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The 1:1 host-guest complexation between cucurbit[7]uril and styryl dye.

Denis A Ivanov1, Nikolai Kh Petrov, Ekaterina A Nikitina

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The Journal of Physical Chemistry. A
|April 8, 2011
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The binding of cucurbit[7]uril (CB[7]) to a styryl dye enhances its fluorescence. This host-guest complex formation, studied via fluorescence spectroscopy, reveals significant changes in the dye's photophysical properties.

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Area of Science:

  • Supramolecular Chemistry
  • Photophysics
  • Materials Science

Background:

  • Styryl dyes exhibit interesting photophysical properties.
  • Cucurbiturils are macrocyclic hosts capable of forming inclusion complexes.
  • Understanding host-guest interactions is crucial for developing new functional materials.

Purpose of the Study:

  • To investigate the photophysical properties of a styryl dye (dye 1) in aqueous solution.
  • To study the interaction between dye 1 and cucurbit[7]uril (CB[7]).
  • To characterize the formation and properties of dye 1-CB[7] host-guest complexes.

Main Methods:

  • Fluorescence spectroscopy
  • Absorption spectroscopy
  • Anisotropy fluorescence measurements
  • Quantum-chemical calculations

Main Results:

  • Formation of 1:1 host-guest complexes between dye 1 and CB[7] with a binding constant (K) of 1.0 × 10^6 M^-1.
  • A 5-fold increase in fluorescence intensity and an isosbestic point at 396 nm were observed upon CB[7] addition.
  • Average fluorescence lifetime increased from 145 ps to 352 ps.
  • Rotational relaxation times increased from 119 ps to 277 ps, indicating restricted rotation within the host cavity.
  • Experimental and computational data confirmed that dye 1 rotates as a whole within the CB[7] cavity.

Conclusions:

  • Cucurbit[7]uril effectively forms stable host-guest complexes with the studied styryl dye.
  • Complexation significantly alters the photophysical properties of the dye, including fluorescence intensity and lifetime.
  • The dye molecule undergoes restricted rotational motion when encapsulated within the cucurbit[7]uril cavity.