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• W2010978920 abstract "In this study, a novel chromogenic receptor, 1-(naphthalen-1-yl)-3-(9-oxo-9H-fluoren-1-yl)urea (1), utilizing fluorenone and naphthalene moieties as signaling groups was designed and synthesized. The interaction and colorimetric sensing properties of receptor 1 with different anions were investigated by the naked eye, as well as UV‐visible and fluorescence spectroscopy. The addition of 100 equiv. of fluoride and pyrophosphate as tetrabutylammonium salts to 1.25 × 10− 4 M CH3CN:DMSO (9:1, v/v) solution mixture of receptor 1 produced a wine-red color. The oxoanions and a variety of other anions were not capable of producing any significant color change with receptor 1 under similar experimental conditions. The corresponding UV‐vis measurements showed a bathochromic shift of the 395 nm band of receptor 1 to ~ 500 nm for fluoride and pyrophosphate. Fluorescence emission changes indicate clearly that receptor 1 behaves like an ideal photo-induced electron transfer (PET) sensor upon complexation with anions. The limit of detection (LOD) of the sensor 1 is calculated to be ca. 250 and 110 nM for F− and HP2O73−, respectively. The 1H NMR titration studies shed further light on their mode of binding with receptor 1. The quantum mechanical calculations through time dependant density functional theory (TD-DFT) using basis set B3P86/TZVP support our experimental findings with a good agreement." @default.
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• W2010978920 date "2013-01-01" @default.
• W2010978920 modified "2023-10-18" @default.
• W2010978920 title "A novel colorimetric and fluorescent sensor for fluoride and pyrophosphate based on fluorenone signaling units" @default.
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• W2010978920 doi "https://doi.org/10.1016/j.microc.2012.04.012" @default.
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