Journal
CHEMISTRY OF MATERIALS
Volume 18, Issue 23, Pages 5437-5445Publisher
AMER CHEMICAL SOC
DOI: 10.1021/cm061147d
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A series of supermolecular liquid crystals has been synthesized by combining a cyclotriphosphazene unit as a dendritic core and polycatenar mesogenic units. Microsegregation of the alkyl chains and the aromatic central cores together with space-filling properties make these cyclophosphazenes adopt a discotic conformation and are assembled in a columnar mesophase. Furthermore, IR spectra taken over a range of temperatures provide evidence that the discotic structure and columnar assembly are highly stabilized by H-bonding. The columnar mesophase can be maintained or vitrified at room temperature depending on the length of the terminal alkyl chains. Structural characterization of these assemblies has been carried out by X-ray diffraction. Helical ordering has been detected in oriented samples of these materials.
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