Complexes of a triazine-3-thione ligand with divalent metals: Crystal structure of [CdL₂DMF]₂ · 2DMF · 1/4H₂O

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• 作者：Elena L&#xf3 ; pez-Torres and M. Antonia Mendiola
• 关键词：Triazine ; Metal complexes ; Crystal structure ; Cyclic voltammetry
• 刊名：Polyhedron
• 出版年：2005
• 期刊代码：87_02775387
• 类别：ch
• 出版时间：2005
• 卷：24
• 期：12
• 页码：1435-1444
• 文件大小：383 K

摘要

The synthesis and characterization of Cd(II), Zn(II), Pb(II), Co(III) and Ni(II) complexes of 5-methoxy-5,6-diphenyl-4,5-dihydro-2H-[1,2,4]triazine-3-thione LH₂OCH₃ are reported. The stoichiometry of the complexes was found to be 1:2 except for cobalt complex 4 where the ratio is 1:3. In all complexes the triazine is deprotonated and acts at least as a NS bidentate ligand. The complexes have been characterised by microanalysis, mass spectrometry, IR, multinuclear (¹H, ¹³C and ¹¹³Cd) NMR, ¹³C CP/MAS NMR and magnetic susceptibility. In addition, the structure of the complex [Cd(DMF)L₂]₂ · 2DMF · 1/4H₂O (1a), has been determined by X-ray diffraction. Crystallographic data show that the complex consists of a dinuclear structure, in which the ligands act as bidentate NS donors and with two of the four ligands acting as a bridge between the metal ions via the sulfur atom. According to the spectroscopic data, the same disposition is proposed for complexes 2 and 3. Complex 4 is an low spin octahedral monomeric structure with the ligand acting as a bidentate NS donor and where the metal has been oxidised to Co(III). In complex 5 the Ni(II) ion is in a square planar N₂S₂ disposition, formed by two ligands. The redox behaviour of the cadmium and cobalt complexes was explored by cyclic voltammetry and shows metal-centred processes.