# Photophysical and DNA‐Binding Properties of Phenoxazine‐Based Push–Pull Type Organic Chromophores: Insights From DFT, Molecular Docking, and Optical Studies

## TL;DR

This study explores how phenoxazine-based dyes interact with DNA, using experiments and simulations to show their potential for biological applications.

## Contribution

The study introduces a new class of phenoxazine-based push–pull dyes with strong DNA-binding properties and provides insights into their photophysical behavior.

## Key findings

- UV spectroscopy confirmed intercalative DNA binding of the dyes.
- DFT and molecular docking revealed the influence of structural configuration on DNA interactions.
- PO5 showed the strongest DNA-binding potential among the tested dyads.

## Abstract

In this work, we investigate the photophysical and DNA‐binding characteristics of phenoxazine‐based organic dyads comprising donor–acceptor configuration, with the goal of boosting their potential for biointeractive applications. The interaction of these dyes with calf thymus DNA was analyzed using UV spectroscopy, confirming their intercalative binding to DNA base pairs. A straightforward UV spectroscopic approach was developed to elucidate the binding mechanisms between DNA and the dyes. Furthermore, density functional theory (DFT) and time‐dependent DFT calculations provided valuable insights into their electronic structures, optical parameters, and insights of frontier molecular orbitals. Molecular electrostatic potential simulations and mapping helped clarify the electron density distributions that are key for DNA interactions. Finally, molecular docking studies backed up these findings that the structural configuration of nucleic acids significantly influences the binding interactions of push–pull organic dyads, suggesting that these dyes could be promising for use in biological imaging and therapeutic applications.

This study investigates the interaction of phenoxazine‐based organic dyads (PO1, PO2, PO4, and PO5) with calf thymus DNA using UV–visible spectroscopy, theoretical HOMO–LUMO analysis, and molecular docking techniques. The results reveal strong DNA‐binding interactions of these dyads, particularly PO5, highlighting their potential in biochemical and biophysical applications.© 2026 WILEY‐VCH GmbH