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首页> 外文期刊>Bulletin of the National Research Centre >Studies on Lanthanide Dithizone Complexes
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Studies on Lanthanide Dithizone Complexes

机译：镧系双硫zone配合物的研究

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摘要

The extinction coefficients of dithizone and its trivalent lanthanide {La~(+3), Ce~(+3), Nd~(+3), Sm~(+3), Gd~(+3), Dy~(+3) and Er~(+3)} complexes in chloroform as a solvent were investigated. In this respect, five bands obtained in the spectra of dithizone at 200, 230, 264, 450, and 620 nm were assigned. The short wavelength bands at 200, 230 and 264 nm are assigned as (B_(2u) ← A_(1g)), (B_(1u) ← A_(1g)) and (E_(2u) ← A_(1g)) locally excited transitions. The two bands at 450 and 620 nm observed in the visible spectra of dithizone could be satisfactorily assigned as the (n → π~*) transitions of the dithizone and represent thione and thiol structure of the dithizone, respectively. The two bands at 200, and 264 nm were shifted to 212 and 258 nm, also, new band was appeared at about 300 nm for lanthanide dithizone complexes except dysprosium. These may be indicated that the complexes were formed for all cations except dysprosium due to the ionic redistribution reaction giving mixture. The results suggested that the cation bonding take place through both the nitrogen and sulfur atoms of the ligand. The X-ray diffraction was also studied.
机译：双硫zone及其三价镧系元素{La〜（+3），Ce〜（+3），Nd〜（+3），Sm〜（+3），Gd〜（+3），Dy〜（+3）的消光系数）和Er〜（+3）}络合物在氯仿中作为溶剂进行了研究。在这方面，分配了在双硫zone的光谱中在200、230、264、450和620nm处获得的五个带。在200、230和264 nm处的短波段在本地被指定为（B_（2u）←A_（1g）），（B_（1u）←A_（1g））和（E_（2u）←A_（1g））激动的过渡。在双硫zone的可见光谱中观察到的在450和620 nm处的两个谱带可以令人满意地分配为双硫zone的（n→π〜*）跃迁，分别代表双硫zone的硫酮和硫醇结构。 200和264 nm处的两个谱带分别移至212和258 nm，除了for以外，镧系双硫zone配合物在300 nm处出现了新的谱带。这些可能表明由于due的离子再分布反应，对于以外的所有阳离子均形成了络合物。结果表明阳离子键通过配体的氮和硫原子发生。还研究了X射线衍射。

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