TY - JOUR
T1 - Lanthanoid Complexation by a Tris-Tetrazole-Functionalised Calix[4]arene
AU - D'Alessio, D.
AU - Skelton, Brian W.
AU - Sobolev, Alexandre N.
AU - Krause-Heuer, A.M.
AU - Fraser, B.H.
AU - Massi, M.
AU - Ogden, Mark I.
PY - 2016/12
Y1 - 2016/12
N2 - © 2016 WILEY-VCH Verlag GmbH & Co. KGaA, WeinheimThe 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.
AB - © 2016 WILEY-VCH Verlag GmbH & Co. KGaA, WeinheimThe 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.
U2 - 10.1002/ejic.201600938
DO - 10.1002/ejic.201600938
M3 - Article
SN - 1434-1948
VL - 2016
SP - 5366
EP - 5372
JO - European Journal of Inorganic Chemistry
JF - European Journal of Inorganic Chemistry
IS - 34
ER -