Multifunctional Supramolecular Dendrimers with an s‐Triazine Ring as the Central Core: Liquid Crystalline,Fluorescence and Photoconductive Properties |
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| Authors: | Madalina Buco? Dr Teresa Sierra Dr Attilio Golemme Dr Roberto Termine Dr Joaquín Barberá Dr Raquel Giménez Prof?Dr José Luis Serrano Dr Pilar Romero Dr Mercedes Marcos |
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| Affiliation: | 1. Departamento de Química Orgánica, Facultad de Ciencias‐Instituto de Ciencia de Materiales de Aragón, Universidad de Zaragoza‐CSIC, 50009 Zaragoza (Spain);2. LASCAMM CR‐INSTM, CNR‐IPCF UOS CS‐LiCryL, Dipartimento CTC. Università della Calabria, 87036 Rende (Italy);3. Departamento de Química Orgánica, Facultad de Ciencias‐Instituto de Nanociencia de Aragón, Universidad de Zaragoza, 50009 Zaragoza (Spain) |
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| Abstract: | Novel liquid crystal (LC) dendrimers have been synthesised by hydrogen bonding between an s‐triazine as the central core and three peripheral dendrons derived from bis(hydroxymethyl)propionic acid. Symmetric acid dendrons bearing achiral promesogenic units have been synthesised to obtain 3:1 complexes with triazine that exhibit LC properties. Asymmetric dendrons that combine the achiral promesogenic unit and an active moiety derived from coumarin or pyrene structures have been synthesised in order to obtain dendrimers with photophysical and electrochemical properties. The formation of the complexes was confirmed by IR and NMR spectroscopy data. The liquid crystalline properties were investigated by differential scanning calorimetry, polarising optical microscopy and X‐ray diffractometry. All complexes displayed mesogenic properties, which were smectic in the case of symmetric dendrons and their complexes and nematic in the case of asymmetric dendrons and their dendrimers. A supramolecular model for the lamellar mesophase, based mainly on X‐ray diffraction studies, is proposed. The electrochemical behaviour of dendritic complexes was investigated by cyclic voltammetry. The UV/Vis absorption and emission properties of the compounds and the photoconductive properties of the dendrons and dendrimers were also investigated |
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| Keywords: | dendrimers fluorescence hydrogen bonds liquid crystals photoconductivity |
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