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Molecular conductors as nanoparticles in the presence of long-chain alkyl imidazolium salts or amphiphilic molecules

Synthesis and thermoanalytical studies

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Abstract

Nanoparticles of two molecule-based conductors, namely TTF·TCNQ and TTF[Ni(dmit)2]2, have been prepared in organic solution in the presence of ionic or nonionic species bearing a long-chain alkyl group, acting as growth-controlling agents. The size, morphology, and state of dispersion of the nanoparticles depended on the nature of the growth-controlling agent and the reaction temperature. In the presence of a long-chain alkyl-based ionic liquid at −50 °C, electron micrographs evidence that TTF·TCNQ nano-objects are frequently elongated, whereas TTF[Ni(dmit)2]2 nanoparticles are aggregated. In the presence of a neutral long-chain alkyl-based imine at room temperature, nanoparticles are spherical (mean diameter <20 nm) and well dispersed. Vibration spectra evidence that the amounts of charge transfer for TTF·TCNQ and TTF[Ni(dmit)2]2 as nano-objects are very similar to those for the same phases as bulk materials. According to the thermoanalytical investigations, the prepared nanoparticles are stable thermally up to approximately 200 °C, and their decomposition is generally a multi-step process. Their heat treatment results in various sulfur-containing volatiles (CS2, SO2, H2S); moreover, HCN is also detected in the case of nitrogen-containing molecules (TCNQ).

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Acknowledgements

The authors would like to thank CNRST-Morocco for a grant (S. F.) and Ministère de l’Enseignement Supérieur et de la Recherche-France for a grant (I. C.). We would also like to thank CNRS-Toulouse and Université Paul Sabatier-Toulouse.

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Authors and Affiliations

  1. Laboratoire S3ME, Faculté des Sciences, Mohammed V University in Rabat, Av Ibn battouta, Agdal, BP1014, Rabat, Morocco

    Soukaina Foulal & Souad El Hajjaji

  2. Functional Interfaces Research Group, Institute of Materials and Environmental Chemistry, Research Centre for Natural Sciences, Hungarian Academy of Sciences, Magyar Tudósok körútja, 2, Budapest, 1117, Hungary

    Laszlo Trif

  3. Equipe Matériaux, Nanomatériaux, Faculté des Sciences, Université Med V, Av Ibn battouta, Agdal, BP1014, Rabat, Morocco

    Abdelaziz Sabbar

  4. LCC (Laboratoire de Chimie de Coordination), CNRS, 205 route de Narbonne, BP 44099, 31077, Toulouse Cedex 4, France

    Imane Chtioui, Dominique De Caro & Christophe Faulmann

  5. UPS, INPT, Université de Toulouse, 31077, Toulouse Cedex 4, France

    Imane Chtioui, Dominique De Caro & Christophe Faulmann

  6. INPT-ENSIACET, LCA (Laboratoire de Chimie Agro-Industrielle), Université de Toulouse, 4 allée Emile Monso, 31030, Toulouse, France

    Pascale De Caro

  7. UMR 1010 CAI, INRA, 31030, Toulouse, France

    Pascale De Caro

Authors
  1. Soukaina Foulal
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  2. Souad El Hajjaji
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  3. Laszlo Trif
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  4. Abdelaziz Sabbar
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  5. Imane Chtioui
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  6. Dominique De Caro
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  7. Christophe Faulmann
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  8. Pascale De Caro
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Correspondence to Souad El Hajjaji.

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Foulal, S., El Hajjaji, S., Trif, L. et al. Molecular conductors as nanoparticles in the presence of long-chain alkyl imidazolium salts or amphiphilic molecules. J Therm Anal Calorim 127, 1879–1888 (2017). https://doi.org/10.1007/s10973-016-5858-z

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  • DOI: https://doi.org/10.1007/s10973-016-5858-z

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