Two different coordination modes of the Schiff base derived from ortho-vanillin and 2-(2-aminomethyl)pyridine in a mononuclear uranyl complex

This work describes the reaction of the potentially tetradentate Schiff-base ligand N-(2-pyridylmethy)-3-methoxysalicylaldimine (HL) with UO(2)(O(2)CMe)(2)·2H(2)O and UO(2)(NO(3))(2)· 6H(2)O in MeOH in the absence or presence of an external base, respectively. The product from these reactions is the mononuclear complex [UO(2)(L)(2)] (1). Its structure has been determined by single-crystal, X-ray crystallography. The anionic ligand adopts two different coordination modes (1.1011, 1.1010; Harris notation) in the complex. The new compound was fully characterized by solid-state (IR, Raman and Photoluminescence spectroscopies) and solution (UV-Vis and (1)H NMR spectra, conductivity measurements) techniques.