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Solid-liquid equilibrium and heat capacity trend in the alkylimidazolium PF6 series

The result's identifiers

  • Result code in IS VaVaI

    <a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F60461373%3A22340%2F17%3A43914614" target="_blank" >RIV/60461373:22340/17:43914614 - isvavai.cz</a>

  • Result on the web

    <a href="https://www.sciencedirect.com/science/article/pii/S0167732217300582" target="_blank" >https://www.sciencedirect.com/science/article/pii/S0167732217300582</a>

  • DOI - Digital Object Identifier

    <a href="http://dx.doi.org/10.1016/j.molliq.2017.10.042" target="_blank" >10.1016/j.molliq.2017.10.042</a>

Alternative languages

  • Result language

    angličtina

  • Original language name

    Solid-liquid equilibrium and heat capacity trend in the alkylimidazolium PF6 series

  • Original language description

    The heat capacity and thermal behavior trend along the 1-alkyl-3-methylimidazolium hexafluorophosphate [CnC1im][PF6] (with n = 2?10, 12) ionic liquids series, is used to explore the effect of the alkyl chain length in the nanostructuration. The heat capacities of the studied ILs were measured with an uncertainty better than ?0.15% and are in excellent agreement with the available data in the literature. An odd-even effect for the specific and volumic heat capacities of the [CnC1im][PF6] series was found. The observed odd-even effect in the liquid heat capacity was rationalized considering the preferential orientation of the terminal -CH3 group. The higher specific/volumic heat capacities shown for the [C6C1im][PF6] and [C8C1im][PF6] are an indication of an additional conformational disorder increase in the liquid phase that could be related with a weaker alkyl chain interdigitation capability of the even number chain ILs. The melting temperature and consequent enthalpy and and entropy of fusion trend along the alkyl series present a V-shape profile that is explained based on the analysis of the balance between the initial decrease of the electrostatic interaction potential and the increase of the van der Waals interactions with the increasing size of the alkyl side chain of the cation. The inhibition of crystallization for intermediate alkyl chain size (from [C5C1im][PF6] to [C8C1im][PF6]) seems to arise from the overlapping of the hypothetical cold crystallization temperature by the melting temperature. Above the critical alkyl size, CAS, a regular increase in the entropy and enthalpy profiles presents a similar shape than the observed in other alkane series and is a strong support of the intensification of the ILs nanostructuration.

  • Czech name

  • Czech description

Classification

  • Type

    J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database

  • CEP classification

  • OECD FORD branch

    10403 - Physical chemistry

Result continuities

  • Project

  • Continuities

    S - Specificky vyzkum na vysokych skolach<br>I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Others

  • Publication year

    2017

  • 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 Liquids

  • ISSN

    0167-7322

  • e-ISSN

  • Volume of the periodical

    248

  • Issue of the periodical within the volume

    14. říjen 2017

  • Country of publishing house

    NL - THE KINGDOM OF THE NETHERLANDS

  • Number of pages

    10

  • Pages from-to

    "678?687"

  • UT code for WoS article

    000418314400082

  • EID of the result in the Scopus database

    2-s2.0-85032347291