Abstract
Abstract A shape-persistent macrocycle composed of carbazole and salphen, which has a discrete 1.4-nm-sized inner cavity, forms four thermotropic columnar liquid crystalline (LC) phases. Both the structure and dynamics of the macrocyclic mesogens in the LC phases were investigated by solid-state NMR. Variable temperature 1H and 13C magic-angle spinning (MAS) experiments reveal that the peripheral side chains exhibited narrow line widths throughout the columnar phases, indicating that the side chains behave like liquids among the columns. In sharp contrast, the NMR signals related to the macrocyclic mesogen became highly symmetric and similar to signals in solution with increasing temperature. These results revealed that the LC macrocycle with an inherent inner cavity gains more mobility around the mesogenic framework as the macrocycle underwent phase transitions.
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