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A Bis(Boronic Ester)‐Based Fluorogenic and Chromogenic Sensor for F – and Cu 2+
Author(s) -
Maity Dinesh,
Hari Nairita,
Mohanta Sasankasekhar
Publication year - 2017
Publication title -
chemistryselect
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.437
H-Index - 34
ISSN - 2365-6549
DOI - 10.1002/slct.201700891
Subject(s) - chemistry , boronic acid , titration , proton nmr , chromogenic , absorption (acoustics) , absorption spectroscopy , spectroscopy , picric acid , analytical chemistry (journal) , stereochemistry , organic chemistry , materials science , chromatography , physics , quantum mechanics , composite material
In this work, we designed a new boronic ester based ditopic Schiff's base receptor, 2,2′‐(((1E,1′E)‐((2,4,8,10‐tetraoxa‐3,9‐diboraspiro[5.5]undecane‐3,9‐diyl)bis(4,1‐phenylene)) bis(me‐thanylylidene))bis(azanylylidene))diphenol (H 2 L)by condensing ortho ‐aminophenol, 4‐formyl phenyl boronic acid and pentaerythritol. The receptor has been thoroughly characterized by 1 H, 13 C, 11 B NMR spectroscopy as well as high resolution mass spectroscopy and by elemental analyses. Hydrolytic stability of the receptor was also checked by recording its 1 H NMR spectrum in mixed DMSO‐ d 6 and D 2 O solvent. The receptor acts as highly selective and sensitive probe for the detection of Cu 2+ and F – among the studied ions in solution. Both anion and cation sensing studies were thoroughly investigated through multiple optical channels such as UV‐vis absorption and steady state and time‐resolved emission spectroscopic techniques. Among the studied anions, only F – induces color and absorption and emission and time‐resolved emission spectral changes in dimethylsulphoxide.Addition of Cu 2+ ion to the solution of the receptor in dimethylsulfoxide‐water (5:2 v/v) leads to remarkable color and absorption spectral changes. Association constants of the receptor towards F – have been also evaluated from the absorption/emission titration data.