1. Supramolecular Control on the Optical Properties of a Dye‐Polyelectrolyte Assembly
- Author
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Prabhat K. Singh, Shrishti P. Pandey, and Ankur A. Awasthi
- Subjects
Materials science ,Optical Phenomena ,Macromolecular Substances ,Supramolecular chemistry ,Nanotechnology ,02 engineering and technology ,010402 general chemistry ,01 natural sciences ,Polystyrene sulfonate ,chemistry.chemical_compound ,Molecule ,Physical and Theoretical Chemistry ,Fluorescent Dyes ,chemistry.chemical_classification ,Molecular Structure ,Cyclodextrin ,beta-Cyclodextrins ,Cationic polymerization ,021001 nanoscience & nanotechnology ,Polyelectrolytes ,Fluorescence ,Atomic and Molecular Physics, and Optics ,Polyelectrolyte ,0104 chemical sciences ,chemistry ,Benzophenoneidum ,Polystyrenes ,Absorption (chemistry) ,0210 nano-technology - Abstract
Control of fluorescent molecular assemblies is an exciting area of research with large potential for various important applications, such as, fluorescence sensing/probing, cell imaging and monitoring drug-delivery. In the present contribution, we have demonstrated control on the extent of aggregation of a dye-polyelectrolyte assembly using a macrocyclic host molecule, sulfobutylether-β-cyclodextrin (SBE-β-CD). Initially, a cationic molecular rotor based organic dye, Auramine-O (AuO), undergoes aggregation in the presence of an anionic polyelectrolyte, polystyrene sulfonate (PSS), and displays a broad intense new emission band along with large variation in its absorption features and excited-state lifetime. A manipulation of the monomer-aggregate equilibrium of the dye-polyelectrolyte assembly has been achieved by introducing a cyclodextrin based supramolecular host, SBE-β-CD, which leads to relocation of AuO molecules from polyelectrolyte (PSS) to supramolecular host cavity, owing to the formation of a host-guest complex between AuO and SBE-β-CD. A reversible control on this manipulation of monomer-aggregate equilibrium is further achieved by introducing a competitive guest for the host cavity i. e., 1-Adamantanol. Thus, we have demonstrated an interesting control on the dye-polyelectrolyte aggregate assembly using a supramolecular host molecule which open up exciting possibilities to construct responsive materials using a repertoire of various host-specific guest molecules.
- Published
- 2021