在乙腈-二甲基亚砜和硝基甲烷-二甲基亚砜混合物中，不同金属离子与二苯并-21-冠-7络合的竞争性铯-133核磁共振光谱研究。
Competitive cesium-133 NMR spectroscopic study of complexation of different metal ions with dibenzo-21-crown-7 in acetonitrile-dimethylsulfoxide and nitromethane-dimethylsulfoxide mixtures.
作者信息
Sahmsipur Mojtaba, Dastjerdi Leila Shafiee, Alizadeh Nader, Bijanzadeh Hamid Reza
机构信息
Department of Chemistry, Razi University, Kermanshah, Iran.
出版信息
Spectrochim Acta A Mol Biomol Spectrosc. 2008 Apr;69(4):1265-70. doi: 10.1016/j.saa.2007.07.004. Epub 2007 Jul 12.
(133)Cs NMR spectroscopy was used to determine the stoichiometry and stability of the Cs(+) ion complex with dibenzo-21-crown-7 (DB21C7) in acetonitrile-dimethylsulfoxide (96.5:3.5, w/w) and nitromethane-dimethylsulfoxide (96.5:3.5, w/w) mixtures. A competitive (133)Cs NMR technique was also employed to probe the complexation of Na(+), K(+), Rb(+), Ag(+), Tl(+), NH(4)(+), Mg(2+), Ba(2+), Hg(2+), Pb(2+) and UO(2)(2+) ions with DB21C7 in the same solvent systems. All the resulting 1:1 complexes in nitromethane-dimethylsulfoxide were more stable than those in acetonitrile-dimethylsulfoxide solution. In both solvent systems, the stability of the resulting complexes was found to vary in the order Rb(+)>K(+) approximately Ba(2+)>Tl(+)>Cs(+)>NH(4)(+) approximately Pb(2+)>Ag(+)>UO(2)(2+)>Hg(2+)>Mg(2+)>Na(+).
采用¹³³Cs核磁共振光谱法测定了在乙腈 - 二甲亚砜（96.5:3.5，w/w）和硝基甲烷 - 二甲亚砜（96.5:3.5，w/w）混合溶剂中Cs⁺离子与二苯并 - 21 - 冠 - 7（DB21C7）形成的配合物的化学计量比和稳定性。还采用竞争¹³³Cs核磁共振技术研究了在相同溶剂体系中Na⁺、K⁺、Rb⁺、Ag⁺、Tl⁺、NH₄⁺、Mg²⁺、Ba²⁺、Hg²⁺、Pb²⁺和UO₂²⁺离子与DB21C7的络合情况。在硝基甲烷 - 二甲亚砜中形成的所有1:1配合物都比在乙腈 - 二甲亚砜溶液中更稳定。在这两种溶剂体系中，发现形成的配合物稳定性按以下顺序变化：Rb⁺>K⁺≈Ba²⁺>Tl⁺>Cs⁺>NH₄⁺≈Pb²⁺>Ag⁺>UO₂²⁺>Hg²⁺>Mg²⁺>Na⁺。
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