Structural, spectral and magnetic properties of carboxylato cobalt(II) complexes with heterocyclic N-donor ligands: Reconstruction of magnetic parameters from electronic spectra
- 作者：J. Titi&scaron ; a ; jan.titis@ucm.sk ; jan.titis@post.sk ; J. Hudá ; ka ; J. Ko啪í ; &scaron ; ekc ; A. Kruto&scaron ; í ; ková ; a ; J. Moncol&rsquo ; b ; D. Tarabová ; d ; R. Bo膷aa ; b
- 关键词：Cobalt(II) complexes ; N-heterocyclic ligands ; Crystal structure ; Electronic spectra ; Magnetic parameters
- 出版年：2012
- 期刊代码：40_00201693
- 类别：ch
- 出版时间：15 June, 2012
- 卷：388
- 期：Complete
- 页码：106-113
- 文件大小：601 K
摘要
Heteroleptic cobalt(II) complexes with general formula of [Co(N-base)2(car)2(H2O)2], have been synthesized and structurally characterized; the N-base stands for neutral N-donor ligands: iso-quinoline (iqu), [1]benzofuro[3,2-c]pyridine (bzfupy), 1-(pyridin-3-yl)[1]benzofuro[3,2-c]pyridine (1-py-bzfupy) and 1-phenyl-1H-imidazole (bylim); car = acetato (ac) or benzoato (bz) ligands. The structure of [Co(iqu)2(ac)2(H2O)2] 1, [Co(bzfupy)2(ac)2路(H2O)2] 2, [Co(1-py-bzfupy)2(ac)2(H2O)2]路H2O 3 and [Co(bylim)2(bz)2(H2O)2] 4 complexes is formed of the {CoN2O2O2鈥瞹 chromophore. These complexes were subjected to magnetochemical investigation down to 2 K (susceptibility and magnetization measurements). They show magnetic behavior typical for the zero-field splitting systems. The axial parameter of the zero-field splitting adopts large values, D = 80-103 cm鈭?. We have analyzed electronic spectra of the complexes in detail with aim to extract the crystal-field parameters. These have been used for reconstruction of the magnetic parameters. The calculated axial ZFS parameters are in good agreement with the experimental values.