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Related Concept Videos

Photoluminescence: Applications01:14

Photoluminescence: Applications

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Photoluminescence offers a wide range of applications due to its inherent sensitivity and selectivity. This technique allows for both direct and indirect analyses of the analyte. Direct quantitative analysis is possible when the analyte exhibits a favorable quantum yield for fluorescence or phosphorescence. However, an indirect analysis may be feasible if the analyte is not fluorescent or phosphorescent, or if the quantum yield is unfavorable. Indirect methods include reacting the analyte with...
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A [2]Rotaxane-Based Circularly Polarized Luminescence Switch.

Arthur H G David1, Raquel Casares1, Juan M Cuerva1

  • 1Departamento de Química Orgánica, Facultad de Ciencias, Unidad de Excelencia de Química Aplicada a Biomedicina y Medioambiente (UEQ) , Universidad de Granada (UGR) , Avda. Fuente Nueva S/N , Granada 18071 , Spain.

Journal of the American Chemical Society
|October 23, 2019
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Summary
This summary is machine-generated.

A novel rotaxane molecular shuttle switches circularly polarized luminescence (CPL) "on" or "off" by repositioning a fluorescent macrocycle. This controlled chiroptical activity relies on chiral information transfer via hydrogen bonding.

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Area of Science:

  • Supramolecular Chemistry
  • Organic Chemistry
  • Materials Science

Background:

  • Molecular machines offer precise control over molecular functions.
  • Circularly polarized luminescence (CPL) is a sensitive chiroptical property.
  • Rotaxanes are mechanically interlocked molecules with potential in molecular devices.

Purpose of the Study:

  • To synthesize a rotaxane-based molecular shuttle.
  • To control CPL by altering the position of a macrocycle on a molecular thread.
  • To investigate chiral information transfer in supramolecular systems.

Main Methods:

  • Synthesis of a rotaxane featuring a fluorescent macrocycle and a chiral thread.
  • Utilizing hydrogen bonding for chiral information transfer.
  • Employing acid-base stimuli to control macrocycle position and CPL.

Main Results:

  • The molecular shuttle successfully switches CPL "on" and "off" reversibly.
  • Fluorescence profiles and quantum yields remain consistent in both states.
  • Chiral information transfer from phenylalanine residues to the macrocycle induces CPL.
  • Base-induced switching disables chiral information transfer, turning CPL "off".

Conclusions:

  • The rotaxane system demonstrates controllable CPL switching via molecular shuttling.
  • This work highlights the potential of rotaxanes for developing advanced chiroptical materials.
  • The system exhibits reversible switching behavior upon acid-base cycling.