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New lower rim looped calix[4]arene for ratiometric and chromogenic recognition of Cu2+ |
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| Authors: | Har Mohindra Chawla Preeti Goel Richa Shukla David StC Black Naresh Kumar |
| Institution: | 1. Department of Chemistry, Indian Institute of Technology Delhi, Hauz Khas, New Delhi, 110016, India 2. School of Chemistry, The University of New South Wales (UNSW), Sydney, NSW, Australia |
| Abstract: | A new calix4]arene derivative in its cone conformation and bearing Schiff base loop at the lower rim has been synthesized and evaluated as a specific molecular probe for copper ions. The new molecular receptor 4 shows a selective visible change in color from colorless to yellow only in the presence of Cu2+ ions which was confirmed by a significant bathochromic shift (?λmax = 76 nm) in its absorption spectrum. The stoichiometry of the copper complex was calculated to be 1:1. These results may help to design more efficient chemical sensors for determining copper in biological systems. |
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