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pH-Switchable "Off-On-Off" Near-Infrared Luminescence Based on a Dinuclear Ruthenium(II) Complex
Ting-Ting Meng1, Hao Wang1, Ze-Bao Zheng1
1Beijing Key Laboratory of Energy Conversion and Storage Materials, College of Chemistry, Beijing Normal University , Beijing 100875, P. R. China.
Inorganic Chemistry
|April 8, 2017
Summary
Researchers developed a novel ruthenium(II) complex exhibiting pH-switchable near-infrared (NIR) phosphorescence. This bright NIR emission is promising for advanced molecular devices and bioimaging applications.
Area of Science:
- Coordination Chemistry
- Photophysics
- Materials Science
Background:
- Near-infrared (NIR) phosphorescence from ruthenium(II) polypyridyl complexes is rare, limiting applications in sensing and molecular devices.
- Developing switchable luminescent materials is crucial for advanced technologies.
Purpose of the Study:
- To synthesize and characterize a novel dinuclear ruthenium(II) complex with pH-switchable NIR phosphorescence.
- To investigate the photophysical properties and pH-responsive luminescence of the complex.
Main Methods:
- Synthesis of a dinuclear ruthenium(II) complex.
- Photoluminescence spectroscopy to determine emission wavelength, quantum yield, and lifetime.
- pH-dependent luminescence studies in Britton-Roberson buffer.
Main Results:
- The complex displays bright NIR emission centered at 760 nm with a 1.03% quantum yield and a 108.3 ns lifetime.
- pH-induced "off-on-off" luminescence switching was observed with a 41-fold intensity enhancement.
- Switching events occurred near the physiological pH range.
Conclusions:
- The novel dinuclear ruthenium(II) complex exhibits desirable NIR phosphorescence properties.
- The pH-switchable luminescence makes it a promising candidate for smart sensors and molecular logic devices.