Selective Cation Recognition by p-Tetranitrocalix[4]arene

Imam Bakhsh Solangi; Ashfaque Ali Bhatti; Mansoor Ahmed Qazi; Shahabuddin Memon; M. I. Bhanger

doi:10.21743/

Authors

Imam Bakhsh Solangi National Centre of Excellence in Analytical Chemistry, University of Sindh, Jamshoro 76080, Pakistan Author
Ashfaque Ali Bhatti National Centre of Excellence in Analytical Chemistry, University of Sindh, Jamshoro 76080, Pakistan Author
Mansoor Ahmed Qazi National Centre of Excellence in Analytical Chemistry, University of Sindh, Jamshoro 76080, Pakistan Author
Shahabuddin Memon National Centre of Excellence in Analytical Chemistry, University of Sindh, Jamshoro 76080, Pakistan Author
M. I. Bhanger National Centre of Excellence in Analytical Chemistry, University of Sindh, Jamshoro 76080, Pakistan Author

DOI:

https://doi.org/10.21743/

Keywords:

Macromolecule; Solvatochromic features; Binding affinity; Metal ions; Non-covalent chemistry.

Abstract

The present study explores the copper selective complexation character of 5,11,17,23-tetranitro-25,26,27,28-tetrahydroxycalix[4]arene (p-TNC4) among a series of different alkali, alkaline earth and transition metal ions, i.e. Li+, Na+, K⁺,Cs⁺ Mg²⁺, Ba²⁺, Hg²⁺, Cd²⁺, Pb²⁺, Co²⁺ Ni²⁺ and Zn²⁺ using absorption spectroscopic technique. p-TNC4 shows pronounced discriminative specificity towards Cu²⁺ even the interference study of other co-existing ions also proved this selectivity. Furthermore, the solvatochromic effect, effect of acid (acetic acid), alkali (piperidine) on spectra, response time measurement and the stability of p-TNC4-Cu²⁺ complex in MeCN has also been investigated. The stoichiometric analysis (i.e. Jobs plot) reveals that p-TNC4 forms 1:1 host-guest complex with Cu²⁺.