Lanthanoid Complexation by a Tris-Tetrazole-Functionalised Calix[4]arene

D. D'Alessio, Brian W. Skelton, Alexandre N. Sobolev, A.M. Krause-Heuer, B.H. Fraser, M. Massi, Mark I. Ogden

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4 Citations (Scopus)


© 2016 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim

The synthesis and characterization of 5,11,17,23-tetra-tert-butyl-25-hydroxy-26,27,28-tris(tetrazol-5-ylmethoxy)calix[4]arene is reported. Purification of the macrocycle required the use of preparative HPLC techniques. The macrocycle was found to be a poorer ligand for complexation of lanthanoid cations than the bis(tetrazole) analogue, but somewhat more effective than the tetrakis(tetrazole)-substituted derivative. Two metal complexes of the tris(tetrazole)–calixarene were structurally characterised. A polymeric sodium salt of the tris(tetrazole)–calixarene was isolated from a solution containing yttrium and a sodium acetate buffer. A praseodymium complex was isolated in the presence of an ammonium acetate buffer, where the calixarene acts as a unidentate ligand, bound to the metal atom through one tetrazole N-atom. Increasing the amount of buffer resulted in the crystallisation of a metal-free ammonium salt of the calixarene.

Original languageEnglish
Pages (from-to)5366-5372
Number of pages7
JournalEuropean Journal of Inorganic Chemistry
Issue number34
Early online date28 Oct 2016
Publication statusPublished - Dec 2016


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