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Structural disorder in molecular aggregates impacts optical properties. This study uses linewidth analysis on individual zinc-chlorin (ZnChl) nanotubes to reveal how molecular orientation variations explain spectral anomalies.

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Area of Science:

  • Molecular aggregates
  • Supramolecular chemistry
  • Optical spectroscopy

Background:

  • Structural disorder in molecular aggregates significantly affects optical functionality.
  • Ensemble measurements are insufficient for characterizing intra-aggregate structural disorder.
  • Zinc-chlorin (ZnChl) nanotubular molecular aggregates exhibit spectral anomalies.

Purpose of the Study:

  • To characterize intra-aggregate structural disorder in ZnChl nanotubes.
  • To investigate the anomaly in linewidths between higher-energy and lower-energy absorption bands.
  • To model the correlation of linewidths to understand structural variations.

Main Methods:

  • Single-aggregate fluorescence excitation experiments.
  • Linewidth analysis of absorption bands.
  • Frenkel exciton modeling.

Main Results:

  • Observed anomaly in linewidths: higher-energy bands are narrower than lower-energy bands.
  • Correlation between linewidths of different bands was analyzed for individual aggregates.
  • Frenkel exciton model successfully explained the observed linewidth correlations.

Conclusions:

  • Small variations in molecular orientations within aggregates are the cause of the observed spectral anomalies.
  • Single-aggregate spectroscopy combined with theoretical modeling is effective for probing structural disorder.
  • Understanding structural disorder is crucial for controlling the optical functionality of molecular aggregates.