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Gao LL, Huang SX, Wu WN. Crystal structure of 3-aminopyrazine-2-carbohydrazide, C 5H 7N 5O. Z KRIST-NEW CRYST ST 2019. [DOI: 10.1515/ncrs-2018-0278] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
Abstract
C6H8N4O, monoclinic, P21/c (no. 14), a = 10.1022(8) Å, b = 9.4818(8) Å, c = 7.0832(6) Å, β = 94.1380(10)°, V = 676.71(10) Å3, Z = 4, R
gt(F) = 0.0357, wR
ref(F
2) = 0.1088, T = 296(2) K.
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Affiliation(s)
- Liang-Liang Gao
- College of Chemistry and Chemical Engineering , Henan Polytechnic University , Jiaozuo, 454000 , P.R. China
| | - Shan-Xiu Huang
- College of Chemistry and Chemical Engineering , Henan Polytechnic University , Jiaozuo, 454000 , P.R. China
| | - Wei-Na Wu
- College of Chemistry and Chemical Engineering , Henan Polytechnic University , Jiaozuo, 454000 , P.R. China
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Ahmad M, Perveen Z, Bortoluzzi AJ, Hameed S, Shah MR, Tariq M, Din GU, Jan MT, Siddique M, Anwar M. Synthesis and characterization of novel iminobenzoates with terminal pyrazine moieties. Chem Cent J 2018; 12:25. [PMID: 29516202 PMCID: PMC5842172 DOI: 10.1186/s13065-018-0396-3] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/10/2017] [Accepted: 02/28/2018] [Indexed: 11/10/2022] Open
Abstract
Apart from its numerous biological activities like antidiabetic, anti-inflammatory, antimicrobial, pyrazine moiety plays an important role in luminescent materials. Its role in luminescent materials is due to its highly electron deficient nature specially when it is in the centre along the mainstay of extended π-conjugated systems. Similarly, new liquid crystalline compounds are being made constantly where the central benzoaromatic moiety is being replaced with the heterocycles including pyrazine due to their more variable nature. Pyrazine derivatives can also be used in supramolecular assemblies due to their efficient hydrogen bonding, protonation and complexation properties. Keeping in view the enormous applications of pyrazine derivatives we planned to synthesize new extended iminobenzoates with pyrazine moieties at the terminal positions. The planned iminobenzoates with terminal pyrazine moieties were prepared following standard procedures. The pyrazine-2-carbohydrazide (1) and 5-methylpyrazine-2-carbohydrazide (2) were prepared by refluxing their methyl esters with hydrazine hydrate in methanol. The esters (3a-3f) were synthesized by reacting 4-hydroxybenzaldehyde with differently substituted acid halides in tetrahydrofuran in the presence of triethyl amine. The target compounds that is, iminobenzoates with the pyrazine moieties at terminal positions (4a-4l), were obtained in good to excellent yields by the reaction of the hydrazides with the esters at reflux. The synthesized compounds were fully characterized using different spectroanalytical techniques including FT-IR, NMR, Mass, elemental analysis and single crystal X-ray diffraction analysis. The paper describes the synthesis of novel iminobenzoates following easy methods while utilizing commercially available starting materials. The synthesized iminobenzoates may possibly be converted to compounds with luminescent and liquid crystalline properties after making suitable changes to the pyrazine moieties. Properly substituted pyrazines on both sides, capable of further suitable extensions, may result in compounds with such properties.
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Affiliation(s)
- Mushtaq Ahmad
- Medicinal Botanic Centre PCSIR Labs Complex, University Road, Peshawar, 25120 Pakistan
| | - Zahida Perveen
- Institute of Chemical Sciences, University of Peshawar, Peshawar, 25120 Pakistan
| | - Adailton J. Bortoluzzi
- Departmento de Química, Universidade Federal de Santa Catarina, Florianópolis, SC 88040-900 Brazil
| | - Shahid Hameed
- Deparment of Chemistry, Quaid-I-Azam University, Islamabad, 45320 Pakistan
| | - Muhammad R. Shah
- HEJ Research Institute of Chemistry University of Karachi, Karachi, 75270 Pakistan
| | - Muhammad Tariq
- Department of Chemistry, Shaheed Benazir University, Sheringal, Upper Dir, 18050 KPK Pakistan
| | - Ghias ud Din
- Institute of Chemical Sciences, University of Peshawar, Peshawar, 25120 Pakistan
| | - Muhammad T. Jan
- Department of Chemistry, Islamia College University, Peshawar, 25120 Pakistan
| | - Muhammad Siddique
- Medicinal Botanic Centre PCSIR Labs Complex, University Road, Peshawar, 25120 Pakistan
| | - Muhammad Anwar
- Medicinal Botanic Centre PCSIR Labs Complex, University Road, Peshawar, 25120 Pakistan
- Present Address: Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, 155 Yangqiao Road West, Fuzhou, 350002 China
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Hameed S, Ahmad M, Tahir MN, Israr M, Anwar M. N'-[(E)-1-(2-Hy-droxy-phen-yl)ethyl-idene]pyrazine-2-carbohydrazide. Acta Crystallogr Sect E Struct Rep Online 2014; 69:o1419. [PMID: 24427054 PMCID: PMC3884444 DOI: 10.1107/s1600536813022137] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/07/2013] [Accepted: 08/07/2013] [Indexed: 12/02/2022]
Abstract
The title compound, C13H12N4O2, crystallized with two independent molecules (A and B) in the asymmetric unit. Molecule B is planar to within 0.044 (3) Å for all non-H atoms, while molecule A is slightly twisted, with a dihedral angle of 6.29 (4)° between the mean planes of the pyrazine-2-carbohydrazide and 1-(2-hydroxyphenyl)ethanone moieties (r.m.s. deviations = 0.0348 and 0.0428 Å, respectively). S(5) and S(6) ring motifs are formed in both molecules due to the presence of intramolecular O—H⋯N and N—H⋯N hydrogen bonds. In the crystal, molecules A and B are linked by a C—H⋯O hydrogen bond. They stack along the a-axis direction, forming columns with π–π interactions involving inversion-related pyrazine and benzene rings [centroid–centroid distances = 3.5489 (13)–3.8513 (16) Å].
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Affiliation(s)
- Shahid Hameed
- Department of Chemistry, Quaid-i-Azam University, Islamabad, Pakistan
| | - Mushtaq Ahmad
- Department of Chemistry, Quaid-i-Azam University, Islamabad, Pakistan ; Medicinal Botanic Centre, PCSIR Laboratories Complex, Peshawar, Pakistan
| | - M Nawaz Tahir
- University of Sargodha, Department of Physics, Sargodha, Pakistan
| | - Muhammad Israr
- Department of Chemistry, Kohat University of Science and Technology, Kohat, Pakistan
| | - Muhammad Anwar
- Department of Chemistry, Kohat University of Science and Technology, Kohat, Pakistan
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