Femtosecond Spectroscopy and Nonlinear Optical Properties of aza-BODIPY Derivatives in Solution.
Hao-Jung ChangMykhailo V BondarNatalia MuneraSylvain DavidOlivier MauryGerard BergincBoris Le GuennicDenis JacqueminChantal AndraudDavid J HaganEric W Van StrylandPublished in: Chemistry (Weinheim an der Bergstrasse, Germany) (2022)
The fast relaxation processes in the excited electronic states of functionalized aza-boron-dipyrromethene (aza-BODIPY) derivatives (1-4) were investigated in liquid media at room temperature, including the linear photophysical, photochemical, and nonlinear optical (NLO) properties. Optical gain was revealed for nonfluorescent derivatives 3 and 4 in the near infrared (NIR) spectral range under femtosecond excitation. The values of two-photon absorption (2PA) and excited-state absorption (ESA) cross-sections were obtained for 1-4 in dichloromethane using femtosecond Z-scans, and the role of bromine substituents in the molecular structures of 2 and 4 is discussed. The nature of the excited states involved in electronic transitions of these dyes was investigated using quantum-chemical TD-DFT calculations, and the obtained spectral parameters are in reasonable agreement with the experimental data. Significant 2PA (maxima cross-sections ∼2000 GM), and large ESA cross-sections ∼10 -20 m 2 of these new aza-BODIPY derivatives 1-4 along with their measured high photostability reveal their potential for photonic applications in general and optical limiting in particular.
Keyphrases
- high resolution
- living cells
- room temperature
- fluorescent probe
- high speed
- single molecule
- atomic force microscopy
- energy transfer
- ionic liquid
- optical coherence tomography
- structure activity relationship
- density functional theory
- molecular dynamics
- computed tomography
- machine learning
- electronic health record
- dual energy
- genome wide
- quantum dots
- molecularly imprinted
- neural network
- liquid chromatography