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Updated: Jul 1, 2026

The Synthesis, Characterization and Reactivity of a Series of Ruthenium N-triphosPh Complexes

The Synthesis, Characterization and Reactivity of a Series of Ruthenium N-triphos^Ph Complexes

Published on: April 10, 2015

Donor/acceptor interactions in systematically modified Ru(II)-Os(II) oligonucleotides.

Dennis J Hurley¹, Yitzhak Tor

¹Department of Chemistry and Biochemistry, University of California, San Diego, La Jolla, California 92093-0358, USA.

Journal of the American Chemical Society

|October 31, 2002

Summary

Donor/acceptor interactions in DNA duplexes were studied using ruthenium(II) and osmium(II) nucleosides. Energy transfer mechanisms were analyzed, revealing Förster dipole-dipole transfer as dominant, with potential Dexter mechanism contributions at short distances.

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Published on: August 23, 2018

Area of Science:

Photochemistry and Photophysics
Supramolecular Chemistry
Biophysical Chemistry

Background:

Donor/acceptor (D/A) interactions are crucial in energy transfer processes.
DNA duplexes offer a versatile scaffold for studying molecular interactions due to their defined structure.
Understanding energy transfer mechanisms in DNA is vital for developing novel molecular devices and probes.

Purpose of the Study:

To investigate donor/acceptor (D/A) interactions in modified DNA duplexes.
To elucidate the dominant energy transfer mechanism (Förster vs. Dexter) in DNA-bridged systems.
To analyze the influence of linker rigidity on energy transfer dynamics.

Main Methods:

Synthesis of 19-mer DNA duplexes with ethynyl-linked Ru(II) donor and Os(II) acceptor nucleosides at varying distances.
Steady-state and time-resolved luminescence spectroscopy to measure quenching and excited-state lifetimes.
Analysis of energy transfer using Förster and Dexter mechanisms, including orientation factor considerations.

Main Results:

Ru(II) luminescence quenching decreased with increasing separation between donor and acceptor (16 Å to 61 Å).
Excited-state lifetimes showed a linear correlation with quenching efficiency.
Analysis indicated Förster dipole-dipole energy transfer as the primary mechanism, with deviations possibly due to orientation factors.
Replacing a rigid linker with a flexible one improved Förster mechanism correlation.
Surprisingly, Dexter mechanism analysis also showed good correlation, highlighting the complexity of interpreting D/A interactions.

Conclusions:

Förster dipole-dipole energy transfer is the dominant pathway for D/A interactions in these DNA duplexes.
A minor contribution from the Dexter electron exchange mechanism may occur at short distances.
The study emphasizes the potential for Förster systems to exhibit Dexter-like behavior, cautioning against oversimplified models for DNA-bridged dyads.