H-bonded effects on supramolecular liquid crystalline trimers containing photoluminescent cores

Hong-Cheu Lin, Hong Cheu Lin, Hong Cheu Lin, Hsin Yi Sheu, Chiou Ling Chang, Chiitang Tsai

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Several series of hydrogen-bonded (H-bonded) liquid crystalline trimers are constructed by complexation of two complementary components containing various bifunctional photoluminescent (PL) acceptor cores and monofunctional proton donors (in a 1:2 molar ratio). These supramolecular liquid crystalline trimers (i.e. H-bonded trimers 1/3, 1/4, 1/5, 1/6, 2/3, 2/4, 2/5 and 2/6) are, respectively, obtained from bifunctional bis-pyridyl acceptors (containing conjugated benzene and thiophene centers) (1 and 2) complexed with monofunctional carboxylic acids (containing benzene, thiophene or naphthalene) (3-6) in a 1:2 acceptor-donor group stoichiometry. Though the PL bis-pyridyl acceptors (1 and 2) do not possess any mesophases, the distinct mesomorphism and supramolecular architecture of these H-bonded trimers are confirmed by polarizing optical microscopy (POM), DSC, and powder X-ray diffraction (XRD) experiments. Moreover, the PL properties of the photoluminescent bis-pyridyl cores can be adjusted not only by the central structures of the cores but also by their surrounding non-photoluminescent proton donors. In general, redder shifts occur in PL spectra of H-bonded trimers when proton donors of smaller pKa values are H-bonded to the photoluminescent cores. Significantly, different wavelengths and polarized light of PL emission can be obtained in these supramolecular structures possessing both liquid crstalline and photoluminescent properties.

Original languageEnglish
Pages (from-to)2958-2965
Number of pages8
JournalJournal of Materials Chemistry
Issue number12
StatePublished - 1 Jan 2001

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