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      Cucurbit [7] uril-threaded fluorene-thiophene-based conjugated polyrotaxanes

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      Author(s)
      Idris, M.
      Bazzar, M.
      Guzelturk, B.
      Demir, Hilmi Volkan
      Tuncel, D.
      Date
      2016
      Source Title
      RSC Advances
      Print ISSN
      2046-2069
      Publisher
      Royal Society of Chemistry
      Volume
      6
      Issue
      100
      Pages
      98109 - 98116
      Language
      English
      Type
      Article
      Item Usage Stats
      226
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      262
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      Abstract
      Here we investigate the effect of cucurbit[7]uril (CB7) on the thermal and optical properties of fluorene-thiophene based conjugated polyelectrolytes. For this purpose, poly(9,9′-bis(6′′-(N,N,N-trimethylammonium)hexyl)fluorene-alt-co-thiophenelene) P1 and poly(9,9′-bis(6′′-(N,N,N-trimethylammonium)propyl)fluorene-alt-co-thiophenelene) P2 and their CB7-based polyrotaxane counterparts, P1CB7 and P2CB7, are synthesized by threading the part of the conjugated backbone of these polymers with CB7 during their synthesis. Threading efficiency in the P1CB7 containing hexyl pendant of as high as 50% is achieved, but in the case of P2, with the propyl pendant, only around 15% is achieved. We observed significant changes in the optical properties of both P1CB7 and P2CB7 with respect to their polymers P1 and P2. Fluorescent quantum yields of P1 and P2 which are 0.11 and 0.35 have increased to 0.46 and 0.55 for P1CB7 (>4 fold) and P2CB7, respectively. Moreover, polyrotaxanes compared to their polymers exhibit longer fluorescence lifetimes in the solution and the solid state thanks to the suppressed overall nonradiative recombination via encapsulation of the conjugated polymer backbone. Thermal analysis also indicates that polyrotaxanes have higher thermal stabilities than their polymer counterparts. In order to demonstrate the applicability of the synthesized materials, we also fabricated proof-of-concept light emitting diodes from P1 and its CB7-based polyrotaxane counterpart P1CB7. The CB7-integrating polymer showed lower turn-on voltages with high electroluminescence colour purity due to balanced charge injection in P1CB7 as compared to the P1 polymer.
      Keywords
      Fluorescence
      Hydrogels
      Light emitting diodes
      Optical properties
      Polyelectrolytes
      Thermoanalysis
      Thiophene
      Balanced charge injection
      Conjugated backbones
      Conjugated polyelectrolytes
      Fluorene-thiophene
      Fluorescence lifetimes
      Non-radiative recombinations
      Proof of concept
      Synthesized materials
      Conjugated polymers
      Permalink
      http://hdl.handle.net/11693/36671
      Published Version (Please cite this version)
      http://dx.doi.org/10.1039/c6ra21622f
      Collections
      • Department of Chemistry 707
      • Department of Electrical and Electronics Engineering 4012
      • Department of Physics 2551
      • Institute of Materials Science and Nanotechnology (UNAM) 2260
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