Measurement and Analysis of the Molecular Ordering Tensors of Two Enantiomers Oriented in a Polypeptide Liquid Crystalline System

Multinuclear NMR in polypeptide liquid crystals: Three fertile decades of methodological developments and analytical challenges

“…This has led to the first numerical quantification of the difference in orientation through the Euler angles. Such a quantification was first exemplified in the case of 3-hydroxy-4,4,4-trichlorobutyric β-lactone [49], and then followed by the study on the (±)-3-butyn-2-ol, both dissolved in a PBLG mesophase [190] (see Fig. 19).…”

“…The determination of five non-zero order parameters of the Saupe order matrix (see Section 2) for each C 1 -symmetry enantiomer in a mixture requires a coherent set of spectral data with at least six homoand/or heteronuclear RDCs [49,190].…”

“…) and inertia tensors (I), or analyzing two orienting (chiral or achiral) media. It provides an alternative to the Euler angles, , used initially to compare the relative orientation of PAS R and PAS S in 90's [49,190]. From a more theoretical viewpoint, the analysis of the inter-tensor angles between enantiomers in CLC or between CLC and ALC provides valuable insights for understanding the global alignment process and the parameters governing enantiodiscrimination mechanisms such as the molecular shape anisotropy or electronic effects.…”

Spin–spin coupling edition in chiral liquid crystal NMR solvent

“…The magnitudes of these partially-averaged interactions depend on the orientational order of the molecules in the liquid crystalline phase [18]. Furthermore, in a chiral anisotropic solvent, enantiomers do not have the same orientational order [19,20]. Consequently, all the order-dependent NMR interactions, namely the chemical shift anisotropy, the residual dipolar coupling or the quadrupolar splitting, will be different for each isomer.…”

Two-Dimensional NMR Study of a Liquid-Crystal Solution under Magic-Angle Spinning. Conformation of Carboxylic Ionophore Lasalocid A Dissolved in a Lyotropic Liquid Crystal

“…FurtherThe molecular structures in liquid crystals are of interest more, the unfavorable effect of spin diffusion is reduced in because oriented states of molecules are similar to those the ROESY experiment. Hence, ROESY combined with the in biological membranes ( 1 ) . In this sense the liquid crys-MAS technique (ROESY/MAS) will be very useful for contal can offer an environment to discuss properly biomem-formational studies in liquid crystals.…”