Synthesis, X-ray structure and magnetic studies of Cu(II) complexes of tridentate SNS ligands (S-dbpt, N,N,N′,N′-tetraisobutylpyridine-2,6-dithiocarboxamide; S-dppt, N,N,N′,N′-tetraisopropylpyridine-2,6-dithiocarboxamide): Role
- 作者：Ramesh Kapoor ; Ashok Kataria ; Pratibha Kapoor ; Ajay Pal Singh Pannu ; Maninder Singh Hundal ; Montserrat Corbella
- 关键词：Pyridine-2 ; 6-dithiocarboxamide ligand ; Cu(II) complexes ; X-ray structure ; Magnetic studies
- 刊名：Polyhedron
- 出版年：2007
- 期刊代码：87_02775387
- 类别：ch
- 出版时间：30 October 2007
- 卷：26
- 期：17
- 页码：5131-5138
- 文件大小：412 K
摘要
The synthesis, structure and magnetic properties of two new tetranuclear copper(II) compounds [{Cu(S-dbpt)}<sub>2sub>(μ-Cl)<sub>2sub>][{CuCl<sub>2sub>}<sub>2sub>(μ-Cl)<sub>2sub>] (S-dbpt; N,N,N′,N′-tetraisobutylpyridine-2,6-dithiocarboxamide) <strong>1strong> and [{CuCl(S-dppt)}]<sub>2sub>[{CuCl<sub>2sub>}<sub>2sub>(μ-Cl)<sub>2sub>] (S-dppt; N,N,N′,N′-tetraisopropylpyridine-2,6-dithiocarboxamide) <strong>2strong> are reported. Both compounds contain a cationic complex with copper(II) coordinated to the ligand through both the thioamide S atoms and pyridilic N atom and one chlorine atom. The structure of the cationic dinuclear entity [{Cu(S-dbpt)}<sub>2sub>(μ-Cl)<sub>2sub>]<sup>2+sup> in <strong>1strong> consists of two square pyramids sharing a basal to apical edge. For compound <strong>2strong>, there are two cationic mononuclear complexes [{CuCl(S-dppt)}]<sup>+sup>. Both compounds contain the same dinuclear chlorine bridged anion [{CuCl<sub>2sub>}<sub>2sub>(μ-Cl)<sub>2sub>]<sup>2−sup>, containing a planar [Cu<sub>2sub>(μ-Cl)<sub>2sub>] core. Magnetic susceptibility measurements show weak antiferromagnetic coupling between the Cu(II) ions in these anionic complexes (J = −077 cm<sup>−1sup> for <strong>1strong> and 0.88 cm<sup>−1sup> for <strong>2strong>). The cationic complex of <strong>1strong> shows a ferromagnetic interaction with J = +3.2 cm<sup>−1sup>.