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Isomers and conformers of two push-pull hydrazines studied by NMR and vibrational spectroscopy and by ab initio calculations

The result's identifiers

  • Result code in IS VaVaI

    <a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F60461373%3A22340%2F07%3A00019344" target="_blank" >RIV/60461373:22340/07:00019344 - isvavai.cz</a>

  • Result on the web

  • DOI - Digital Object Identifier

Alternative languages

  • Result language

    angličtina

  • Original language name

    Isomers and conformers of two push-pull hydrazines studied by NMR and vibrational spectroscopy and by ab initio calculations

  • Original language description

    The isomers and conformers of two push-pull hydrazines: 3-N,N-dimethylhydrazino-2-acetyl propenenitrile [(H3C)(2)N-NH-CH= C(CN)(COCH3)] (DMHAP) and 3-N,N-dimethylhydrazino-2-methylsulfonyl propenenitrile [(H3C)(2)N-NH-CH=C(CN)(SO2CH3)] (DMHSP) have beenstudied experimentally by NMR and vibrational spectroscopy and theoretically by the ab initio calculations at MP2 level in 6-31G** basis set. The IR and Raman spectra of both compounds as a solid and solute in various solvents have been recorded. The NMRspectra were obtained in chloroform and DMSO at room temperature. Both compounds have been prepared by the same way. NMR spectra revealed that DMHAP was prepared as a pure Z-isomer whereas in the case of DMHSP a pure E-isomer was obtained. Due to the low barrier for both compounds practically free isomerisation process occurred in the solutions but in opposite directions. Whereas DMHAP exists in the solid state and in the less polar solvent as Z-isomer, in more polar solvents the appear

  • Czech name

    Isomery a konformery dvou "push-pull" hydrazinů studované pomocí NMR a vibrační spektroskopie a ab-initio výpočtů

  • Czech description

    Isomery a konformery dvou "push-pull" hydrazinů: 3-N,N-dimethylhydrazino-2-acetyl propenenitril [(H3C)(2)N-NH-CH= C(CN)(COCH3)] (DMHAP) a 3-N,N-dimethylhydrazino-2-methylsulfonyl propenenitril [(H3C)(2)N-NH-CH=C(CN)(SO2CH3)] (DMHSP) byly experimentálně studovány pomocí NMR a vibrační spektroskopie a teoreticky pomocí ab initio výpočtů na MP2 úrovni s 6-31G** bázovým setem. IR a Ramanova spektra obou sloučenin byla měřena jednak v pevném stavu, jednak pro různá rozpouštědla. NMR spektra byla získána proroztoky v chloroformu a DMSO při laboratorní teplotě. Obě sloučeniny byly přitom připraveny stejným postupem. NMR spektra odhalila, že DMHAP bylo připraveno jako čistý Z-isomer, zatímco v případě DMHSP se jedná o čistý E-isomer. Vzhledem k nízké bariéřepro obě sloučeniny objevuje se v roztoku prakticky volná isomerisace, ale uplatňuje se pro obě látky v opačném směru. Zatímco DMHAP je v pevném stavu a v méně polárních rozpouštědlech jako Z-isomer, ve více polárních rozpouštědlech lze po

Classification

  • Type

    J<sub>x</sub> - Unclassified - Peer-reviewed scientific article (Jimp, Jsc and Jost)

  • CEP classification

    CB - Analytical chemistry, separation

  • OECD FORD branch

Result continuities

  • Project

  • Continuities

    S - Specificky vyzkum na vysokych skolach

Others

  • Publication year

    2007

  • Confidentiality

    S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Data specific for result type

  • Name of the periodical

    Journal of Molecular Structure

  • ISSN

    0022-2860

  • e-ISSN

  • Volume of the periodical

    834-836

  • Issue of the periodical within the volume

    SI

  • Country of publishing house

    NL - THE KINGDOM OF THE NETHERLANDS

  • Number of pages

    9

  • Pages from-to

    284-293

  • UT code for WoS article

  • EID of the result in the Scopus database