Abstract
A novel series of UO22+ complexes with 5-(4 ' -derivatives phenyldiazo)-8-hydroxy-7-quinolinecarboxaldehyde (L1H-L7H), have been prepared. The composition and structure were confirmed by elemental analyses, (HNMR)-H-1 spectra and IR spectroscopy measurements. Data From the above show that they exist in two isomeric solid forms. The polymeric structure results from intermolecular U=O...U=O) interactions. The ligands act as a monobasic bidentate chelating agent coordinating through C=O and OH groups by replacement of a proton from the latter group. The force constant FU-O (mdyn (A) over dot(-1)) and the bond length RU-O (Angstrom) of the U-O bond were calculated from the IR data and related to the electronic properties of the substituents. The existing literature on the coordination chemistry of these ligands are obscure. (C) 2001 Elsevier Science B.V. All rights reserved.