125049-95-8Relevant articles and documents
A 4-tert-butylcalix[4]arene tetrahydroxamate podand based on the 1-oxypiperidine-2-one (1,2-PIPO-) chelate. Self-assembly into a supramolecular ionophore driven by coordination of tetravalent zirconium or hafnium(iv)
Jewula, Pawel,Chambron, Jean-Claude,Penouilh, Marie-Jose,Rousselin, Yoann,Meyer, Michel
, p. 22743 - 22754 (2014/06/23)
An octadentate tetrahydroxamic calix[4]arene podand incorporating 1-hydroxypiperidine-2-one (1,2-PIPOH) binding units has been designed as a specific chelator for tetravalent metal cations like Zr4+ or Hf 4+. This receptor, which can be considered as the first ever abiotic ligand possessing only cyclic six-membered hydroxamate groups, has been synthesized and characterized in its tetraprotonated form (1H4). Contrary to expectation, however, this new chelator did not form a 1:1 complex upon reaction with M(acac)4 (M = Zr and Hf; acac = acetylacetonate), but rather self-assembled into a dimeric species of 2:2 stoichiometry. The latter could be characterized in solution by mass spectrometry and NMR spectroscopy as its monopotassium adduct ([M2K(1)2] +), pointing to the ionophoric character of the M2(1) 2 complex. This journal is the Partner Organisations 2014.