Die Feinstruktur der magnetischen Protonenresonanz in kristallin‐flüssigem p‐Azoxyanisol

Abstract

Mit 8 Abbildungen InhaltsiibersichtDie Analyse des aus drei Linienkomponenten bestehenden Protonenresonanzabsorptionssignals aus der nematischen Phase des p-Azoxyanisols wird eingehend behandelt. Einen maagebenden EinfluB iibt die Beweglichkeit der Einzelmolekule sowie die der Methylprotonen auf die die Linienform und das mittlere zweite Moment bestimmenden kernmagnetischen Dipolwechselwirkungen aus. Der Ordnungsgrad und der mittlere Schwankungswinkel der Molekiilliingsachsen sowie der Sauerstoffvalenzu-inkel der Methoxygruppe werden aus den experimentellen Daten berechnet , die Ergebnisse werden diskutiert.

Ordering and intramolecular mobility in the nematic phase of PAA investigated by means of NMR lineshape analysis and computer simulations of the lineshape

“…We think this motion to be some kind of (hindered ?) rotation of the CH3-group as a whole about the 0-Cring bond what has already been assumed formerly in interpreting NMR experiments [23]. The same type of motion has also been applied to explain the NMR relaxation data of PAA even in its solid phase by Thompson et al [28].…”

On Measuring Nuclear Magnetic Shielding Anisotropies in Liquid Crystal Solvents

“…Although this method may be useful in special cases [11], it is known that chemical shifts are also temperature dependent [12]; see Tables 1 and 2. A more general approach is to spin the nematic solution about an axis perpendicular to the direction of the external field [13]. Spinning will result in a frictional torque on the solvent molecules that rotates the optic axis about the molecular center of mass in the direction of spinning.…”

Reflective display device based on electrowetting

“…where d and G, refer to the thickness and the dielectric permittivity of the hydrophobic insulating coating on the electrode [8].…”