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Lanthanoid Complexation by a Tris‐Tetrazole‐Functionalised Calix[4]arene
Author(s) -
D'Alessio Daniel,
Skelton Brian W.,
Sobolev Alexandre N.,
KrauseHeuer Anwen M.,
Fraser Benjamin H.,
Massi Massimiliano,
Ogden Mark I.
Publication year - 2016
Publication title -
european journal of inorganic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.667
H-Index - 136
eISSN - 1099-0682
pISSN - 1434-1948
DOI - 10.1002/ejic.201600938
Subject(s) - calixarene , chemistry , tetrazole , tris , denticity , lanthanide , terbium , ligand (biochemistry) , inorganic chemistry , metal , polymer chemistry , organic chemistry , molecule , ion , biochemistry , receptor
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.