Details
| Original language | English |
|---|---|
| Pages (from-to) | 12189-12196 |
| Number of pages | 8 |
| Journal | Journal of Physical Chemistry B |
| Volume | 128 |
| Issue number | 49 |
| Early online date | 26 Nov 2024 |
| Publication status | Published - 12 Dec 2024 |
Abstract
We use femtosecond transient broadband absorption spectroscopy (TAS) to characterize Rose Bengal in water/methanol solutions and reveal a continuous tunability of intersystem crossing (ISC) times by changing the mole fraction of the solvents. We find that the transients of excited state absorptions (ESAs) in Rose Bengal at ∼430 nm can be attributed to transitions from the singlet state S1, with decay times of 74 ps via ISC in pure water and up to 405 ps in pure methanol. TA measurements at near-infrared wavelengths, on the other hand, reveal the rise of an ESA at ∼1080 nm from the triplet state T1 with time constants of 68 and 491 ps in pure water and methanol, respectively, strongly supporting the associated UV-vis TAS data. Solvent mixtures show a quasi-linear rise of the ISC times with increasing mole fractions of methanol and indicate that Rose Bengal in varying solvent mixtures can be used as a model system to study their influence on excited state photophysics.
ASJC Scopus subject areas
- Chemistry(all)
- Physical and Theoretical Chemistry
- Materials Science(all)
- Surfaces, Coatings and Films
- Materials Science(all)
- Materials Chemistry
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In: Journal of Physical Chemistry B, Vol. 128, No. 49, 12.12.2024, p. 12189-12196.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Continuous Tuning of Intersystem Crossing Times in Rose Bengal Water/Methanol Solutions
AU - Strolka, Onno
AU - Rauthe, Pascal
AU - Muschik, Tim
AU - Frech, Philipp
AU - Niebur, André
AU - Unterreiner, Andreas N.
AU - Lauth, Jannika
N1 - Publisher Copyright: © 2024 The Authors. Published by American Chemical Society.
PY - 2024/12/12
Y1 - 2024/12/12
N2 - We use femtosecond transient broadband absorption spectroscopy (TAS) to characterize Rose Bengal in water/methanol solutions and reveal a continuous tunability of intersystem crossing (ISC) times by changing the mole fraction of the solvents. We find that the transients of excited state absorptions (ESAs) in Rose Bengal at ∼430 nm can be attributed to transitions from the singlet state S1, with decay times of 74 ps via ISC in pure water and up to 405 ps in pure methanol. TA measurements at near-infrared wavelengths, on the other hand, reveal the rise of an ESA at ∼1080 nm from the triplet state T1 with time constants of 68 and 491 ps in pure water and methanol, respectively, strongly supporting the associated UV-vis TAS data. Solvent mixtures show a quasi-linear rise of the ISC times with increasing mole fractions of methanol and indicate that Rose Bengal in varying solvent mixtures can be used as a model system to study their influence on excited state photophysics.
AB - We use femtosecond transient broadband absorption spectroscopy (TAS) to characterize Rose Bengal in water/methanol solutions and reveal a continuous tunability of intersystem crossing (ISC) times by changing the mole fraction of the solvents. We find that the transients of excited state absorptions (ESAs) in Rose Bengal at ∼430 nm can be attributed to transitions from the singlet state S1, with decay times of 74 ps via ISC in pure water and up to 405 ps in pure methanol. TA measurements at near-infrared wavelengths, on the other hand, reveal the rise of an ESA at ∼1080 nm from the triplet state T1 with time constants of 68 and 491 ps in pure water and methanol, respectively, strongly supporting the associated UV-vis TAS data. Solvent mixtures show a quasi-linear rise of the ISC times with increasing mole fractions of methanol and indicate that Rose Bengal in varying solvent mixtures can be used as a model system to study their influence on excited state photophysics.
UR - http://www.scopus.com/inward/record.url?scp=85210269939&partnerID=8YFLogxK
U2 - 10.1021/acs.jpcb.4c07449
DO - 10.1021/acs.jpcb.4c07449
M3 - Article
AN - SCOPUS:85210269939
VL - 128
SP - 12189
EP - 12196
JO - Journal of Physical Chemistry B
JF - Journal of Physical Chemistry B
SN - 1520-6106
IS - 49
ER -