Complexation of Zn(II), Cd(II) and Hg(II) with thiourea and selenourea:: A 1H, 13C, 15N, 77Se and 113Cd solution and solid-state NMR study
Complexation of Zn(II), Cd(II) and Hg(II) with thiourea and selenourea:: A 1H, 13C, 15N, 77Se and 113Cd solution and solid-state NMR study
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DOI：
10.1080/00958970500038951
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发表时间：
2005-04-15
影响因子：
1.9
通讯作者：
Wazeer, MIM
中科院分区：
文献类型：
--
作者：
Isab, AA;Wazeer, MIM
本文报道了硫脲（TU）和硒代亚硒酸钠（SeU）的锌（II）、镉（II）和汞（II）配合物的合成，其通式为M（TU）（2）Cl-2或M（SCU）（2）Cl-2。通过元素分析和NMR（H-1，C-13，N-15，Se-77和Cd-113）谱对配合物进行了表征。在C-13 NMR中硫酮的C=S共振的低频位移和在H-1和N-15 NMR中N-H共振的高频位移与硫或硒与金属离子的配位一致。在Se-77 NMR中，Cd（SeU）（2）Cl-2中的Se核在配位时相对于游离配体被87 ppm去屏蔽。相比之下，类似的Zn（II）和Hg（II）配合物分别显示出33和50 ppm的去屏蔽，表明Se与Cd的轨道重叠更好。Se-77和Cd-113屏蔽张量的主成分由固态NMR数据确定。
Zinc(II), cadmium(II) and mercury(II) complexes of thiourea (TU) and selenourea (SeU) of general formula M(TU)(2)Cl-2 or M(SCU)(2)Cl-2 have been prepared. The complexes were characterized by elemental analysis and NMR (H-1, C-13, N-15, Se-77 and Cd-113) spectroscopy. A low-frequency shift of the C=S resonance of thiones in C-13 NMR and high-frequency shifts of N-H resonances in H-1 and N-15 NMR are consistent with sulfur or selenium coordination to the metal ions. The Se nucleus in Cd(SeU)(2)Cl-2 in Se-77 NMR is deshielded by 87 ppm on coordination, relative to the free ligand. In comparison, the analogous Zn(II) and Hg(II) complexes show deshielding by 33 and 50 ppm, respectively, indicating that the orbital overlap of Se with Cd is better. Principal components of Se-77 and Cd-113 shielding tensors were determined from solid-state NMR data.