Synthesis and structural studies on new MX2L2 dihalocomplexes of 1-methyllumazine and 1,6,7-trimethyllumazine. Crystal structure of copper(II) and palladium(II) complexes
نویسندگان
چکیده
In order to continue our studies in coordination chemistry with pteridine derivatives, four new complexes with general formula MX2(pteridine)2 /nH2O /mCH3CN (M /Cu, Pd, Pt) have been synthesized by reaction of 1-methyllumazine (MLM) and 1,6,7trimethyllumazine (MLMD) and different halide salts in acetonitrile solutions. These compounds have been characterized by means of analytical techniques (elemental analysis and TG), spectral methods (IR, C and H NMR, UV /Vis /NIR, EPR) and magnetics measurements. Single-crystal X-ray diffraction studies have been developed on the [CuCl2(MLM)2] and [PdBr2(MLM)2] complexes. In the complex Cu/MLM, a six-coordinated environment around metal ion is shown, with two pteridine ligands behaving in a bidentante manner through N5/O4 atoms being the other positions occupied by two chlorine atoms. The molecular unit of the compound Pd/MLM shows an ion Pd(II) linking to two bromide ions placed in a trans position, and two N5 atoms of two organic ligands, exhibiting a square-planar geometry as it is usual in complexes with d-configuration ions. # 2002 Elsevier Science Ltd. All rights reserved.
منابع مشابه
Synthesis and characterization of new complexes formed between 1-methyllumazine and 1,6,7-trimethyllumazine ligand with transition metal(II) nitrate. Crystal structure of cobalt(II), copper(II) and cadmium(II) complexes
The structures and spectroscopic properties of Co(II), Ni(II), Cu(II), Zn(II) and Cd(II) nitrate complexes of 1-methyllumazine (MLM) and 1,6,7-trimethyllumazine (MLMD) with general formula M(II)(NO3)2L2 /nH2O are reported. In all the complexes, the lumazine-derived ligands seem to be coordinated in bidentate form through the N5 and O4 atoms. The crystal structures of [Cu(MLM)2(H2O)2](NO3)2 (1),...
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