An article Proton-induced fluorescence in modified quino[7,8-h]quinolines: dual sensing for protons and pi-donors WOS:000486038900022 published article about HYDROGEN-BONDS; H-BOND; SPONGES; COMPLEXES; QUINOLINE; GEOMETRY; CRYSTAL; ANALOGS; CLUSTER in [Pozharskii, Alexander F.; Ozeryanskii, Valery A.; Mikshiev, Vladimir Y.; Antonov, Alexander S.] Southern Fed Univ, Dept Organ Chem, Zorge Str 7, Rostov Na Donu 344090, Russia; [Chernyshev, Anatoly, V; Metelitsa, Anatoly, V] Southern Fed Univ, Inst Phys & Organ Chem, Stachki Ave 194-2, Rostov Na Donu 344090, Russia; [Mikshiev, Vladimir Y.; Antonov, Alexander S.] St Petersburg State Univ, Inst Chem, Univ Skii Pr 26, St Petersburg 198509, Russia in 2019, Cited 59. The Name is 1,3-Dimethoxybenzene. Through research, I have a further understanding and discovery of 151-10-0. HPLC of Formula: C8H10O2
The synthesis, as well as spectral, structural and photoluminescence properties of dipyrido[3,2-e:2 ‘,3 ‘-h]acenaphthene 5 and quinazolino[7,8-h]quinazolines 6 as representatives of the bidentate -N=/-N= superbases, are reported. These nitrogen bases being more rigid (5) or pi-extended (6) analogs of optically-mute quino[7,8-h]quinoline are both active in terms of fluorescence with quantum yields up to phi = 0.71-0.77. At the same time, their luminescence behavior is opposite to that of peri-NMe2/NMe2 naphthalene proton sponges and their hybrid NMe2/-NMe2 analogs. Although 5 and 6 exhibit visible region emission upon protonation, for the hybrid systems the fluorescence is manifested only for bases. The most remarkable observation is that the fluorescence of compound 5 can be switched on not only by means of organic or inorganic acids, but also through the formation of chelate complexes with such weak H-donors as water and primary alcohols. It was disclosed that water is present in the complex as a cluster comprising 8 interconnected H2O molecules. Overall, the studied compounds demonstrate a previously unobserved type of dual mode optical response, H-sensing (emission enhancement in 5 and 6 on protonation) and pi-sensing (emission quenching in 5H(+) and 6H(+) on coordination with pi-donors). This work seems to be an important contribution to areas such as chemosensorics, the creation of new ligands, hydrogen transfer and some other phenomena representing different types of supramolecular interactions.
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Reference:
Isothiazole – Wikipedia,
,Isothiazole – ScienceDirect.com