Abstract
A detailed understanding of intermolecular interactions in liquid crystals at the atomistic level should enable us to understand how this delicate state of orientationally ordered, fluid matter manifests itself in such a wide variety of molecular structures. However, as emphasized in the preceding Chapter (Chapter 12), the information that can be extracted with nuclear magnetic resonance (NMR) is extremely limited: we are only able to take the most rudimentary steps towards characterizing the various types of contributions that comprise the liquid crystal’s mean field the anisotropic part of the motionally averaged intermolecular interactions that persist in fluids comprised of orientationally ordered molecules. In this Chapter we review approaches to this challenging problem in the physics of liquids by focusing on the way in which flexible solutes (probes that can access distinct conformations) are ordered in nematic liquid crystal solvents. This, in turn, can help characterize the anisotropic part of the intermolecular potential acting on each solute conformer. This potential is derived from the conformer’s interactions with the orientationally ordered solvent molecules and it is designated the potential of mnean torque, V(Ω).
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Samulski, E.T. (2003). Very Flexible Solutes: Alkyl Chains and Derivatives. In: Burnell, E.E., de Lange, C.A. (eds) NMR of Ordered Liquids. Springer, Dordrecht. https://doi.org/10.1007/978-94-017-0221-8_13
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DOI: https://doi.org/10.1007/978-94-017-0221-8_13
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