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Understanding excited states in metal nanoclusters (NCs) is key for designing new materials. This study reveals Ag-DNA complexes exhibit ultrafast relaxation and geometry changes, not solvent effects, driving their unique optical properties.

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Area of Science:

  • Photochemistry and Nanomaterials Science
  • Investigating excited-state dynamics in ligand-stabilized metal nanoclusters (NCs).

Background:

  • Atomic-level understanding of electronically excited states in metal nanoclusters (NCs) is crucial for designing new NCs.
  • Ligand-stabilized metal nanoclusters exhibit unique photophysical properties.

Purpose of the Study:

  • To investigate the emission dynamics and relaxation pathways of a silver-DNA (Ag-DNA) complex.
  • To elucidate the origins of the Stokes shift in Ag-DNA complexes.

Main Methods:

  • Utilized fluorescence up-conversion spectroscopy to study emission dynamics.
  • Performed theoretical calculations on model Ag3+ clusters with DNA bases (cytosine and guanine).

Main Results:

  • Observed ultrafast relaxation (<100 fs) from the Franck-Condon state to the emissive state in Ag-DNA complexes, despite a large Stokes shift.
  • Calculations indicated substantial Ag3+ cluster geometry changes in the excited state, explaining the observed Stokes shift.
  • Identified a "dark cluster" species with ultrafast excited-state decay (200 fs), requiring further investigation.

Conclusions:

  • The Stokes shift in Ag-DNA complexes is primarily attributed to Ag cluster geometry changes in the excited state, not solvent/DNA reorganization.
  • Ultrafast relaxation dynamics are characteristic of these Ag-DNA systems.
  • The nature of the ultrafast deactivation in the "dark cluster" remains an open question.