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Updated: Mar 30, 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-triphosPh Complexes

Published on: April 10, 2015

Ruthenium Complex "Light Switches" that are Selective for Different G-Quadruplex Structures.

Erin Wachter¹, Diego Moyá¹, Sean Parkin¹

¹Department of Chemistry, University of Kentucky, 505 Rose Street, Lexington, KY 40506 (USA).

Chemistry (Weinheim an Der Bergstrasse, Germany)

|November 13, 2015

Summary

Chemists developed new ruthenium(II) complexes with bromo-substituted ligands to target specific G-quadruplex DNA structures. These modified compounds show enhanced selectivity and stabilizing effects, aiding in the design of novel G-quadruplex probes.

Keywords:

G-quadruplexes light switch photochemistry photophysics ruthenium

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Single-Molecule Fluorescence Visualization of DNA Polymerase Dynamics at G-Quadruplexes

Single-Molecule Fluorescence Visualization of DNA Polymerase Dynamics at G-Quadruplexes

Published on: April 4, 2025

Area of Science:

Medicinal Chemistry
Nucleic Acid Chemistry
Photochemistry

Background:

G-quadruplex structures are crucial targets for developing new chemical tools and medicines.
Ruthenium(II) complexes with dipyridylphenazine (dppz) ligands act as photophysical and photochemical "light switches" for DNA.
Understanding G-quadruplex recognition is key for therapeutic advancements.

Purpose of the Study:

To investigate the effect of bromo-substituents on ruthenium(II)-dppz complexes for G-quadruplex selectivity.
To explore the stabilizing and covalent modification capabilities of these modified complexes.
To assess their potential as in vivo G-quadruplex probes.

Main Methods:

Synthesis of bromo-substituted dipyridylphenazine ligands.
Preparation of ruthenium(II) complexes: [Ru(bpy)2 dppz-Br](2+) and [Ru(bpy)2 dmdppz-Br](2+).
Incubation with specific G-quadruplex DNA structures and analysis of binding and stability.

Main Results:

Bromo-substitution enhanced selectivity for intermolecular parallel and mixed-hybrid G-quadruplexes.
[Ru(bpy)2 dppz-Br](2+) and [Ru(bpy)2 dmdppz-Br](2+) demonstrated a stabilizing effect on G-quadruplex DNA.
Light activation of [Ru(bpy)2 dmdppz-Br](2+) led to covalent adduct formation with DNA.

Conclusions:

Subtle chemical modifications in Ru(II) complexes can significantly alter G-quadruplex selectivity.
These bromo-substituted complexes show promise for stabilizing G-quadruplex structures.
The findings support the rational design of novel G-quadruplex probes for biological applications.