Author: Rostislav D. Lampeka

Cu(II), Ni(II) and Zn(II) mononuclear building blocks based on new polynucleating azomethine ligand : Synthesis and characterization

2017

Five new mononuclear complexes formed by the polynucleating ligand 2-[1-(3,5-dimethyl)pyrazolyl]-2-hydroxyimino-N′-[1-(2-pyridyl)ethylidene]acetohydrazide (HL): [Ni(L)(HL)]ClO4·2CH3OH (1), [Ni(L)2]·CH3OH (2), [Zn(L)(HL)]ClO4·2CH3OH (3), [Zn(L)2]·CH3OH (4) and [Cu(L)2]·CH3OH (5) were synthesized and characterized by elemental analysis, mass-spectrometry, IR-spectroscopy and X-ray analysis. The complexes reveal distorted octahedral N4O2 coordination arrangement formed by both protonated and deprotonated (1, 3) or two deprotonated ligand molecules (2, 4, 5). The presence of non-coordinated oxime and pyrazole groups resulted in the formation of extensive systems of hydrogen bonds in the crystal…

chemistry.chemical_classificationkemia010405 organic chemistryStereochemistryLigandHydrogen bondligandsProtonationliganditPyrazole010402 general chemistryOximechemistry01 natural sciencesMedicinal chemistry0104 chemical sciencesCoordination complexInorganic Chemistrychemistry.chemical_compoundDeprotonationchemistryMaterials ChemistryMoleculePhysical and Theoretical Chemistryta116

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A second monoclinic polymorph of 2-(3,5-dimethyl-1H-pyrazol-1-yl)-2-hy-droxy-imino-N'-[1-(pyridin-2-yl)ethyl-idene]acetohydrazide.

2013

The title compound, C14H16N6O2, is a second monoclinic polymorph of 2-[1-(3,5-dimethyl)pyrazolyl]-2-hydroxyimino-N′-[1-(2-pyridyl)ethylidene] acetohydrazide, with two crystallographically independent molecules per asymmetric unit. The non-planar molecules are chemically equal having similar geometric parameters. The previously reported polymorph [Plutenko et al. (2012 ▶). Acta Cryst. E68, o3281] was described in space group Cc (Z = 4). The oxime group and the O atom of the amide group are anti with respect to the C—C bond. In the crystal, molecules are connected by N—H⋯N hydrogen bonds into zigzag chains extending along the b axis.

Hydrogen bondGeneral ChemistryCondensed Matter PhysicsOximeBioinformaticsMedicinal chemistryOrganic Paperschemistry.chemical_compoundchemistryGroup (periodic table)AmideGeneral Materials Scienceta116Monoclinic crystal systemActa crystallographica. Section E, Structure reports online

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2-(3,5-Dimethyl-1H-pyrazol-1-yl)-2-hydroxyimino-N&#8242;-[1-(pyridin-2-yl)ethylidene]acetohydrazide

2012

In the title compound, C14H16N6O2, the dihedral angles formed by the mean plane of the acetohydrazide group [maximum deviation 0.0629&#8197;(12)&#8197;&#197;] with the pyrazole and pyridine rings are 81.62&#8197;(6) and 38.38&#8197;(4)&#176; respectively. In the crystal, molecules are connected by N&#8212;H...O and O&#8212;H...N hydrogen bonds into supramolecular chains extending parallel to the c-axis direction.

lcsh:Chemistrylcsh:QD1-999Acta Crystallographica Section E

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2-(3,5-Dimethyl-1H-pyrazol-1-yl)-2-hy-droxy-imino-N'-[1-(pyridin-2-yl)ethyl-idene]acetohydrazide.

2012

In the title compound, C14H16N6O2, the dihedral angles formed by the mean plane of the acetohydrazide group [maximum deviation 0.0629 (12) A] with the pyrazole and pyridine rings are 81.62 (6) and 38.38 (4)° respectively. In the crystal, molecules are connected by N—H⋯O and O—H⋯N hydrogen bonds into supramolecular chains extending parallel to the c-axis direction.

chemistry.chemical_compoundchemistryHydrogen bondMaximum deviationPyridineGeneral Materials ScienceGeneral ChemistryDihedral anglePyrazoleCondensed Matter PhysicsBioinformaticsMedicinal chemistryOrganic PapersActa crystallographica. Section E, Structure reports online

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Crystal structure of 2-hydroxyimino-2-(pyridin-2-yl)-N'-[1-(pyridin-2-yl)ethylidene]acetohydrazide

2014

The molecule of the title compound is approximately planar with the planes of the two pyridine rings inclined to one another by 5.51 (7)°. In the crystal, molecules are linked by bifurcated O—H⋯(O,N) hydrogen bonds, forming inversion dimers, which are in turn linked via C—H⋯O and C—H⋯N hydrogen bonds, forming sheets lying parallel to (502).

crystal structureacetohydrazidehydroxyiminoStackingpyridylethylideneCrystal structureRing (chemistry)Research CommunicationsCrystalchemistry.chemical_compoundAmideπ–π stacking interactionsPyridineGeneral Materials Scienceta116CrystallographyChemistryHydrogen bondGeneral ChemistryCondensed Matter PhysicsOximehydrogen bondingCrystallographyQD901-999π–π stacking interactionshydroxyiminopyridylethylideneActa Crystallographica Section E : Structure Reports Online

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2-(3,5-Dimethyl-1H-pyrazol-1-yl)-2-hydroxyimino-N0-[1-(pyridin-2-yl)ethylethylidene]

2012

In the title compound, C14H16N6O2, the dihedral angles formed by the mean plane of the acetohydrazide group [maximum deviation 0.0629 (12) A˚ ] with the pyrazole and pyridine rings are 81.62 (6) and 38.38 (4) respectively. In the crystal, molecules are connected by N—HO and O—HN hydrogen bonds into supramolecular chains extending parallel to the c-axis direction. peerReviewed

pyridine ringsacetohydrazide groupsingle-crystal X-ray studydihedral anglessupramolecular chains

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