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Molecular structure, binding, and disorder in TDBC-Ag plexcitonic assemblies.

J Baños-Gutiérrez1, R Bercy2, Y García Jomaso3

  • 1Instituto de Quimica, Universidad Nacional Autonoma de Mexico, Circuito Exterior, Ciudad Universitaria, Alcaldía Coyoacán C.P., 04510 Ciudad de Mexico, Mexico.

The Journal of Chemical Physics
|July 1, 2026
PubMed
Summary
This summary is machine-generated.

This study reveals how TDBC dye molecules pack and orient on silver nanodisks, crucial for understanding plexcitonic hybrid materials. The findings detail molecular geometry changes upon adsorption, impacting light-matter interactions.

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Area of Science:

  • * Nanoscience and Materials Science
  • * Physical Chemistry
  • * Spectroscopy

Background:

  • * Plexcitonic assemblies are hybrid materials coupling plasmonic nanoparticles with molecular emitters.
  • * Strong coupling leads to hybridized upper and lower polariton branches.
  • * Understanding molecular geometry at metal interfaces is key but challenging.

Purpose of the Study:

  • * To comprehensively characterize the structure of a TDBC-silver nanodisk plexciton.
  • * To elucidate how molecular packing and conformation change upon adsorption.
  • * To establish a structural benchmark for geometry-dependent photophysics.

Main Methods:

  • * Nuclear Magnetic Resonance (NMR) spectroscopy
  • * Terahertz-Raman spectroscopy
  • * Density Functional Theory (DFT) calculations

Main Results:

  • * TDBC monomers adopt an asymmetric sulfobutyl chain conformation.
  • * J-aggregates show symmetric chain alternation, distorted upon adsorption.
  • * Specific Raman modes and NOESY peaks indicate aggregation geometry and adsorption effects.

Conclusions:

  • * Molecular geometry and interfacial arrangement in TDBC-silver plexcitons are constrained.
  • * Adsorption on silver nanodisks disrupts long-range order in TDBC J-aggregates.
  • * Provides a structural basis for understanding photophysics in exciton-plasmon systems.