NDLI: 5-(1H-Indol-3-yl)-pyrazolyl derivatives as colorimetric sensor for anions

Content Provider	Springer Nature Link
Author	Ahmad, Israr Mishra, Neeraj Kumar Ghosh, Tamal
Copyright Year	2012
Abstract	The synthesis, characterisation and binding and deprotonation studies with anions for four 5-(1H-indol-3-yl)-pyrazolyl derivatives (2–5) have been described. It is worthy to mention that sensor 2 shows a drastic change in absorption spectrum (ca. 335 nm) and colour (colourless to blue) upon addition of F$^{−}$ in DMSO solution due to the deprotonation of indole –NH proton, as confirmed by $^{1}$H NMR titration. Sensor 4 recognizes F$^{−}$ and CN$^{−}$ ions by deprotonation mechanism with visible colour change of the solution in a similar manner to that of 2. However, in contrary to 2 and 4, sensor 3 binds with F$^{−}$, CN$^{−}$, H$_{2}$PO$_{4}$ $^{−}$, AcO$^{−}$ and PhCOO$^{−}$ ions exploiting hydrogen-bonding interaction with the shifting of absorption band to longer wavelength and subsequent colour change of the solution. Compound 5 recognizes F$^{−}$ without any visual colour change and its binding is studied by $^{1}$H NMR titration to acquire the important information about the nature of binding between F$^{−}$ and 5.
Starting Page	183
Ending Page	191
Page Count	9
File Format	PDF
ISSN	09230750
Journal	Journal of Inclusion Phenomena and Macrocyclic Chemistry
Volume Number	76
Issue Number	1-2
e-ISSN	15731111
Language	English
Publisher	Springer Netherlands
Publisher Date	2012-06-20
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Indolyl-pyrazolyl derivatives Colorimetric anion sensors Deprotonation Hydrogen-bond Organic Chemistry Food Science Crystallography
Content Type	Text
Resource Type	Article
Subject	Chemistry Condensed Matter Physics Food Science

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4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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