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Related Experiment Video

Updated: May 27, 2026

Immunofluorescent Detection of Two Thymidine Analogues (CldU and IdU) in Primary Tissue
10:55

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Published on: December 7, 2010

Fluorescent uranyl ion lidded cucurbit[5]uril capsule.

S Kushwaha1, Srinivas A Rao, Padmaja P Sudhakar

  • 1Department of Chemistry, Faculty of Science, The M.S.University of Baroda, Vadodara-390002.

Inorganic Chemistry
|December 2, 2011
PubMed
Summary

A new fluorescent complex, U2CB5, was synthesized from cucurbituril (CB5) and uranyl nitrate. This complexation enhances the fluorescence of uranyl ions within a novel molecular capsule structure.

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Area of Science:

  • Supramolecular Chemistry
  • Coordination Chemistry
  • Materials Science

Background:

  • Cucurbiturils (CBs) are macrocyclic hosts with unique cavity structures.
  • Uranyl ions (UO2^2+) are known for their fluorescence properties.
  • Developing novel complexes with enhanced functionalities is a key research area.

Purpose of the Study:

  • To synthesize and characterize a novel fluorescent complex using cucurbit[5]uril (CB5) and uranyl nitrate.
  • To investigate the structural and photophysical properties of the resulting complex.
  • To explore the effect of CB5 complexation on uranyl ion fluorescence.

Main Methods:

  • Single-crystal X-ray diffraction for structural analysis.
  • Nuclear Magnetic Resonance (NMR) spectroscopy.
  • Fourier-Transform Infrared (FTIR) spectroscopy.
  • Thermogravimetric Analysis (TGA).

Main Results:

  • A novel fluorescent complex, {(UO(2))(2)(CB5)}(NO(3))(4)·4HNO(3).3H(2)O (U2CB5), was successfully synthesized.
  • Crystal structure revealed a closed molecular capsule with uranyl ions coordinated to CB5 portals, forming 2D frameworks.
  • Complexation with CB5 significantly enhanced the fluorescence of the uranyl ion.

Conclusions:

  • The study successfully demonstrates the formation of a novel uranyl-cucurbituril complex with enhanced fluorescence.
  • The unique structural arrangement contributes to the observed photophysical properties.
  • This work opens avenues for designing new fluorescent materials based on cucurbituril-metal ion interactions.