Quinolines by Three-Component Reaction: Synthesis and Photophysical Studies

Well-Defined Titanium Complex for Free-Radical and Cationic Photopolymerizations under Visible Light and Photoinduction of Ti-Based Nanoparticles

“…The absorbance maxima of TiQ at 385 nm (ε = 1100 M −1 cm −1 ) and 405 nm (811 M −1 cm −1 ) ensure an interesting overlap with the emission spectra of the LED bulb at 385 and 405 nm. The value of molar absorption coefficient of TiQ is similar to quinoline derivative compounds described by Merlo et al 45 The absorption of TiQ red-shifts with the complexation of the titanium ion in comparison to free quinoline. The steady-state photolysis images of TiQ, TiQ/Iod, and TiQ/Iod/RhB upon 385 nm LED exposure in dry THF and under air are given in Figure 1B−D, respectively.…”

“…According to the studies of other related photoinitiating systems using Iod, the proposed sequence holds true as confirmed by the fluorescence, nanosecond laser flash photolysis, and EPR experiments reported below. Transition absorption spectra of TiQ are displayed in Figure A, and reveal the triplet state 3 TiQ (rr ) at around 440 nm as described for other quinoline derivative compounds . The quenching rate constants of 3 TiQ by oxygen and Iod were evaluated at k q (O 2 ) > 10 9 M –1 s –1 (Figure S4) and k q (Iod) > 10 8 M –1 s –1 (Figure B), respectively.…”

“…Transition absorption spectra of TiQ are displayed in Figure 5A, and reveal the triplet state 3 TiQ (rrr1) at around 440 nm as described for other quinoline derivative compounds. 45 The quenching rate constants of 3 TiQ by oxygen and Iod were evaluated at k q (O 2 ) > 10 9 M −1 s −1 (Figure S4) and k q (Iod) > 10 8 M −1 s −1 (Figure 5B), respectively. According to Figure 5B, the addition of Iod to excited TiQ leads to the formation of a new species absorbing in the visible range (690 nm), which could be attributed to 4-methylphenyliodinium radical cation 66 (MePhI +• ) (rrr3).…”

Synthesis and characterization of 3-aminoquinoline derivatives and studies of photophysicochemical behaviour and antimicrobial activities

“…Spectrophotometric grade DCM solvent was used for the analysis. DCM solvent has a polarity index of 3.1, and two absorptions can be distinguished at 274 and 344 nm for the precursor compound (5), and this is in agreement with data given in the literature [20,21].…”