Investigation of the mechanism of orientation in lyotropic liquid crystalline phases

如果溶质被放置在各向异性的环境中-在这种情况下，液晶或聚合物凝胶-它们相对于磁场定向。这使得各向异性核磁共振参数，如偶极耦合，直接观察。因此，液晶可以被理解为一种特殊而复杂的限制。为了描述化合物在定向介质中的取向，使用模型，其通常仅包含空间位势或静电势，而不考虑各向异性介质在原子细节上的结构。氢键（H-键）也没有考虑到目前为止。本项目的目的是获得有关液晶介质中溶解化合物相互作用的信息。因此，我们希望研究通过氢键具有不同程度的分子内稳定性的液晶。重点讨论了氢键对液晶稳定性和聚集行为的重要性以及氢键对溶解态化合物取向性质的影响。因此，应使用可形成氢键或不能形成氢键的溶质。因此，我们的目标是更好地理解在取向过程中的氢键的重要性，以获得更好的液晶溶质相互作用模型。

If solutes are placed in an anisotropic environment - as in this case a liquid crystal or polymer gel ¿ they are oriented with respect to the magnetic field. This makes anisotropic nmr parameters, such as the dipolar coupling, directly observable. The liquid crystal can thus be understood as a special and complex kind of confinement. To describe the orientation of compounds in orienting media models are used, which frequently only contain steric or electrostatic potentials without taking the structure of the anisotropic medium in atomic detail into account. Hydrogen bonds (H-bonds) also have not been taken into account so far. The aim of this project is to obtain information on the interaction of dissolved compounds in liquid crystalline media. Thus we want to investigate liquid crystals with different degrees of intramolecular stabilization via H-bonds. The emphasis shall we laid on the importance of H-bonds for stability and aggregation behavior of the liquid crystal as well as on their influence on the orientational properties of the dissolved compound. Thus solutes shall be used which can either form H-bonds or cannot form H-bonds. Thus we aim at a better understanding on the importance of H-bonds in the orientational process in order to obtain better models for liquid crystal solute interactinos.