Journal
JOURNAL OF FLUORESCENCE
Volume 31, Issue 4, Pages 1075-1083Publisher
SPRINGER/PLENUM PUBLISHERS
DOI: 10.1007/s10895-021-02745-w
Keywords
Fluorescence; Calix[4]arene; Cobalt; Benzothiazin
Funding
- Research Foundation of Selcuk University [18201144]
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In this study, a new calixarene-based chromophore compound was synthesized with Co2+ selectivity and fluorescence switched-off behavior. The binding constant was found to be relatively high, while the detection limit for Co2+ ion was low.
Calixarenes, which have a great place in supramolecular chemistry, have become the most prominent macrocyclic compounds in synthetic organic chemistry due to their easy synthesis and functionalization. In this study, p-tert-butyl calix[4]arene dihydrazide derivative was synthesized and then reacted with 3-oxo-3,4-dihydro-2 H-benzo[b][1,4] thiazin-2-ylideneacetyl chloride to prepare new calixarene based chromophore compound 4. The structure of the synthesized compound was elucidated by spectroscopic methods such as H-1 NMR C-13 NMR and FT-IR spectroscopy. Chromogenic and fluorescence properties of compound 4 were evaluated. It was observed from both studies that compound 4 was Co2+ selective and shows fluorescence Switched-off behavior. Stoichiometry, binding constant and the detection limit were calculated. The stoichiometry between compound 4 and Co2+ was found to be 1:1. The binding constant value (K) was calculated as 666.67 M- 1 using Benesi-Hildebrand equation, while the detection limit for Co2+ ion was calculated as 0.0465 mu M.
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