Dioxouranium(VI) complexes with N-salicylsalicylaldimines and their Lewis base adducts

Abstract

New dioxouranium(VI) complexes with the dibasic terdentate Schiff bases, XC₆H₃(2-OH)CH=N-CH₂C₆H₄(2?-OH) (X = H, 5-Cl or 3-MeO), have been synthesized and characterized as their 1 : 1 alcohol adducts. The labile alcohol molecules in these complexes are readily replaced by various oxygen or nitrogen donor ligands, affording six- or seven- coordinate complexes. Evidence is presented for the rather weak coordination of these Lewis bases to the uranium metal atom. The various possible conformations for these [6,6]-membered chelate complexes are also discussed.