Dioxouranium complexes of 2,2-dihydroxyazobenzene : Binding of mono- and bidentate Lewis bases

Uranyl complexes of 2,2ʹ-dihydroxyazobcnzcnc (H2L) and its adducts with monodcntatc (B) and bidcntate (B-B) Lewis bases of the type [UO2hL.B.HO] (B= py, mu-pic, imz, dmf, dmso, tppo) and [U02L(B-B)] (B-B = bpy, ophen, dpa) arc described. The complexes are pentagonal bipyramidal. The five coordination positions on the equator arc occupied by the combination of ligand L , B, HiO or B-B.