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Directed Energy Transfer through DNA-Templated J-Aggregates.

Sarthak Mandal1, Xu Zhou, Su Lin

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DNA nanotechnology enables precise organization of pseudoisocyanine (PIC) J-aggregates for efficient long-range energy transfer in molecular photonic devices.

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Area of Science:

  • Molecular excitonics
  • DNA nanotechnology
  • Photonic materials

Background:

  • Molecular dye aggregates exhibit optoelectronic properties similar to natural light harvesting complexes.
  • Efficient long-range optical excitation energy transfer is crucial for molecular photonic devices.
  • Rational design of dye aggregates with controlled organization and dynamics is challenging.

Purpose of the Study:

  • To characterize the excitonic properties of DNA-templated pseudoisocyanine (PIC) J-aggregates.
  • To investigate the influence of DNA template length and sequence on J-aggregate properties.
  • To evaluate the efficiency of energy transfer through DNA-templated J-aggregate bridges.

Main Methods:

  • Spectroscopic characterization of PIC J-aggregates on poly(dA)-poly(dT) DNA templates.
  • Utilizing DNA nanotechnology to organize J-aggregates with controlled continuity.
  • Employing quantum dots (QDs) as energy donors and Alexa Fluor 647 (AF647) as energy acceptors.

Main Results:

  • Excitonic properties of DNA-templated J-aggregates are dependent on DNA template length and sequence.
  • A GC base pair gap in the DNA template significantly reduces excitation delocalization in J-aggregates.
  • Efficient long-range energy transfer from QD to AF647 is achieved via DNA-templated J-aggregate bridges.

Conclusions:

  • DNA-templated J-aggregates offer a pathway for constructing molecular excitonic circuits.
  • Precise control over DNA template structure allows tuning of exciton dynamics and energy transfer.
  • These findings advance the development of molecular-scale photonic devices.