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Schiff base complexes of the lanthanoids and actinoids. Part 3. Lanthanoid(III), cerium(IV), thorium(IV), and Uranium(IV) complexes with NN′-ethylenebis(5-t-butylsalicylideneimine); 1H N.M.R. and other spectroscopic properties

1980; Elsevier BV; Volume: 38; Linguagem: Inglês

10.1016/s0020-1693(00)91951-0

1873-3255

Shahrara Afshar, Joseph I. Bullock,

Metal-Catalyzed Oxygenation Mechanisms

The Schiff base, H2busalen, forms polymeric M2(busalen)3 (M = Pr, Nd, Sm, Eu, Gd, and Ho) and monomeric M(busalen)2 (M = Ce, Th, and U) complexes which are readily soluble in CDCl3, a properly conferred by the presence of the t-butyl groups. The 1H n.m.r. spectra are reported. Very large shifts to low and high field were observed for the paramagnetic complexes and the UIV spectrum was well-resolved with very little broadening. The lanthanoid(III) complexes (M = Pr, Nd, and Sm) are probably eight-coordinate both in solution and the solid state.