Uranyl ion complexation by medium and large homooxacalixarenes: from mono- to poly-uranate complexes
Abstract
Crystal structures of dioxouranium(VI) complexes of three homooxacalix[n]arenes (n = 4, 6 or 8) have shown the possibility to complex metal moieties of variable nuclearity, depending upon the number of phenolic groups and ether links they contain. p-tert-Butyltetrahomodioxacalix[6]arene embraces a single uranyl unit through tetraphenoxide coordination as commonly observed in