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A new Schiff base of picolinaldehyde N-oxide with semicarbazide, [(C7H8N4O2)2H] (L), and its gold(III), palladium(II) and platinum(IV) complexes [(L)2H][AuCl4] (1), [LH·H2O]2[PdCl4]·2H2O (2) and [(L)2H]2[PtCl6]·6H2O (3) have been synthesized and characterized by elemental analyses, molar conductance, UV, IR, 1H NMR, fluorescent spectra and TG-DTA techniques. A single crystal X-ray study of the complex (2) is also reported.

The title complexes, diaquadi(2,2''-bipyridine)di(dichloroacetato)lanthanide(III) monodichloroacetato [Ln(CHCl2COO)2(2,2'-bipy)2(H2O)2]+(CHCl2COO)-(Ln = Dy, Ho, Tm, Er, Yb], were obtained and characterized. [Er(CHCl2COO)2(2,2'-bipy)2(H2O)2]+(CHCl2COO)- crystallizes in the mooclinic space group P21/n with Z = 4. Cell dimensions are a = 15.886(9), b = 13.758(2), c = 16.343(4)Å, β = 113.31(3)°, and the structure was refined to an R of 0.049 for 3415 observed reflections. The Er(III) ion exhibits a distorted, square antiprismatic configuration. Four N atoms of 2,2'-bipy and four O atoms from two dichloroacetato and two water ligands are coordinated. One dichloroacetato group lies outside the polyhedron and is connected with water ligands by hydrogen bonds.