Synthesis, structure and spectroscopic characterization of Ni(II), Co(II), Cu(II) and Zn(II) complexes with saccharinate and pyrazole
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- 作者：Grettel Valle-Bourrouet ; Leslie W. Pineda ; Larry R. Falvello ; Rosa Lusar ; Thomas Weyhermueller
- 关键词：Saccharinate complexes ; Hydrogen bonds ; Pyrazole metal complexes ; Cooper ; Cobalt ; Nickel
- 刊名：Polyhedron
- 出版年：2007
- 出版时间：20 September 2007
- 年：2007
- 卷：26
- 期：15
- 页码：4470-4478
- 全文大小：512 K
文摘
Four mononuclear mixed-ligand complexes of Co(II), Ni(II), Cu(II) and Zn(II), with saccharin (sac) and pyrazole (Hpz) were synthesized and characterized on the basis of elemental analysis, FT-IR spectroscopy, magnetic susceptibility, thermal analysis data and X-ray diffraction. The [Co(sac)2(Hpz)2(H2O)2] (1) and [Ni(sac)2(Hpz)2(H2O)2] (2) had similar molecular structures but distinct monoclinic crystal structure types (space group P21/n for 1 and P21/c for 2); the members of each pair of ligands were mutually trans. The saccharinate ligands were N-coordinated. The copper complex showed the same coordination environment as the Co and Ni complexes but crystallizes in the triclinic space group ![]()
www.sciencedirect.com/cache/MiamiImageURL/B6TH8-4NXXMBW-4-4/0?wchp=dGLbVzb-zSkWA"" alt=""Click to view the MathML source"" align=""absbottom"" border=""0"" height=15 width=20> and presented pseudo-Jahn–Teller distortion along the O(w)–Cu–O(w) bonds. The [Zn(sac)2(pz)2] complex was tetrahedrally coordinated and crystallized in the monoclinic space group C2/c. Thermal decomposition of the complexes in a nitrogen atmosphere resulted in removal of the water molecules and pyrazole ligands at relatively low temperature and formation of stable metal saccharinates as intermediates, which also decomposed at higher temperatures, about 300 °C.