Self-assembly of thiacyanine dyes in water for the synthesis of active hybrid nanofibres |
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Authors: | Govindaswamy Shanker Gurumurthy Hegde |
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Affiliation: | 1. Department of Studies in Chemistry, Bangalore University, Central College Campus, Bangalore, India;2. International Iberian Nanotechnology Laboratory, Braga, Portugalmaanshanker@gmail.com carlos.rodriguez@inl.int;4. BMS R &5. D Centre, BMS College of Engineering, Bangalore, India |
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Abstract: | Water-soluble self-assembled nanostructures were synthesised by simple counter ion exchange of thiacyanine dyes which helps in the formation of nematic (N) and hexagonal (M) chromonic liquid-crystalline (CLCs) phases. Conjugated double bonds as central spacers connected between two benzothiazole segments affect water solubility and liquid crystal formation. Aggregation-dependent properties characterised by ultraviolet–visible, fluorescence and 1H nuclear magnetic resonance spectroscopy. Sol–gel reaction of dye aggregates with silica species furnishes entangled nanotubular fibres with constant diameter and their length in excess of micrometres, having templates of pore sizes below the mesoporous range. The π–π stacked chromonic aggregate dyes are also of importance in shape selective catalysis, adsorption, desorption micro-patterned materials, and provide a significant step towards biosensor medical applications because of their water-soluble nature. |
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Keywords: | Chromonic liquid crystals hybrid nanofibres aggregation-dependent properties sol–gel reactions |
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