognize the active site and achieve significant bonded and non-bonded interactions with key residues therein. This study could identify potential compounds which can be pertinent starting points for structure-based drug design to obtain newer anti-inflammatory agents.

Safety of Pyrazine-2-carboxylic acid. Welcome to talk about 98-97-5, If you have any questions, you can contact Kashid, BB; Salunkhe, PH; Dongare, BB; More, KR; Khedkar, VM; Ghanwat, AA or send Email.

Reference:
Patent; Chevron Research Company; US4732894; (1988); A;,
Pyrazine – Wikipedia,
Pyrazine | C4H4N2 – PubChem

SDS of cas: 98-97-5. I found the field of Pharmacology & Pharmacy very interesting. Saw the article Cell-Based Optimization of Covalent Reversible Ketoamide Inhibitors Bridging the Unprimed to the Primed Site of the Proteasome beta 5 Subunit published in 2019, Reprint Addresses Schmidt, B (corresponding author), Tech Univ Darmstadt, Clemens Schoepf Inst Organ Chem & Biochem, Alarich Weiss Str 4, D-64287 Darmstadt, Germany.. The CAS is 98-97-5. Through research, I have a further understanding and discovery of Pyrazine-2-carboxylic acid.

The ubiquitin-proteasome system (UPS) is an established therapeutic target for approved drugs to treat selected hematologic malignancies. While drug discovery targeting the UPS focuses on irreversibly binding epoxyketones and slowly-reversibly binding boronates, optimization of novel covalent-reversibly binding warheads remains largely unattended. We previously reported alpha-ketoamides to be a promising reversible lead motif, yet the cytotoxic activity required further optimization. This work focuses on the lead optimization of phenoxy-substituted alpha-ketoamides combining the structure-activity relationships from the primed and the non-primed site of the proteasome beta 5 subunit. Our optimization strategy is accompanied by molecular modeling, suggesting occupation of P1 ‘ by a 3-phenoxy group to increase beta 5 inhibition and cytotoxic activity in leukemia cell lines. Key compounds were further profiled for time-dependent inhibition of cellular substrate conversion. Furthermore, the alpha-ketoamide lead structure 27 does not affect escape response behavior in Danio rerio embryos, in contrast to bortezomib, which suggests increased target specificity.

SDS of cas: 98-97-5. About Pyrazine-2-carboxylic acid, If you have any questions, you can contact Stubba, D; Bensinger, D; Steinbacher, J; Proskurjakov, L; Gomez, AS; Schmidt, U; Roth, S; Schmitz, K; Schmidt, B or concate me.

Reference:
Patent; Chevron Research Company; US4732894; (1988); A;,
Pyrazine – Wikipedia,
Pyrazine | C4H4N2 – PubChem

Safety of Pyrazine-2-carboxylic acid. I found the field of Microbiology very interesting. Saw the article MODS-Wayne, a Colorimetric Adaptation of the Microscopic-Observation Drug Susceptibility (MODS) Assay for Detection of Mycobacterium tuberculosis Pyrazinamide Resistance from Sputum Samples published in 2019, Reprint Addresses Sheen, P (corresponding author), Univ Peruana Cayetano Heredia, Lab Bioinformat & Biol Mol, Fac Ciencias & Filosofia, Lima, Peru.. The CAS is 98-97-5. Through research, I have a further understanding and discovery of Pyrazine-2-carboxylic acid.

Although pyrazinamide (PZA) is a key component of first- and second-line tuberculosis treatment regimens, there is no gold standard to determine PZA resistance. Approximately 50% of multidrug-resistant tuberculosis (MDR-TB) and over 90% of extensively drug-resistant tuberculosis (XDR-TB) strains are also PZA resistant. pncA sequencing is the endorsed test to evaluate PZA susceptibility. However, molecular methods have limitations for their wide application. In this study, we standardized and evaluated a new method, MODS-Wayne, to determine PZA resistance. MODS-Wayne is based on the detection of pyrazinoic acid, the hydrolysis product of PZA, directly in the supernatant of sputum cultures by detecting a color change following the addition of 10% ferrous ammonium sulfate. Using a PZA concentration of 800 mu g/ml, sensitivity and specificity were evaluated at three different periods of incubation (reading 1, reading 2, and reading 3) using a composite reference standard (MGIT-PZA, pncA sequencing, and the classic Wayne test). MODS-Wayne was able to detect PZA resistance, with a sensitivity and specificity of 92.7% and 99.3%, respectively, at reading 3. MODS-Wayne had an agreement of 93.8% and a kappa index of 0.79 compared to the classic Wayne test, an agreement of 95.3% and kappa index of 0.86 compared to MGIT-PZA, and an agreement of 96.9% and kappa index of 0.90 compared to pncA sequencing. In conclusion, MODS-Wayne is a simple, fast, accurate, and inexpensive approach to detect PZA resistance, making this an attractive assay especially for low-resource countries, where TB is a major public health problem.

Welcome to talk about 98-97-5, If you have any questions, you can contact Alcantara, R; Fuentes, P; Antiparra, R; Santos, M; Gilman, RH; Kirwan, DE; Zimic, M; Sheen, P or send Email.. Safety of Pyrazine-2-carboxylic acid

Reference:
Patent; Chevron Research Company; US4732894; (1988); A;,
Pyrazine – Wikipedia,
Pyrazine | C4H4N2 – PubChem

SDS of cas: 98-97-5. I found the field of Materials Science; Optics very interesting. Saw the article Controllable luminescent behaviors with pyrazine and benzimidazole groups: Syntheses, crystal structures and properties published in 2019, Reprint Addresses Wang, YT (corresponding author), Qilu Univ Technol, Shandong Acad Sci, Dept Chem Engn, Jinan 250353, Shandong, Peoples R China.. The CAS is 98-97-5. Through research, I have a further understanding and discovery of Pyrazine-2-carboxylic acid.

A set of new salts containing benzimidazole and pyrazine groups, namely, [HPZBI]X-+(-) nH(2)O (X = Cl (n = 1) (1), NO3 (n = 1) (2), ClO4 (n = 0) (3) and H2PO4 (n = 0) (4)) [PZBI = 2-(pyrazin-2-yl)-1H-benzimidazole], were obtained by the reaction of PZBI and a set of inorganic acid, respectively. The emission maxima can be found at 444, 472, 471, 432 and 443 nm for PZBI and its compounds 1-4 in the solid state at room temperature, respectively. Compared with the free PZBI, the emission maxima of compounds 1-4 are obviously blue/red-shifted for 1-4, indicating that the emission maxima are relative to the intermolecular packing distances. Their photoluminescent lifetime and quantum yield are 1.10 ns and 24.5% for 1, 0.99 ns and 26.4% for 2, 0.94 ns and 21.65% for 3, 2.86 ns and 20.57% for 4, respectively. Compounds 1-4 were structurally characterized by X-ray single crystal diffraction, FT-IR, and UV-Vis spectra. Single crystal X-ray diffraction reveals that pi center dot center dot center dot pi packing interactions and a set of hydrogen bonds can be observed. The shortest distances of pi center dot center dot center dot pi stacking interactions are 3.613, 3.534, 3.731 and 3.492 angstrom in compounds 1-4, respectively. Additionally, the thermal stabilities of compounds 1-4 were investigated in detail.

SDS of cas: 98-97-5. About Pyrazine-2-carboxylic acid, If you have any questions, you can contact Wang, YT; Wu, YS; Tang, GM or concate me.

Reference:
Patent; Chevron Research Company; US4732894; (1988); A;,
Pyrazine – Wikipedia,
Pyrazine | C4H4N2 – PubChem