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Cyclotriphosphazene as a dendritic core for the preparation of columnar supermolecular liquid crystals

AuthorsBarberá, Joaquín; Jiménez, Josefina ; Laguna, Antonio ; Oriol, Luis; Pérez, Sonia; Serrano, José Luis
Issue Date20-Oct-2006
PublisherAmerican Chemical Society
CitationChemistry of Materials 18(23): 5437–5445 (2006)
AbstractA 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.
Description9 pages, 8 figures, 2 tables.
Publisher version (URL)http://dx.doi.org/10.1021/cm061147d
Appears in Collections:(ICMA) Artículos
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