Vibrationally Resolved Absorption, Fluorescence, and Preresonance Raman Spectroscopy of Isolated Pyronin Y Cation at 5 K.
Sreekanta DebnathAlexander SchäferShun ItoDmitry StrelnikovRabea SchneiderKarolina Anna HaupaManfred M KappesPublished in: The journal of physical chemistry letters (2023)
Exploring how charge-changing affects the photoluminescence of small organic dyes presents challenges. Here, helium tagging photodissociation (PD) action spectroscopy in the gas phase and dispersed laser-induced fluorescence (DF) spectroscopy in the solid Ne matrix are used to compare the intrinsic photophysical properties of pyronin Y cation [PY] + and its one electron-reduced neutral radical [PY] • at 5 K. Whereas the cation shows efficient visible photoluminescence, no emission from the neutral, in line with theoretical predictions, was detected. B3LYP/aug-cc-pVDZ calculations based on the TD-DFT/FCHT method allow for unambiguous assignment of recorded vibrationally resolved absorption and emission spectra. Surprisingly, our experimental sensitivity was high enough to also observe electronic preresonance Raman (ePR-Raman) spectra of [PY] + , with a significant efficiency factor (EF). These characteristics of the [PY] • /[PY] + pair suggest that appropriately functionalized derivatives may open new perspectives in the area of in vivo bioimagining microscopy and find applications in various sophisticated stimulated-Raman spectroscopies.
Keyphrases
- raman spectroscopy
- single molecule
- density functional theory
- quantum dots
- energy transfer
- high resolution
- ionic liquid
- solid state
- label free
- molecular dynamics
- minimally invasive
- high speed
- high throughput
- optical coherence tomography
- mass spectrometry
- water soluble
- molecularly imprinted
- crystal structure
- liquid chromatography
- simultaneous determination
- solid phase extraction
- electron transfer