Syntheses and X-ray structural studies of the novel complexes [Ni(en)(2)(3-pyt)(2)] and [Cu(en)(2)](3-pyt)(2) based on 5-(3-pyridyl)-1,3,4-oxadiazole-2-thione

摘要

Two novel mononuclear mixed-ligand complexes [Ni(en)(2)(3-pyt)(2)] (1) and [Cu(en)(2)](3-pyt)(2) (2), derived from potassium [N'-(pyridine-3-carbonyl)-hydrazinecarbodithioate [K+(H2L)(-)] and containing en as a coligand, have been synthesized. The [K+(H2L)(-)] undergoes cyclization in the presence of ethylenediamine (en) and is converted to 5-(3-pyridyl)-1,3,4-oxadiazole-2-thione (3-pyt)(-). [Ni(en)(2)(3-pyt)(2)] and [Cu(en)(2)](3-pyt)(2) have been characterized with the aid of elemental analyses, IR, UV-Vis, magnetic susceptibility and single crystal X-ray studies. The complexes 1 and 2 crystallize in the orthorhombic and monoclinic systems with space groups Pca2(1) and C2/c, respectively. The single crystal X-ray diffraction studies of both complexes indicate that (3-pyt)(-) adopts a thione form in 1 but is present as a thiolato form in 2. (C) 2008 Elsevier Ltd. All rights reserved.