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Aggregation-induced emissive copper(I) complexes for living cell imaging.

Xue-Lian Xin1, Min Chen, Yu-bo Ai

  • 1School of Chemistry and Chemical Engineering & Jiangsu Key Laboratory of Green Synthetic Chemistry for Functional Materials, Jiangsu Normal University , Xuzhou, Jiangsu 221116, China.

Inorganic Chemistry
|February 25, 2014
PubMed
Summary

New binuclear copper(I) complexes exhibit aggregation-induced phosphorescence emission (AIPE) and are successfully used for living cell imaging. These stable complexes show potential for advanced imaging applications.

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Area of Science:

  • Coordination Chemistry
  • Materials Science
  • Photophysics

Background:

  • Development of novel phosphorescent materials for imaging applications.
  • Exploration of binuclear copper(I) complexes with unique structural and photophysical properties.
  • Significance of aggregation-induced emission (AIE) and aggregation-induced phosphorescence emission (AIPE) in advanced materials.

Purpose of the Study:

  • Synthesize and characterize novel binuclear copper(I) complexes with varying diphosphine ligands.
  • Investigate the structural conformations and stability of the synthesized complexes.
  • Evaluate the aggregation-induced phosphorescence emission (AIPE) behavior and potential for live cell imaging.

Main Methods:

  • Synthesis of binuclear copper(I) complexes using [Cu(NCCH3)4]ClO4, 3,8-dibromo-1,10-phenanthroline (BrphenBr), and diphosphine ligands.
  • Structural analysis using X-ray crystallography to determine metallacycle conformations.
  • Electrospray Ionization Mass Spectrometry (ESI-MS) to study cationic stability.
  • Photoluminescence spectroscopy to assess aggregation-induced phosphorescence emission (AIPE) in mixed solvents.
  • Live cell imaging experiments using HeLa cells.

Main Results:

  • Successfully synthesized four binuclear copper(I) complexes (Cu-1 to Cu-4) with different diphosphine ligands.
  • Complex Cu-4 displayed both eclipsed and staggered conformations of the 18-membered Cu2C12P4 metallacycles.
  • All complexes demonstrated high stability to air and moisture due to steric protection and electronic effects.
  • Complexes exhibited significant aggregation-induced phosphorescence emission (AIPE) in CH2Cl2/hexane.
  • Successful application of complexes for green intracellular emission imaging in living HeLa cells via aggregation-induced emission (AIE).

Conclusions:

  • The synthesized binuclear copper(I) complexes are stable and possess unique conformational diversity.
  • The observed aggregation-induced phosphorescence emission (AIPE) is attributed to the restriction of intramolecular rotation.
  • These complexes show promise as effective probes for live cell imaging, demonstrating aggregation-induced emission (AIE).