Novel ESIPT fluorescent benzazolyl-4-quinolones: Synthesis, spectroscopic characterization and photophysical properties

Synthesis and Antimicrobial Evaluation of Novel Polyfused Heterocycles‐Based Quinolone

“…Annulation of 10 by refluxing of compound 10 with hydrazine hydrate in glacial acetic acid yielded indolo[3′,2′:5,6]pyridazino[4,3‐ c ]quinolinone 11 . In a similar manner, Claisen–Schmidt condensation of 1 with p ‐hydroxy‐ o ‐methoxybenzaldehyde in dimethylformamide containing a catalytic amount of piperidine afforded α,β‐unsaturated ketone 12 , which reacts with p ‐phenylenediamine in dimethylformamide to yield dibenzo[ b , h ]naphthyridinone 13 (Scheme ). The newly synthesized compounds were elucidated on the basis of elemental analyses and spectral data (C.f.…”

“…Quinolone systems are well‐known substances with great therapeutic importance, particularly in the treatment of viral , HIV , bacterial, for example, Ciprofloxacin and Norfloracin (Figure ) , cancer , malarial , microbial , and leishmanial diseases. They are also known as photo proliferative .…”

Towards NIR‐Active Hydroxybenzazole (HBX)‐Based ESIPT Motifs: A Recent Research Trend

“…In 2004, Park and co‐workers have synthesized conjugative electron acceptors derivatives of HBO VR‐2 and VR‐3 by Knoevenagel condensation of formyl derivatives of HBO at F position ( see Figure ) with active methylene group which exhibit keto emission in the red region around 625 nm due to creation of intramolecular charge transfer (ICT) state after ESIPT process. In 2010, Stefani et al have modified 5‐amino HBO and HBT to synthesize VR‐4 and VR‐5 which exhibit emission at 597 nm and 638 nm respectively . In 2011, Wang et al have modified the 4‐amino and 5‐amino HBT to synthesized six HBT derivatives with different donor substituents i. e. dimethyl, diphenyl, and carbazole.…”

Solvent Relaxation Accompanied Ultrafast Excited State Proton Transfer Dynamics Revealed in a Salicylideneaniline Derivative

“…The process, ESIPT, has been observed in derivatives of large class of molecules such as flavone, anthraquinone, quinolones, di and tri azoles, etc ,. In these molecules, the conversion of enol to keto form can vary depending on the medium and timescale of proton transfer process in the excited state.…”