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A Solvent‐dependent Fluorogenic Probe Containing Julolidine for Cr( III ) and Cu( II )
Author(s) -
Anjong Tikum Florence,
Park Yu Mi,
Jang Ha Yoon,
Kim Jinheung
Publication year - 2016
Publication title -
bulletin of the korean chemical society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.237
H-Index - 59
ISSN - 1229-5949
DOI - 10.1002/bkcs.10800
Subject(s) - chemistry , titration , fluorescence , acetonitrile , absorption (acoustics) , metal ions in aqueous solution , metal , analytical chemistry (journal) , photochemistry , inorganic chemistry , ion , nuclear chemistry , materials science , organic chemistry , physics , quantum mechanics , composite material
A julolidine‐containing naphthylamine probe ( EW1 ) was prepared for sensing specific metal ions. Probe EW1 afforded a broad low fluorescence at 500–600 nm in acetonitrile, but gave a relatively stronger fluorescence at 540 nm in methanol. EW1 showed a selective turn‐on emission for Cr 3+ in CH 3 CN . Upon treatment with Cr 3+ , a strong emission was observed at 515 nm, but other metal ions, such as K + , Ag + , Ca 2+ , Zn 2+ , Co 2+ , Ni 2+ , Cu 2+ , Cd 2+ , Hg 2+ , Fe 2+ , and Fe 3+ , failed to induce such an emission band. A clean isosbestic point appeared at 405 nm in the UV –vis titration with Cr 3+ . The emission intensity of EW1 was enhanced with incremental addition of Cr 3+ , indicating the formation of a 1:1 complex of the probe EW1 and chromium ion. However, EW1 showed a selective turn‐off response with Cu 2+ in CH 3 OH . The emission band of EW1 at 540 nm was quenched only with Cu 2+ and not with other control metal ions. The absorption band of EW1 at 410 nm progressively decreased, and a new absorption at 390 nm appeared upon progressive addition of Cu 2+ . All spectroscopic titration experiments and ESI mass data provided evidence for the formation of a 1:1 complex between EW1 and Cu 2+ .