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Updated: Apr 12, 2026
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An In Vitro Enzymatic Assay to Measure Transcription Inhibition by GalliumIII and H3 5,10,15-trispentafluorophenylcorroles
Published on: March 18, 2015
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Study on DNA binding behavior and light switch effect of new coumarin-derived Ru(II) complexes
Xue-Wen Liu1, You-Ming Shen1, Zhi-Xin Li1
1College of Chemistry and Chemical Engineering, Hunan University of Arts and Science, ChangDe 415000, PR China.
Summary
New ruthenium complexes featuring a coumarin ligand (mhcip) exhibit strong fluorescence and bind to DNA via intercalation. These complexes effectively cleave DNA under UV light and demonstrate light-switchable properties with copper ions and EDTA.
Area of Science:
- Coordination Chemistry
- Photochemistry
- Biophysical Chemistry
Background:
- Ruthenium complexes are investigated for their photophysical and DNA-binding properties.
- Coumarin derivatives can enhance fluorescence and influence the behavior of metal complexes.
Purpose of the Study:
- Synthesize and characterize novel ruthenium complexes with a coumarin-based ligand (mhcip).
- Investigate the DNA binding mode and photocleavage activity of these complexes.
- Explore the light-switchable properties of the complexes.
Main Methods:
- Synthesis and characterization of ruthenium-mhcip complexes.
- UV-visible spectroscopy, fluorescence spectroscopy, and viscosity measurements for DNA binding studies.
- Photocleavage assays under 365 nm irradiation.
- Investigation of switchable properties using Cu(2+) and EDTA.
Main Results:
- Successful synthesis of [Ru(L)2mhcip](2+) complexes (L=bpy, phen).
- Evidence of intercalative binding to CT-DNA.
- Efficient DNA photocleavage upon UV irradiation.
- Demonstrated light-switch on/off capabilities.
Conclusions:
- The coumarin ligand contributes to the strong fluorescence of the ruthenium complexes.
- The complexes are effective DNA intercalators and photocleavage agents.
- The developed complexes show potential for light-controlled molecular devices.
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