Internal conversion of o-aminoacetophenone in solution

LIF excitation spectra for S0→S1 transition of deuterated anthranilic acid COOD, ND2 in supersonic-jet expansion

“…The REMPI and ZEKE supersonic jet spectra of anthranilic acid [4] and its complexes [5,6] with water molecules were reported by He et al and Wu et al The ab initio, DFT and TD-DFT calculations indicate that the magnitude of the hydrogen atom displacement in the S 1 state of anthranilic acid is significantly smaller [7] than that in salicylic acid. This is consistent with the experimental studies of anthranilic acid and its derivatives [8][9][10][11][12], which did not reveal symptoms of hydrogen atom transfer.…”

Heterocyclic Quinol‐Type Fluorophores: Synthesis, X‐ray Crystal Structures, and Solid‐State Photophysical Properties of Novel 5‐Hydroxy‐5‐substituent‐benzo[b]naphtho[1,2‐d]furan‐6‐one and 3‐Hydroxy‐3‐substituent‐benzo[kl]xanthen‐2‐one Derivatives

“…Similar fluorescence characteristics were previously reported in some aromatic carbonyl compounds such as pyrene-3-carboxaldehyde, [11] 7-alkoxycoumarins, [12] and o-aminoacetophenone. [13] Spectroscopic properties of 4 a-c and 5 a-c in the solid state: Interesting results have been obtained from the photophysical properties of crystalline 4 a-c and 5 a-c. Figure 1 shows that the optical properties of quinols 4 a-c and 5 a-c are quite different between the solution and the solid state. Crystals of 4 c exhibit strong greenish-yellow fluorescence emission, but the crystals of 4 a and 4 b exhibit yellowishorange and green fluorescence emission, respectively.…”

Substituent effects on ultrafast excited-state proton transfer of protonated aniline derivatives in aqueous solution

“…Fluorescence lifetimes were measured by using a picosecond-laser system [21] which was based on a mode-locked Ti:Sapphire laser (Spectra-Physics, Tsunami; 800 nm, FWHM $70 fs, at 80 MHz) pumped by a CW green laser (Spectra-Physics, Millennia V; 532 nm, 4.5 W). The repetition rate was adjusted to 4 MHz by using a pulse-picker, and the third harmonic (266 nm, FWHM $250 fs) was used for the excitation source.…”