Macroscopic recognition of iodide by polymer appended calix[4]amidocrown resin. Issue 9 (2nd September 2019)

• Record Type: Journal Article
• Authors: Sharma, Pragati R; Pandey, Shubham; Soni, Vineet K; Choudhary, Ganpat; Sharma, Rakesh K
• Is Part Of: Supramolecular chemistry. Volume 31:Issue 9(2019)
• Page Start: 634
• Page End: 644
• Publication Date: 2019-09-02
• Subjects: Calixarene -- chemosensor -- conductometric -- Benesi-Hildebrand plots -- inclusion complex -- iodide; Macromolecules -- Periodicals; Supramolecular chemistry -- Periodicals; 547.005
• DOI: 10.1080/10610278.2019.1676425
• Languages: English
• ISSNs: 1061-0278

Abstract

ABSTRACT: The current study reveals the synthesis of polymer appended Calix[4]amidocrown-5 with specific binding affinity for iodide at ppm-level. The low detection limits are observed via UV-vis and fluorescence spectroscopy. The time-dependent solution and solid-state 127 I NMR studies with 18.8 and 19 ppm shifts, indicate a strong sensing nature of resin towards iodide ion. A significant reduction in surface area and pore volume with higher thermostability of resin after iodide uptake indicated iodide inclusion in the amidocrown cavity. The mechanism of iodide sensing may be governed by noncovalent interactions of NH and OH protons present in amidocrown and phenyl ring as observed in terms of emission enhancement in fluorescence spectroscopy. The binding affinity and stoichiometric determinations are determined by Benesi-Hildebrand and Jobs plots, respectively. Graphical abstract: