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Journal articles on the topic '4-b]-pyrazin'

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Published: 4 June 2021

Last updated: 1 February 2022

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1

Safieh, Kayed A. Abu, Feda’a S. Al-Masri, Mikdad T. Ayoub, Mustafa M. El-Abadelah, and Wolfgang Voelter. "Synthesis of Some 1,3-Dimethyl-6-substituted-1H-pyrazolo[3,4-b]pyrazin-5(4H)-ones." Zeitschrift für Naturforschung B 66, no. 11 (November 1, 2011): 1136–40. http://dx.doi.org/10.1515/znb-2011-1109.

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A series of new 6-substituted-1,3-dimethyl-1H-pyrazolo[3,4-b]pyrazin-5(4H)-ones (13a - e) and 1,3-dimethyl-5a,6a,7,8-tetrahydro-1H-pyrazolo[4,3-e]pyrrolo[1,2-a]pyrazin-5(4H)-one (15) have been synthesized. The synthetic strategy involves direct interaction of D,L-α-amino acids with 5- chloro-1,3-dimethyl-4-nitro-1H-pyrazole (10) to produce the respective N-(1,3-dimethyl-4-nitro-1Hpyrazol- 5-yl) D,L-α-amino acids 11a - e and 14. The latter compounds underwent reductive lactamization to deliver the corresponding target heterocyclic systems 13a - e and 15

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2

Koch, Pierre, Dieter Schollmeyer, and Stefan Laufer. "N-{4-[3-(4-Fluorophenyl)pyrido[2,3-b]pyrazin-2-yl]-2-pyridyl}isopropylamine." Acta Crystallographica Section E Structure Reports Online 65, no. 10 (September 26, 2009): o2557. http://dx.doi.org/10.1107/s1600536809038173.

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3

Mehta, Vaibhav P., Sachin G. Modha, Denis Ermolat'ev, Kristof Van Hecke, Luc Van Meervelt, and Erik V. Van der Eycken. "Diversity-Oriented Synthesis of Substituted Furo[2,3-b]pyrazines." Australian Journal of Chemistry 62, no. 1 (2009): 27. http://dx.doi.org/10.1071/ch08376.

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A highly efficient method for the synthesis of diversely substituted furo[2,3-b]pyrazines has been elaborated. The Ag+- or iodine-mediated electrophilic cyclization of readily generated 5-chloro-3-substituted ethynyl-1-(4-methoxybenzyl)-pyrazin-2(1H)-ones affords substituted furo[2,3-b]pyrazines, which undergo various palladium catalyzed reactions to generate a library of difficult to attain diversely substituted furo[2,3-b]pyrazines.

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4

Childs, Bradley J., John M. Cadogan, Donald C. Craig, Marcia L. Scudder, and Harold A. Goodwin. "Electronic and Structural Properties of Iron(II) and Nickel(II) Cationic Complexes of 2-(Pyrazin-2-ylamino)-4-(pyridin-2-yl)thiazole." Australian Journal of Chemistry 50, no. 2 (1997): 129. http://dx.doi.org/10.1071/c96185.

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Complex salts containing the [FeIIN6]2+ derivative of 2-(pyrazin-2-ylamino)-4-(pyridin-2-yl)thiazole (pzaptH) undergo continuous, temperature-induced singlet (1A1) quintet (5T2) transitions with the transition temperature being dependent on the nature of the counter anion and the presence of solvate water, the latter tending to stabilize the singlet state. A transition is also observed for the fluoroborate salt in methanol solution. The extent of stabilization of the singlet state for iron(II) in these complexes is somewhat greater than in those derived from the previously studied 2-(pyridin-2-ylamino)-4-(pyridin-2-yl)thiazole. The crystal structures of [Fe(pzaptH)2] [CF3SO3]2 and [Ni(pzaptH)2] [BF4]2.2H2O have been determined. The average Fe-N distance is 1·985 Å, a value consistent with the essentially low-spin nature of the complex at room temperature, and the average Ni-N distance is 2·089 Å. In both complexes the bridging >NH group is involved in hydrogen bonding to the anions and, in the nickel complex, also to the solvate water. The uncoordinated nitrogen of the pyrazine ring is not hydrogen-bonded. Bis[2-(pyrazin-2-ylamino)-4-(pyridin-2-yl)thiazole]iron(II) triflate: triclinic, space group P -1, a 8·794(5), b 11·082(6), c 17·49(1) Å, α 77·59(4), β 86·80(4), γ 84·21(4)°, Z 2. Bis[2-(pyrazin-2-ylamino)-4-(pyridin-2-yl)thiazole]nickel(II) tetrafluoroborate dihydrate: monoclinic, space group P 21/c, a 8·784(3), b 8·795(2), c 41·16(1) Å, β 94·58(2)°, Z 4.

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5

Peters, David A., Roy L. Beddoes, and John A. Joule. "Alternative synthesis of 6-(3-methoxybenzyl)pyrazin-2(1H)-one. Synthesis of indeno[1,2-b]pyrazin-2-ones. Crystal structures of 5-acetoxy-1-benzyl-4-tert-butoxycarbonyl-6-(3-methoxybenzylidene)piperazin-2-one, 1-benzyl-4-tert-butoxycarbonyl-7-methoxy-1,3,4,4a-tetrahydroindeno[1,2-b]pyrazin-2-one and 1-benzyl-4-tert-butoxycarbonyl-7-methoxy-1,3,4,9-tetrahydroindeno[1,2-b]pyrazin-2-one." Journal of the Chemical Society, Perkin Transactions 1, no. 11 (1993): 1217. http://dx.doi.org/10.1039/p19930001217.

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6

Choi, Kyung Hyun, Jae Min Kim, Won Jae Chung, and Jun Yeob Lee. "Effects of Substitution Position of Carbazole-Dibenzofuran Based High Triplet Energy Hosts to Device Stability of Blue Phosphorescent Organic Light-Emitting Diodes." Molecules 26, no. 9 (May 10, 2021): 2804. http://dx.doi.org/10.3390/molecules26092804.

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High triplet energy hosts were developed through the modification of the substitution position of carbazole units. Two carbazole-dibenzofuran-derived compounds, 9,9′-(dibenzo[b,d]furan-2,6-diyl)bis(9H-carbazole) (26CzDBF) and 4,6-di(9H-carbazol-9-yl)dibenzo[b,d]furan (46CzDBF), were synthesized for achieving high triplet energy hosts. In comparison with the reported hole transport type host, 2,8-di(9H-carbazol-9-yl)dibenzo[b,d]furan (28CzDBF), 26CzDBF and 46CzDBF maintained high triplet energy over 2.95 eV. The device performances of the hosts were evaluated with electron transport type host, 2-phenyl-4, 6-bis(3-(triphenylsilyl)phenyl)-1,3,5-triazine (mSiTrz), to comprise a mixed host system. The deep blue phosphorescent device of 26CzDBF:mSiTrz with [[5-(1,1-dimethylethyl)-3-phenyl-1H-imidazo[4,5-b]pyrazin-1-yl-2(3H)-ylidene]-1,2-phenylene]bis[[6-(1,1-dimethylethyl)-3-phenyl-1H-imidazo[4,5-b]pyrazin-1-yl-2(3H)-ylidene]-1,2-phenylene]iridium (Ir(cb)3) dopant exhibited high external quantum efficiency of 22.9% with a color coordinate of (0.14, 0.16) and device lifetime of 1400 h at 100 cd m−2. The device lifetime was extended by 75% compared to the device lifetime of 28CzDBF:mSiTrz (800 h). These results demonstrated that the asymmetric and symmetric substitution of carbazole can make differences in the device performance of the carbazole- and dibenzofuran- derived hosts.

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7

Blass, Benjamin. "N-[4-(1H-Pyrazolo[3,4-B]pyrazin-6yl)-phenyl]-sulonamides and Their Use As Pharmaceuticals." ACS Medicinal Chemistry Letters 4, no. 11 (October 11, 2013): 1022–24. http://dx.doi.org/10.1021/ml400389a.

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8

Childs, BJ, DC Craig, KA Ross, ML Scudder, and HA Goodwin. "Structural and Electronic Properties of Bis[2-(pyrazin-2-ylamino)-4-(pyridin-2-yl)thiazolato]iron(II) and Its Solvated Derivatives." Australian Journal of Chemistry 47, no. 5 (1994): 891. http://dx.doi.org/10.1071/ch9940891.

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The uncharged complex [Fe( pzapt )2] [ pzapt is the deprotonated form of 2-(pyrazin-2-ylamino)-4-(pyridin-2-yl) thiazole ] crystallizes with varying degrees of solvation , depending on the solvent. The electronic properties of the solvates differ. For all of them temperature dependence of the magnetic moment is observed, associated with a continuous temperature-induced singlet (1A1) ↔ quintet (5T2) transition. The transition is centred below room temperature for the benzene solvates but the unsolvated and chloroform solvate complexes exist predominantly in a singlet low-spin state. Overall the stabilization of the singlet state is greater in this system than in the previously studied [Fe( papt )2] [ paptH = 2-(pyridin-2-ylamino)-4-(pyridin-2-yl) thiazole ]. A spin equilibrium has been characterized for both [Fe( pzapt )2] and [Fe( papt )2] in methanol solution. The crystal structure of [Fe( pzapt )2].3/2C6H6 reveals Fe-N bond lengths consistent with both singlet and quintet state iron(II) being present. The benzene molecules are incorporated into the lattice as groups of three by occupying channels created by the packing of the complex molecules. Bis [2-(pyrazin-2-ylamino)-4-(pyridin-2-yl) thiazole ]iron(II) sesquibenzene solvate: monoclinic, space group P 21/c, a 14.894(7), b 12.601(2), c 16.777(8) Ǻ, β 94.57(2)°, Z 4.

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9

Yamashita, Yoshiro, Kenichi Saito, Takanori Suzuki, Chizuko Kabuto, Toshio Mukai, and Tsutomu Miyashi. "Bis([1,2,5]thiadiazolo)[3,4-b;3′,4′-e]pyrazin, ein neuer Heterocyclus mit 14 π-Elektronen und hoher Elektronenaffinität." Angewandte Chemie 100, no. 3 (March 1988): 428–29. http://dx.doi.org/10.1002/ange.19881000328.

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10

Temple, Carroll, and Gregory A. Rener. "Antimitotic agents. Chiral isomers of ethyl 5-amino-1,2-dihydro-3-(4-hydroxyphenyl)-2-methylpyrido[3,4-b]pyrazin-7-ylcarbamate." Journal of Medicinal Chemistry 35, no. 6 (March 1992): 988–93. http://dx.doi.org/10.1021/jm00084a003.

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11

Halland, Nis, Friedemann Schmidt, Tilo Weiss, Joachim Saas, Ziyu Li, Jörg Czech, Matthias Dreyer, et al. "Discovery of N-[4-(1H-Pyrazolo[3,4-b]pyrazin-6-yl)-phenyl]-sulfonamides as Highly Active and Selective SGK1 Inhibitors." ACS Medicinal Chemistry Letters 6, no. 1 (October 23, 2014): 73–78. http://dx.doi.org/10.1021/ml5003376.

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12

Wang, Yanling, Qiang Peng, Ping He, Zaifang Li, Ying Liang, and Benlin Li. "Theoretical Design Study on Photophysical Properties of Light-emitting Pyrido[3,4-b]pyrazine-based Oligomers." Australian Journal of Chemistry 65, no. 2 (2012): 169. http://dx.doi.org/10.1071/ch11427.

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The electronic structures, charge injection and transport, and absorption and emission properties of four series of dimethylpyrido[3,4-b]pyrazine-based oligomers (5-(5,5-dimethyl-5H-dibenzo[b,d]silol-3-yl)-2,3-dimethylpyrido[3,4-b]pyrazine)n (SPP)n, (5-(dibenzo[b,d]thiophen-3-yl)-2,3-dimethylpyrido[3,4-b]pyrazine)n (TPP)n, (5-(9,9-dimethyl-9H-fluoren-2-yl)-2,3-dimethylpyrido[3,4-b]pyrazine)n (FPP)n, (2-(2,3-dimethylpyrido[3,4-b]pyrazin-5-yl)-9-methyl-9H-carbazole)n (PPC)n were investigated by the density functional theory approach. The ground-state geometries of (SPP)n, (TPP)n, (FPP)n and (PPC)n (n = 1–4) were optimized at the B3LYP/6–31G(d) level. The energies of the HOMO, LUMO and HOMO–LUMO energy gaps of (SPP)n, (TPP)n, (FPP)n and (PPC)n (n = 1–4) were obtained by a linear extrapolation method. Further, calculations of ionization potential, electronic affinity and reorganization energy were used to evaluate charge injection and transport abilities. For (SPP)n, (TPP)n, (FPP)n and (PPC)n (n = 1–4), the time-dependent density functional theory (TDDFT) calculation results revealed that the absorption peaks can be characterized as π–π* transitions and are coupled with the location of electron density distribution change in different repeat units. All the primary theoretical investigations are intended to establish structure–property relationships, which can provide guidance in designing and preparing novel efficient organic light-emitting materials with a high performance.

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13

Douka, Matina D., and Konstantinos E. Litinas. "One-pot synthesis of 5H-chromeno[3,4-b]pyrazin-5-one derivatives from 4-amino-3-nitrocoumarin and α-dicarbonyl compounds." Arkivoc 2021, no. 8 (April 11, 2021): 107–18. http://dx.doi.org/10.24820/ark.5550190.p011.432.

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14

PETERS, D. A., R. L. BEDDOES, and J. A. JOULE. "ChemInform Abstract: Alternative Synthesis of 6-(3-Methoxybenzyl)pyrazin-2(1H)-one. Synthesis of Indeno(1,2-b)pyrazin-2-ones. Crystal Structures of 5- Acetoxy-1-benzyl-4-tert-butoxycarbonyl-6-(3-methoxybenzylidene) piperazin-2-one, 1-Benzyl-4-tert-butoxyc." ChemInform 24, no. 40 (August 20, 2010): no. http://dx.doi.org/10.1002/chin.199340226.

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15

Liu, Wen, Liping Wang, Bin Wang, Yanchao Xu, Guoliang Zhu, Mengmeng Lan, Weiming Zhu, and Kunlai Sun. "Diketopiperazine and Diphenylether Derivatives from Marine Algae-Derived Aspergillus versicolor OUCMDZ-2738 by Epigenetic Activation." Marine Drugs 17, no. 1 (December 22, 2018): 6. http://dx.doi.org/10.3390/md17010006.

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A chemical-epigenetic method was used to enhance the chemodiversity of a marine algicolous fungus. Apart from thirteen known compounds, (+)-brevianamide R ((+)-3), (‒)-brevianamide R ((‒)-3), (+)-brevianamide Q ((+)-4), (‒)-brevianamide Q ((‒)-4), brevianamide V ((+)-5), brevianamide W ((‒)-5), brevianamide K (6), diorcinol B (7), diorcinol C (8), diorcinol E (9), diorcinol J (10), diorcinol (11), 4-methoxycarbonyldiorcinol (12), two new compounds, (+)- and (‒)-brevianamide X ((+)- and (‒)- 2)), as well as a new naturally occurring one, 3-[6-(2-methylpropyl)-2-oxo-1H-pyrazin-3-yl]propanamide (1), were isolated from chemical-epigenetic cultures of Aspergillus versicolor OUCMDZ-2738 with 10 µM vorinostat (SAHA). Compared to cultures in the same medium without SAHA, compounds 1–4, 8, 9, 11, and 12 were solely observed under SAHA condition. The structures of these compounds were elucidated based on spectroscopic analysis, specific rotation analysis, ECD, and X-ray crystallographic analysis. (±)-3, (±)-4, and (±)-5 were further resolved into the corresponding optically pure enantiomers and their absolute configurations were determined for the first time. Compounds 11 and 12 showed selective antibacterial against Pseudomonas aeruginosa with a minimum inhibitory concentration (MIC) of 17.4 and 13.9 μM, respectively. Compound 10 exhibited better α-glucosidase inhibitory activity than the assay control acarbose with IC50 values of 117.3 and 255.3 μM, respectively.

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16

Hughes, Robert O., John K. Walker, D. Joseph Rogier, Steve E. Heasley, Rhadika M. Blevis-Bal, Alan G. Benson, E. Jon Jacobsen, et al. "Optimization of the aminopyridopyrazinones class of PDE5 inhibitors: Discovery of 3-[(trans-4-hydroxycyclohexyl)amino]-7-(6-methoxypyridin-3-yl)-1-(2-propoxyethyl)pyrido[3,4-b]pyrazin-2(1H)-one." Bioorganic & Medicinal Chemistry Letters 19, no. 17 (September 2009): 5209–13. http://dx.doi.org/10.1016/j.bmcl.2009.07.019.

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17

Stehouwer, Jeffrey S., Chase H. Bourke, Michael J. Owens, Ronald J. Voll, Clinton D. Kilts, and Mark M. Goodman. "Synthesis, binding affinity, radiolabeling, and microPET evaluation of 4-(2-substituted-4-substituted)-8-(dialkylamino)-6-methyl-1-substituted-3,4-dihydropyrido[2,3-b]pyrazin-2(1H)-ones as ligands for brain corticotropin-releasing factor type-1 (CRF1) receptors." Bioorganic & Medicinal Chemistry Letters 25, no. 22 (November 2015): 5111–14. http://dx.doi.org/10.1016/j.bmcl.2015.10.010.

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18

Hughes, Robert O., D. Joseph Rogier, E. Jon Jacobsen, John K. Walker, Alan MacInnes, Brian R. Bond, Lena L. Zhang, et al. "Design, Synthesis, and Biological Evaluation of 3-[4-(2-Hydroxyethyl)piperazin-1-yl]-7-(6-methoxypyridin-3-yl)-1-(2-propoxyethyl)pyrido[3,4-b]pyrazin-2(1H)-one, a Potent, Orally Active, Brain Penetrant Inhibitor of Phosphodiesterase 5 (PDE5)." Journal of Medicinal Chemistry 53, no. 6 (March 25, 2010): 2656–60. http://dx.doi.org/10.1021/jm901781q.

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19

Bandaru, Siva Sankar Murthy, Anant Ramakant Kapdi, and Carola Schulzke. "Crystal structure of 4-(pyrazin-2-yl)morpholine." Acta Crystallographica Section E Crystallographic Communications 74, no. 2 (January 12, 2018): 137–40. http://dx.doi.org/10.1107/s2056989018000312.

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The molecular structure of the title compound, C8H11N3O, is nearly planar despite the chair conformation of the morpholine moiety. In the crystal, the molecules form sheets parallel to the b axis, which are supported by non-classical hydrogen-bonding interactions between C—H functionalities and the O atom of morpholine and the 4-N atom of pyrazine, respectively. The title compound crystallizes in the monoclinic space group P21/c with four molecules in the unit cell.

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20

Jia, Xiao Chun, Chun Chen, Xiang Li, Bin Zhang, and Yan Yan Yu. "Crystal structure of di(pyrazin-2-yl)sulfane, C8H6N4S." Zeitschrift für Kristallographie - New Crystal Structures 228, no. 3 (October 1, 2013): 325–26. http://dx.doi.org/10.1524/ncrs.2013.0158.

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21

Cui, J. Jean, Michele McTigue, Mitchell Nambu, Michelle Tran-Dubé, Mason Pairish, Hong Shen, Lei Jia, et al. "Discovery of a Novel Class of Exquisitely Selective Mesenchymal-Epithelial Transition Factor (c-MET) Protein Kinase Inhibitors and Identification of the Clinical Candidate 2-(4-(1-(Quinolin-6-ylmethyl)-1H-[1,2,3]triazolo[4,5-b]pyrazin-6-yl)-1H-pyrazol-1-yl)ethanol (PF-04217903) for the Treatment of Cancer." Journal of Medicinal Chemistry 55, no. 18 (September 10, 2012): 8091–109. http://dx.doi.org/10.1021/jm300967g.

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Cui, J. Jean, Michele McTigue, Mitchell Nambu, Michelle Tran-Dubé, Mason Pairish, Hong Shen, Lei Jia, et al. "Correction to Discovery of a Novel Class of Exquisitely Selective Mesenchymal-Epithelial Transition Factor (c-MET) Protein Kinase Inhibitors and Identification of the Clinical Candidate 2-(4-(1-(Quinolin-6-ylmethyl)-1H-[1,2,3]triazolo[4,5-b]pyrazin-6-yl)-1H-pyrazol-1-yl)ethanol (PF-04217903) for the Treatment of Cancer." Journal of Medicinal Chemistry 55, no. 22 (October 19, 2012): 10314. http://dx.doi.org/10.1021/jm3014647.

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23

Fan, Hui-Tao, Shu-Guang Qi, Shan-Shan Liu, and Ling Zhao. "Crystal structure of poly[(μ3-2-(pyrazin-2-ylthio)acetato-κ3N:O:S)silver(I)], C6H5AgN2O2S." Zeitschrift für Kristallographie - New Crystal Structures 232, no. 4 (July 26, 2017): 637–38. http://dx.doi.org/10.1515/ncrs-2016-0385.

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24

Payne, Joseph E., Céline Bonnefous, Kent T. Symons, Phan M. Nguyen, Marciano Sablad, Natasha Rozenkrants, Yan Zhang, et al. "Discovery of Dual Inducible/Neuronal Nitric Oxide Synthase (iNOS/nNOS) Inhibitor Development Candidate 4-((2-Cyclobutyl-1H-imidazo[4,5-b]pyrazin-1-yl)methyl)-7,8-difluoroquinolin-2(1H)-one (KD7332) Part 2: Identification of a Novel, Potent, and Selective Series of Benzimidazole-Quinolinone iNOS/nNOS Dimerization Inhibitors That Are Orally Active in Pain Models." Journal of Medicinal Chemistry 53, no. 21 (November 11, 2010): 7739–55. http://dx.doi.org/10.1021/jm100828n.

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25

Li, Qingqing, Kaichuang Jiao, and Zhouqing Xu. "Crystal structure of bis(N-(1-(pyrazin-2-yl)ethylidene)nicotinohydrazonato-κ3N,N′,O)copper(II) C24H20N10O2Cu." Zeitschrift für Kristallographie - New Crystal Structures 233, no. 4 (July 26, 2018): 669–70. http://dx.doi.org/10.1515/ncrs-2017-0432.

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Hao, Zhen-Li, and Cun-Han Huang. "Crystal structure of bis(3-chloro-N-(1-(pyrazin-2-yl)ethylidene)benzohydrazonato-k3N,N′,O)nickel(II), C26H20N8O2Cl2Ni." Zeitschrift für Kristallographie - New Crystal Structures 235, no. 2 (February 25, 2020): 477–78. http://dx.doi.org/10.1515/ncrs-2019-0778.

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Li, Li. "Crystal structure of bis[3-methoxy-N-(1-(pyrazin-2-yl)ethylidene)benzohydrazonato-κ3O,N,N′]nickel(II), C28H26N8O4Ni." Zeitschrift für Kristallographie - New Crystal Structures 235, no. 5 (August 26, 2020): 1063–64. http://dx.doi.org/10.1515/ncrs-2020-0170.

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Yang, Xue-Mei, Tao Zhu, and Long Lin. "Crystal structure of bis(3-methyl-N-(1-(pyrazin-2-yl)ethylidene)benzohydrazonato-κ3O,N,N′)nickel(II), C28H26N8O2Ni." Zeitschrift für Kristallographie - New Crystal Structures 235, no. 3 (April 28, 2020): 585–86. http://dx.doi.org/10.1515/ncrs-2019-0833.

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29

Zhang, Ning, Meijie Su, Gaoyuan Xu, and Huijun Li. "Crystal structure of bis(N-(1-(pyrazin-2-yl)ethylidene)nicotinohydrazonato-κ3N,N′,O)cadmium(II) – methanol (1/1), C26H28N10O4Zn." Zeitschrift für Kristallographie - New Crystal Structures 233, no. 5 (August 28, 2018): 799–800. http://dx.doi.org/10.1515/ncrs-2017-0431.

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Liu, Jing. "Crystal structure of trans-diaqua-bis(3-(pyrazin-2-yl)-5-(pyridin-4-yl)1,2,4-triazol-1-ido-κ2N,N′)-cobalt(II),C22H18CoN12O2." Zeitschrift für Kristallographie - New Crystal Structures 231, no. 2 (June 1, 2016): 365–67. http://dx.doi.org/10.1515/ncrs-2014-9083.

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31

Wang, Wan-Wan, Xiao-Wei Deng, and Wei-Na Wu. "Crystal structure of bis [1-(phenylsulfonyl)-2-(1-(pyrazin-2-yl)ethylidene)hydrazin-1-ido-κ3N,N′,O]cobalt(II), C24H22N8O4S2Co." Zeitschrift für Kristallographie - New Crystal Structures 235, no. 4 (June 25, 2020): 763–64. http://dx.doi.org/10.1515/ncrs-2019-0611.

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32

Xiangqing, Fang, Wang Ren, Du Kai, Gu Jia, and Yang Liguo. "Crystal structure of N′2,N′6-bis((E)-1-(pyrazin-2-yl)ethylidene)pyridine-2,6-dicarbohydrazide — methanol (1/2), C21H25N9O4." Zeitschrift für Kristallographie - New Crystal Structures 235, no. 1 (December 18, 2019): 223–24. http://dx.doi.org/10.1515/ncrs-2019-0591.

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AbstractC21H25N9O4, monoclinic, P2/n (no. 13), a = 10.277(3) Å, b = 10.081(3) Å, c = 11.264(4) Å, β = 104.582(4)°, V = 1129.4(6) Å3, Z = 2, Rgt(F) = 0.0452, wRref(F2) = 0.1278, T = 296(2) K [1], [2], [3].

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Wu, Hao, and Wei-Na Wu. "Crystal structure of bis(1-(phenylsulfonyl)-2-(1-(pyrazin-2-yl)ethylidene)hydrazin-1-ido-κ3N,N′,O)nickel(II), C24H22N8O4S2Ni." Zeitschrift für Kristallographie - New Crystal Structures 233, no. 3 (May 24, 2018): 465–66. http://dx.doi.org/10.1515/ncrs-2017-0356.

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34

Wang, Wan-Wan, Wei-Na Wu, and Yuan Wang. "Crystal Structure of bis(1-(phenylsulfonyl)-2-(1-(pyrazin-2-yl)ethylidene)hydrazin-1-ido-κ3N,N′,O)copper(II), C24H22N8O4S2Cu." Zeitschrift für Kristallographie - New Crystal Structures 233, no. 3 (May 24, 2018): 467–68. http://dx.doi.org/10.1515/ncrs-2017-0357.

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35

Yan, Jin-Long. "Crystal structure of N-(amino(pyrazin-2-yl)methylene)-6-methylpyridin-1-ium-3-carbohydrazonate-κ3O,N,N′)-(dinitrato-κ1O)zinc(II), C12H12N8O7Zn." Zeitschrift für Kristallographie - New Crystal Structures 235, no. 2 (February 25, 2020): 283–84. http://dx.doi.org/10.1515/ncrs-2019-0605.

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36

Mao, Xianjie, Chuntong Li, Gaoyuan Xu, and Huijun Li. "Crystal structure of diaqua-(N-(1-(pyrazin-2-yl)ethylidene)nicotinohydrazonato-κ3N,N′,O)-bis(nitrato-κ2O,O′)samarium(III), C12H14N7O9Sm." Zeitschrift für Kristallographie - New Crystal Structures 233, no. 5 (August 28, 2018): 801–2. http://dx.doi.org/10.1515/ncrs-2017-0434.

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37

Yaling, He, Zeng Shilin, Zhang Peiling, and Xu Zhouqing. "Crystal structure of diaqua-dinitrato-k2O,O′((Z)-N-((E)-1-(pyrazin-2-yl)ethylidene)nicotinohydrazonato-k3N,N′,O)europium(II), C12H14N7O9Eu." Zeitschrift für Kristallographie - New Crystal Structures 233, no. 4 (July 26, 2018): 671–72. http://dx.doi.org/10.1515/ncrs-2017-0433.

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38

Wang, Yu-Fang, and Yong-Hua Zhang. "Crystal structure of catena-poly[(μ2-isophthalato-κ2O:O′)-(2,5-di(pyrazin-2-yl)-4,4′-bipyridine-κ3N,N′,N′′)zinc(II)] — water (2/5), C26H21N6O6.5Zn." Zeitschrift für Kristallographie - New Crystal Structures 234, no. 5 (September 25, 2019): 1043–45. http://dx.doi.org/10.1515/ncrs-2019-0250.

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AbstractC26H21N6O6.5Zn, monoclinic, C2/c (no. 15), a = 18.3123(3) Å, b = 8.97463(15) Å, c = 30.1437(5) Å, β = 99.5396(16)°, V = 4885.51(14) Å3, Z = 4, Rgt(F) = 0.0352, wRref(F2) = 0.0746, T = 293(2) K.

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39

Jinli, Liu, and Zhang Peiling. "Crystal structure of diaqua-(N-(1-(pyrazin-2-yl)ethylidene)pyridin-1-ium-4-carbohydrazonate-κ3N,N′,O)-tris[nitrato-κ2O,O′)lanthanum(III), C12H15N8O12La." Zeitschrift für Kristallographie - New Crystal Structures 233, no. 6 (November 27, 2018): 1011–12. http://dx.doi.org/10.1515/ncrs-2018-0134.

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40

Cao, Xin, Jianhua Sun, Weihua Li, and Hui Lu. "Crystal structure of dinuclear dichloridobis(dimethylformamide-kO)bis[μ2-3-(2-oxyphenyl)-5-(pyrazin-2-yl)-1,2,4-triazol-1ido-κ4-O,N:N′,N′′(2−)]diiron(III) − dimethylformamide (1/1), C36H42Cl2Fe2N14O6." Zeitschrift für Kristallographie - New Crystal Structures 232, no. 1 (January 1, 2017): 85–86. http://dx.doi.org/10.1515/ncrs-2016-0161.

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41

Bock, Hans, Holger Schödel, and Thorsten Vaupel. "Wechselwirkungen in Kristallen, 112 [1]. Tetra(2-pyridyl)pyrazin - ein vielseitiger Ligand für Lewis-Säuren: Halb- und doppelschalige Komplexe von Kupfer(II)- und Nickel(II)-Salzen / Interactions in Crystals, 112 [1]. Tetra(2-pyridyl)pyrazine - a Versatile Ligand for Lewis Acids: Semi- and Doubly-Encapsulated Complexes of Copper(II) and Nickel(II) Salts." Zeitschrift für Naturforschung B 52, no. 4 (April 1, 1997): 515–23. http://dx.doi.org/10.1515/znb-1997-0413.

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Preceding cyclovoltammetric measurements of tetra(2-pyridyl)pyrazine (TPP) in aprotic THF solution and the lowering of the reduction potential on Li+[B(C6H5)4 ] addition, the crystallization of diprotonated [TPPH2++][B(CAH5)4-]2 and of [2,4,6-tris(2-pyridyl)-1,3,5- triazine(Li+)][B(C6H5)4-] have stimulated the preparation and structural characterization of the following (TPP)1,2 copper(II) and (TPP)2 nickel(II) salts: (1) Green TTP-copper(II)- dichlorideacetonitrile with Cu2+ fivefold coordinated by three N contacts to one TPP ligand and by two Cl anions, (2) green di(TPP)-copper(II)-di(perchlorate)·2 acetonitrile with fully encapsulated Cu2+ coordinated to six N centers of two TPP ligands, and (3) the analogous nickel(II) complex, brown di(TPP)-nickel(II)-bis-(tetrafluoroborat)·3 water-methanol. Both complexes [(TPP)Me2+(TPP)](X-)2 with the Me2+ dications in the cavity provided by two twisted TPP ligands are reported for the first time. The discussion of the crystal structures is based on an extensive search in the Cambridge Structural Database, which confirms the distortion mode around the penta-coordinated Cu2+ center, and a more strongly distorted octahedron at the Cu2+ center relative to that at the six-coordinate Ni2+ center as well as shorter contacts Me2+ ··· N to the pyrazine N centers than to the pyridine N centers. The comparison of the monodentate terpyridyl ligand with the bidentate tetra(2-pyridyl)pyrazine suggests the preparation of Me+n-bridged polymer chains terminated by terpyridyl complexation.

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Wang, Zhaodong, and Haitao Ni. "Methyl 4-{N′-[(1E)-1-(pyrazin-2-yl)ethylidene]hydrazinecarbonyl}benzoate." IUCrData 3, no. 9 (September 7, 2018). http://dx.doi.org/10.1107/s2414314618012300.

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The title Schiff base, C15H14N4O3, was synthesized by the condensation reaction between caprylic hydrazide and 2-acetylpyrazine. There are two independent pseudo-enantiomeric molecules, A and B, in the asymmetric unit that differ mainly in the orientation of the hydrazone units. For example, the dihedral angles between the benzene and pyrazine rings are 20.836 (13) (A) and 15.701 (14)° (B). The molecular packing features N—H...O hydrogen bonds that lead to a twisted supramolecular chain along the b-axis direction. The presence of C—H...O interactions consolidates the chains into a three-dimensional architecture. The studied sample was a two-component twin.

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43

Yu-Fang, Wang, and Shu-Qi Zhang. "Crystal structure of the nickel(II) complex aqua-(2,6-di(pyrazin-2-yl)-4,4′-bipyridine-κ3 N,N′,N′′)-(phthalato-κ2 O,O′)nickel(II) tetrahydrate, C26H26N6O9Ni." Zeitschrift für Kristallographie - New Crystal Structures, July 28, 2021. http://dx.doi.org/10.1515/ncrs-2021-0141.

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Abstract C26H26N6O9Ni, triclinic, P 1 ‾ $‾{1}$ (no. 2), a = 11.2329(5) Å, b = 11.7535(5) Å, c = 12.1109(7) Å, α = 70.936(5)°, β = 75.684(4)°, γ = 63.266(4)°, V = 1340.13(13) Å3, Z = 2, R gt (F) = 0.0314, wR ref (F 2) = 0.0743, T = 290 K.

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