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Träfflista för sökning "WFRF:(Svensson Olof) ;pers:(Ramström Olof)"

Sökning: WFRF:(Svensson Olof) > Ramström Olof

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1.
  • Ren, Yansong, et al. (författare)
  • A Multicontrolled Enamine Configurational Switch Undergoing Dynamic Constitutional Exchange
  • 2018
  • Ingår i: Angewandte Chemie International Edition. - : Wiley. - 1433-7851 .- 1521-3773. ; 57:21, s. 6256-6260
  • Tidskriftsartikel (refereegranskat)abstract
    • A multiresponsive enamine-based molecular switch is presented, in which forward/backward configurational rotation around the C=C bond could be precisely controlled by the addition of an acid/base or metal ions. Fluorescence turn-on/off effects and large Stokes shifts were observed while regulating the switching process with CuII. The enamine functionality furthermore enabled double dynamic regimes, in which configurational switching could operate in conjunction with constitutional enamine exchange of the rotor part. This behavior was used to construct a prototypical dynamic covalent switch system through enamine exchange with primary amines. The dynamic exchange process could be readily turned on/off by regulating the switch status with pH.
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2.
  • Ren, Yansong, et al. (författare)
  • Multistimuli-Responsive Enaminitrile Molecular Switches Displaying H+-Induced Aggregate Emission, Metal Ion-Induced Turn-On Fluorescence, and Organogelation Properties
  • 2018
  • Ingår i: Journal of the American Chemical Society. - : American Chemical Society (ACS). - 0002-7863 .- 1520-5126. ; 140:42, s. 13640-13643
  • Tidskriftsartikel (refereegranskat)abstract
    • Multistimuli-responsive enaminitrile-based configurational switches displaying aggregation-induced emission (AIE), fluorescence turn-on effects, and super gelation properties are presented. The E-isomers dominated (>97%) in neutral/basic solution, and the structures underwent precisely controlled switching around the enamine C=C bond upon addition of acid/base. Specific fluorescence output was observed in response to different external input in the solution and solid states. In response to H+, configurational switching resulted in complete formation of the nonemissive Z-H+-isomers in solution, however displaying deep-blue to blue fluorescence (Phi(F) up to 0.41) in the solid state. In response to Cu-II in the solution state, the E-isomers exhibited intense, turn-on, blue-green fluorescence, which could be turned off by addition of competitive coordination. The acid/base-activated switching, together with the induced AIE-effects, further enabled the accomplishment of a responsive superorganogelator. In nonpolar solvents, a blue-fluorescent supramolecular gel was formed upon addition of acid to the E-isomer suspension. The gelation could be reversed by addition of base, and the overall, reversible process could be repeated at least five cycles.
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  • Resultat 1-2 av 2
Typ av publikation
tidskriftsartikel (2)
Typ av innehåll
refereegranskat (2)
Författare/redaktör
Ramström, Olof (2)Ta bort avgränsningen
Ren, Yansong (2)
Svensson Grape, Erik (1)
Inge, A. Ken (1)
Svensson, Per H. (1)
Xie, Sheng (1)
Lärosäte
Kungliga Tekniska Högskolan (2)
Stockholms universitet (1)
Linnéuniversitetet (1)
RISE (1)
Språk
Engelska (2)
Forskningsämne (UKÄ/SCB)
Naturvetenskap (2)
År
2018 (2)

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