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- Title
Lanthanoid Complexation by a Tris-Tetrazole-Functionalised Calix[4]arene.
- Authors
D'Alessio, Daniel; Skelton, Brian W.; Sobolev, Alexandre N.; Krause‐Heuer, Anwen M.; Fraser, Benjamin H.; Massi, Massimiliano; Ogden, Mark I.
- Abstract
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.
- Subjects
RARE earth metals; COMPLEXATION reactions; AROMATIC compound synthesis; MACROCYCLIC compounds; HIGH performance liquid chromatography
- Publication
European Journal of Inorganic Chemistry, 2016, Vol 2016, Issue 34, p5366
- ISSN
1434-1948
- Publication type
Article
- DOI
10.1002/ejic.201600938