Carbon-13 NMR measurements of the chemical shifts are reported as a function of temperature for a semi-phasmidic molecule 4-(2,3,4-tridecyloxy-phenylazo)-benzoic acid (TDPABA). The data indicate a dimer structure in the solution and suggest a similar structure also in the nematic phase, which is con- sistent with it being a phasmid-like liquid crystal. The orientational order parameters are derived in the nematic phase based on the carbon shielding tensors calculated by Density Functional Theory. The nema- tic order parameter Szz is found to be (relatively) higher for TDPABA than that found in a typical calamitic liquid crystal, likely due to its underlying columnar phase.
|Autori:||Marini A; Geppi M; Prasad V; Dong RY|
|Titolo:||NMR study of a phasmid-like liquid crystal|
|Anno del prodotto:||2011|
|Digital Object Identifier (DOI):||10.1016/j.cplett.2011.03.072|
|Appare nelle tipologie:||1.1 Articolo in rivista|