Issue 15, 2014

p-tert-Butylcalix[6]arene hexacarboxylic acid conformational switching and octahedral coordination with Pb(ii) and Sr(ii)

Abstract

p-tert-Butylcalix[6]arene hexaacetic acid is in a symmetric cone conformation in CHCl3, but it becomes conformationally flexible in CHCl3/CH3CN (1 : 1). In this mixture the host has a strong binding affinity towards Pb(II) and instantly forms a complex of low symmetry – shortly thereafter structural reorganization occurs resulting in a high symmetry complex of Pb(II) in an octahedral cage of carboxylates. Sr(II) and Ba(II) display similar behavior over a longer period of time.

Graphical abstract: p-tert-Butylcalix[6]arene hexacarboxylic acid conformational switching and octahedral coordination with Pb(ii) and Sr(ii)

Supplementary files

Article information

Article type
Communication
Submitted
05 Nov 2013
Accepted
24 Dec 2013
First published
03 Jan 2014

Chem. Commun., 2014,50, 1903-1905

p-tert-Butylcalix[6]arene hexacarboxylic acid conformational switching and octahedral coordination with Pb(II) and Sr(II)

B. B. Adhikari, K. Ohto and M. P. Schramm, Chem. Commun., 2014, 50, 1903 DOI: 10.1039/C3CC48465C

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