DNA-based molecular wires: multiple emission pathways of individual constructs

Area of Science:

• Molecular Biophysics
• Nanotechnology
• Supramolecular Chemistry

Background:

• Understanding energy transfer in molecular systems is crucial for developing new nanoscale devices.
• DNA-based molecular wires offer a versatile platform for controlled energy transport due to their self-assembly properties.

Purpose of the Study:

• To investigate photon energy transfer efficiency and dynamics in individual DNA-based molecular wires.
• To probe the relationship between DNA integrity and energy transfer performance.
• To explore the pathways and mechanisms of energy transport at the single-molecule level.

Main Methods:

• Single-molecule spectroscopy was employed to analyze individual DNA molecular wires.
• Pulse interleaved excitation imaging was used to resolve time-resolved spectral responses.
• Simultaneous probing of DNA integrity was performed to correlate structure with function.

Main Results:

• Photon energy transfer efficiencies approaching 100% were observed across five dyes in intact DNA wires.
• Direct resolution of the time evolution spectral response provided insights into energy transfer dynamics.
• Dynamical and multiple energy transfer pathways were identified, influenced by the conformational freedom of the molecular wire.

Conclusions:

• DNA-based molecular wires demonstrate highly efficient photon energy transport at the single-molecule level.
• Conformational dynamics play a significant role in modulating energy transfer pathways.
• These findings guide the design of advanced DNA-based supramolecular arrays for enhanced nanoscale energy transport.