Browsing by Subject "INTRAMOLECULAR CHARGE-TRANSFER"

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    Fluorene Based Ferric Complex as Colorimetric and Fluorometric Probe for Highly Selective Detection of CN- and S2- Anions
    (SPRINGER/PLENUM PUBLISHERS) Saltan, GM; Dinçalp, H
    A series of new chemosensor molecules bearing benzothiazole-, quinoline- and phthalazine-functionalized fluorene derivatives were synthesized and their complexation behaviors with Fe3+ and Sn2+ ions were investigated. The sensing abilities of their complexes towards both cyanide and sulfide anions were investigated by colorimetric and fluorometric techniques in detail. The sensing mechanism was investigated by Job's and Scatchard plots evaluations, and also absorption/fluorescence titration experiments. Among the studied dye/metal binary systems, F-BT sensor to Fe3+ giving the detection limits of 3.1 mu g has also displayed high selectivity and sensitivity towards CN- and S2- anions, lead to a significant color change of the solution observable by the naked eye.
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    Sensing behaviours to Fe3+, Co2+ ions and cyanide detection performance of 4,5-diazafluorene-based colorimetric chemosensors
    (INDIAN ACAD SCIENCES) Saltan, GM
    Three novel colorimetric chemosensors were synthesized by Schiff base condensation of 4,5-diazafluoren-9-one with different hydrazine derivatives, which included benzothiazole (DAF-BT), quinoline (DAF-QU) and phthalazine groups (DAF-PHT). Structural characterization was supported by Fourier transform infrared spectroscopy, and nuclear magnetic spectroscopy (H-1-NMR and C-13-NMR) analyses. Photophysical properties of colorimetric chemosensors synthesized in the study were investigated systematically in different solvents of polarities such as chloroform, dichloromethane, acetonitrile, and then their sensing probe activities mainly with Fe+3 and Co+2 ions were evaluated using UV-vis absorption and fluorescence emission spectroscopy. DAF-PHT, DAF-QU and DAF-BT chemosensors absorption maxima between 424 and 492 nm were associated with the intramolecular charge transfer transitions, and metal sensing abilities were also supported by the formation of metal-to-ligand charge transfer transitions. One of the studied complex, sensor DAF-PHT/Co2+, showed highly selective to CN- anion in acetonitrile solution and colour changes could be detected with the naked eye.