Deciphering the excited state intramolecular charge-coupled double proton transfer in an asymmetric quinoline–benzimidazole system

Abstract

8-(1H-Benzo[d]imidazol-2-yl) quinolin-7-ol (HQB) has structural asymmetry and encloses double hydrogen bonds (HBs), which undergo excited state intramolecular charge transfer and double proton transfer (ESICT/ESIDPT). The HQB exhibits three absorption peaks...

Tuning ESIPT-coupled luminescence by expanding π-conjugation of a proton acceptor moiety in ESIPT-capable zinc(ii) complexes with 1-hydroxy-1H-imidazole-based ligands

“…However, the quinoline moiety is only rarely involved in the design and theoretical studies of ESIPT-capable molecules. [139][140][141][142][143][144][145][146][147][148][149][150][151][152][153][154][155][156] What is important for coordination chemistry in the case of HL q is that this new ESIPT-system still features a metal binding site and can be used for the synthesis of ESIPT-capable metal complexes as its predecessor HL p is. Finally, since ESIPT-fluorophores tend to luminesce with low quantum yields resulting from significant structural reorganization accompanying the ESIPT process, a natural choice for improving their efficiency through chelation-enhanced fluorescence (CHEF) seems to be Zn 2+ ion.…”

Killing two birds with one stone: phosphorylation by a tabun mimic and subsequent capture of cyanide using a single fluorescent chemodosimeter

“…The high-energy emission was calculated to have τ = 0.81 ns (4%) and 1.57 ns (96%) whereas the low-energy emission gave τ = 0.25 ns (36%) and 1.6 ns (64%) (Table S2, ESI†). 29…”

“…The high-energy emission was calculated to have t = 0.81 ns (4%) and 1.57 ns (96%) whereas the low-energy emission gave t = 0.25 ns (36%) and 1.6 ns (64%) (Table S2, ESI †). 29 The next step was to form the ketoximate through the addition of base. Here, a non-nucleophilic base was required to abstract the proton from the oxime moiety without itself undergoing nucleophilic addition to the organophosphate.…”

Investigation of the Optical Properties of a Novel Class of Quinoline Derivatives and Their Random Laser Properties Using ZnO Nanoparticles

“…All simulations were accomplished with Avogadro, Marvin Sketch, and Gaussian 16 program package [ 33 ] at King Saud University using a workstation equipped with AMD Ryzen 9 3950X 16-core, 32-Thread, 128 GB RAM, 1 TB M.2 SSD, with an FORTRAN emulator. The B3LYP method with basis set 6–31G* was used for all time-dependent DFT (TDDFT) and density functional theory (DFT) calculation of imino quinolines [ 34 , 35 ].…”