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PreprintCC BY-NCChemRxiv

Excited-State Dynamics in 4-Dimethylamino-4’-Nitrostilbene in Solution: The Role of Solvent Relaxation and Reabsorption Effects

  • Marco Kapitzke1,2
  • Julia Stähler1,2,3,4
  • Sergey Kovalenko1,2
  • Samuel Palato1,2
4 affiliations
  1. 1Department of Chemistry
  2. 2Humboldt-Universität zu Berlin
  3. 3Department of Physical Chemistry
  4. 4Fritz-Haber-Institut der Max-Planck-Gesellschaft
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Abstract

Push-pull donor-acceptor stilbenes are model systems for probing solvation dynamics and intramolecular processes. However, the precise nature of the excited-state evolution remains debated. To obtain a comprehensive picture of the processes involved, we combine broadband ultrafast spectroscopies, fluorescence up-conversion and transient absorption, to study the excited-state evolution of 4-dimethylamino-4’-nitrostilbene (DANS) in solvents of increasing polarity (from cyclohexane to acetonitrile). We demonstrate that the evolution is fully described by solvent relaxation only, perturbed by reabsorption effects due to transient overlap between the fluorescence and excited-state absorption bands. No intramolecular charge-transfer is involved in the observed dynamics. We extract the solvation correlation function C(t) in dibutyl ether, diethyl ether, tetrahydrofuran and acetonitrile. This work highlights the strength of combining broadband femtosecond absorption/fluorescence to disentangle the solvation dynamics from intramolecular contributions.

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Cite

BibTeXRIS
BibTeX
@misc{kapitzke2026excitedstate,
  title = {{Excited-State Dynamics in 4-Dimethylamino-4’-Nitrostilbene in Solution: The Role of Solvent Relaxation and Reabsorption Effects}},
  author = {Marco Kapitzke and Julia Stähler and Sergey Kovalenko and Samuel Palato},
  howpublished = {ChemRxiv},
  year = {2026},
  month = aug,
  doi = {10.26434/chemrxiv.15008105/v1},
  url = {https://chemrxiv.org/doi/full/10.26434/chemrxiv.15008105/v1},
  note = {CC BY-NC},
}
RIS
TY  - UNPB
TI  - Excited-State Dynamics in 4-Dimethylamino-4’-Nitrostilbene in Solution: The Role of Solvent Relaxation and Reabsorption Effects
AU  - Marco Kapitzke
AU  - Julia Stähler
AU  - Sergey Kovalenko
AU  - Samuel Palato
PY  - 2026
DA  - 2026/08/31
PB  - ChemRxiv
DO  - 10.26434/chemrxiv.15008105/v1
UR  - https://chemrxiv.org/doi/full/10.26434/chemrxiv.15008105/v1
AB  - Push-pull donor-acceptor stilbenes are model systems for probing solvation dynamics and intramolecular processes. However, the precise nature of the excited-state evolution remains debated. To obtain a comprehensive picture of the processes involved, we combine broadband ultrafast spectroscopies, fluorescence up-conversion and transient absorption, to study the excited-state evolution of 4-dimethylamino-4’-nitrostilbene (DANS) in solvents of increasing polarity (from cyclohexane to acetonitrile). We demonstrate that the evolution is fully described by solvent relaxation only, perturbed by reabsorption effects due to transient overlap between the fluorescence and excited-state absorption bands. No intramolecular charge-transfer is involved in the observed dynamics. We extract the solvation correlation function C(t) in dibutyl ether, diethyl ether, tetrahydrofuran and acetonitrile. This work highlights the strength of combining broadband femtosecond absorption/fluorescence to disentangle the solvation dynamics from intramolecular contributions.
ER  -