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The Barrier to Internal Rotation and Electronic Effects in para-Halogenophenols: Theoretical Study

The result's identifiers

  • Result code in IS VaVaI

    <a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61388955%3A_____%2F04%3A00101128" target="_blank" >RIV/61388955:_____/04:00101128 - isvavai.cz</a>

  • Result on the web

  • DOI - Digital Object Identifier

Alternative languages

  • Result language

    angličtina

  • Original language name

    The Barrier to Internal Rotation and Electronic Effects in para-Halogenophenols: Theoretical Study

  • Original language description

    The OH rotational barrier height in phenol and para-halogenophenols systematically decreases in the series Br, Cl and F, while the changes in the CO bond length and CO bond strength do not follow this order. On the basis of the NBO analysis it is suggested that lowering of the barrier height in p-halogenophenols is caused by the decrease of electron density in the sigma antibonding orbital, sigma*(CO), and a weak occupancy of this orbital is due to the electron delocalization from the sigma(CC) ring orbitals. This effect can be either reinforced or reduced, depending on the extent of conjugation between the p(z)-type lone electron pair on the oxygen atom and the pi*(CC) acceptor orbitals in the aromatic ring.

  • Czech name

    Bariéra vnitřní rotace a elektronické efekty v para-halogenfenolech: teoretická studie

  • Czech description

    Výška rotační bariéry ve fenolu a v para-halogenfenolech systematicky klesá v řadě Br, Cl a F, kdežto změny v délce a síle vazby CO toto pořadí nesledují. Výsledky NBO analýzy nasvědčují, že snížení bariéry v p-halogenfenolech je způsobeno poklesem elektronové hustoty v .sigma.-antivazebném orbitalu, a jako slabé obsazení je důsledkem delokalizací elektronů ze .sigma.(CC) orbitalů kruhu. Tento efekt může být posílen nebo oslaben v závislosti na rozsahu konjugace mezi volným elektronovým párem typu pz nakyslíkovém atomu a .pi.* (CC) akceptorovými orbitaly aromatického kruhu.

Classification

  • Type

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

  • CEP classification

    CF - Physical chemistry and theoretical chemistry

  • OECD FORD branch

Result continuities

  • Project

    <a href="/en/project/LN00A032" target="_blank" >LN00A032: Structure and dynamics of complex molecular systems and biomolecules</a><br>

  • Continuities

    Z - Vyzkumny zamer (s odkazem do CEZ)

Others

  • Publication year

    2004

  • Confidentiality

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

Data specific for result type

  • Name of the periodical

    Chemical Physics Letters

  • ISSN

    0009-2614

  • e-ISSN

  • Volume of the periodical

    386

  • Issue of the periodical within the volume

    1/3

  • Country of publishing house

    NL - THE KINGDOM OF THE NETHERLANDS

  • Number of pages

    6

  • Pages from-to

    95-100

  • UT code for WoS article

  • EID of the result in the Scopus database