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Contribution of proton NMR relaxation to the investigation of molecular dynamics in columnar mesophases of discotic and polycatenar molecules

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Abstract

We present in this work a review concerning wide frequency rangeT 1 proton NMR relaxation studies performed in compounds exhibiting columnar mesophases, namely the Colho mesophase in the case of a liquid crystal of discotic molecules and the øh mesophase in the case of a liquid crystal of biforked molecules. These NMR relaxation studies were performed combining conventional and fast field cycling NMR techniques in a frequency range between 100 Hz and 300 MHz. The possibility of probing such a large frequency range has provided a way to effectively distinguish the influence, on theT 1 relaxation profiles, of the different molecular movements observed in this type of mesophases. In addition, we present a comparison between the molecular dynamics in columnar (øh) and lamellar (SmC) mesophases exhibited by the same biforked compound.

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Authors and Affiliations

  1. Centra de Fisica da Materia Condensada (UL), Av. Prof. Gama Pinto 2, 1699 Lisboa Cedex, Portugal IST (UTL), Av. Rovisco Pais, 1049-001, Lisboa, Portugal

    A. C. Ribeiro, P. J. Sebastiao & C. Cruz

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  1. A. C. Ribeiro
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  2. P. J. Sebastiao
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  3. C. Cruz
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Ribeiro, A.C., Sebastiao, P.J. & Cruz, C. Contribution of proton NMR relaxation to the investigation of molecular dynamics in columnar mesophases of discotic and polycatenar molecules. Pramana - J Phys 61, 205–218 (2003). https://doi.org/10.1007/BF02708303

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