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- W2010019092 abstract "Two amidothiourea based receptors (L1 and L2) containing a π-acidic 3,5-dinitrophenyl chromophore have been synthesized in good yields and their anion recognition properties were evaluated both in organic and aqueous organic environment by spectroscopic techniques. Anions such as F−, AcO− and H2PO4− were examined to be suitable analytes for the receptor molecules, displaying optical signaling from colorless to orange/red, whereas anions of lower basicity such as Cl−, Br−, I−, NO3− and HSO4− did not cause any discernable spectral changes. The detailed 1H NMR titration experiments and single crystal X-ray structural analyses revealed that the receptor–anion(s) interaction encourages deprotonation of the amide –NH proton of the amidothiourea function. Interestingly, the highly basic OH− ion showed stepwise color changes with increasing equivalents, from colorless to red to green. The step wise color changes were found to be the outcome of OH− (1 equiv.) induced mono-deprotonation of the individual receptors (colorless to red), followed by anion⋯π interaction (red to green) with the π-acidic 3,5-dinitrophenyl ring of the receptors beyond one equiv. of OH− addition. This anion⋯π interaction between the OH− ion and the synthesized receptors has also been confirmed by monitoring the OH− induced absorption spectral changes of a control receptor (LC)." @default.
- W2010019092 created "2016-06-24" @default.
- W2010019092 creator A5038027041 @default.
- W2010019092 creator A5090210230 @default.
- W2010019092 creator A5091649468 @default.
- W2010019092 date "2013-01-01" @default.
- W2010019092 modified "2023-09-23" @default.
- W2010019092 title "Amidothiourea based colorimetric receptors for basic anions: evidence of anion induced deprotonation of amide –NH proton and hydroxide induced anion⋯π interaction with the deprotonated receptors" @default.
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- W2010019092 doi "https://doi.org/10.1039/c3ra23123b" @default.
- W2010019092 hasPublicationYear "2013" @default.
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