Fluorescent photochromic complex of 1,8-naphthalimide derivative and benzopyrane containing benzo-18-crown-6 ether
作者:O.A. Fedorova、A.N. Arkhipova、P.A. Panchenko、J. Berthet、S. Delbaere、S. Minkovska、Yu. V. Fedorov
DOI:10.1016/j.jphotochem.2020.112975
日期:2021.1
We present here design, preparation, characterization, and properties of a photochromic supramolecular complex of benzopyran containing benzo-18-crown-6-ether 1 with 4-aminonaphthalimide 2 as a fluorophore. Phototransformation of the supramolecular complex 1⋅2 is accompanied by the appearance of a predominantly open TC form, which is consistent with the monoexponential bleaching curve of an open form
In this work, the interaction of protonated amino acids with a chromene bearing a fused 18-crown-6 ether moiety was studied by UV–vis and NMR spectroscopy. Initial closed forms of the chromene form monotopic 1 : 1 complexes, the ammonium group being localized inside the crown ether cavity. UV-irradiation leads to transformation of the ring-closed species into the ring-opened form. Depending on the amino acid length, either ditopic or monotopic 1 : 1 complexes are formed. Such complexes are stabilized by the additional H-bonding between the carboxylic group of the acid and the carbonyl oxygen atom of the ring-opened form. Cessation of the irradiation results in ring-closure to the chromene with concomitant change of the complexation mode.
Synthesis, metal ion binding, and photochromic properties of benzo- and naphthopyrans annelated by crown ether moieties
作者:Sergey V. Paramonov、Vladimir Lokshin、Artem B. Smolentsev、Evgeni M. Glebov、Valeri V. Korolev、Stepan S. Basok、Konstantin A. Lysenko、Stéphanie Delbaere、Olga A. Fedorova
DOI:10.1016/j.tet.2012.07.029
日期:2012.9
Combining a photochromic chromene with a crown ether moiety results in systems in which photochromism and ionophoric properties could significantly influence each other. In this paper, we report the synthesis of several chromenes annelated by 15(18)-crown-5(6) ethers. The approach involves the building of the photochromic fragment upon the initial crown ether via phenols. The two main routes for chromene