Novel supramolecular conjugated polyrotaxane as an acid-base controllable optical molecular switch

[Display omitted] •Two comparable conjugated polymers (axle polymer P1 and poly-rotaxane P2) have been sythesied.•Polyrotaxane P2 is acid-base controllable and carrying the molecular switching property.•Polyrotaxane P2 is selective and sensitive for Fe3+ ion. To study the supramolecular interactions...

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Published in:Sensors and actuators. B, Chemical Chemical, 2017-05, Vol.243, p.84-95
Main Authors: Shukla, Tarun, Arumugaperumal, Reguram, Raghunath, Putikam, Lin, Ming-Chang, Lin, Chien-Min, Lin, Hong-Cheu
Format: Article
Language:English
Subjects:
Acid-base molecular switch
Acids
Chemical compounds
Chemical reactions
Chemical synthesis
Computational study
Copolymerization
Fluorine
Mechanically interlocked rotaxane
Molecular machines
Molecular structure
Monomers
NMR
Nuclear magnetic resonance
Organic chemicals
Phenanthroimidazole
Polymers
Polyrotaxane
Protonation
Self-assembly
Shafts (machine elements)
Switching
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Summary:[Display omitted] •Two comparable conjugated polymers (axle polymer P1 and poly-rotaxane P2) have been sythesied.•Polyrotaxane P2 is acid-base controllable and carrying the molecular switching property.•Polyrotaxane P2 is selective and sensitive for Fe3+ ion. To study the supramolecular interactions of the mechanically interlocked rotaxane pendants with the backbone of two comparable conjugated polymers, axle polymer P1 and polyrotaxane P2 were synthesized by copolymerization of fluorine-based monomer F with phenanthroimidazole (PIZ)-based axle monomer A and rotaxane monomer R, respectively. Prevailing 1H NMR, UV–vis and PL profiles revealed that polyrotaxane P2 showed sensitive and reversible acid-base molecular switching properties via supramolecular interactions in contrast to the other analogous polymer P1. The capability of molecular switching is also proven by computational study. Apparently, the controllable nano self-assembly process of P2 was fulfilled by reversible acid-base molecular switch approaches, where the orthogonal H-bonded polyrotaxane units were converted from bloated form into flake form on protonation.
ISSN:0925-4005
1873-3077
DOI:10.1016/j.snb.2016.11.130