133Cs NMR Study of Cs+ Ion Complexes with Aza-18-crown-6, Diaza-18-crown-6 and Dibenzyldiaza-18-crown-6 in Binary Acetonitrile-Nitromethane Mixtures

被引：2

作者：

Shamsipur, Mojtaba ^{[1
]}

Gilani, Nastaran Sohrabi ^{[2
]}

Rofouei, Mohammad Kazem ^{[2
]}

机构：

[1] Razi Univ, Dept Chem, Kermanshah, Iran

[2] Teacher Training Univ, Tehran, Iran

来源：

JOURNAL OF SOLUTION CHEMISTRY | 2011年 / 40卷 / 01期

关键词：

Azacrowns; Cs+ ion; Mixed solvent; Cs-133; NMR; Complex stability; TRANSITION-METAL IONS; KINETIC-DATA; MACROCYCLE INTERACTION; LI-7; NMR; EXCHANGE KINETICS; ALKALINE-EARTH; CROWN-ETHERS; LITHIUM ION; STOICHIOMETRY; STABILITY;

D O I：

10.1007/s10953-010-9625-7

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Cesium-133 nuclear magnetic resonance spectroscopy was used as a sensitive probe to investigate the stoichiometry and stability of Cs+ ion complexes with aza-18-crown-6 (A18C6), diaza-18-crown-6 (DA18C6) and dibenzylediaza-18-crown-6 (DBzDA18C6) in different binary acetonitrile-nitromethane mixtures. In all cases, the exchange between free and complexed cesium ion was fast on the NMR time scale and only a single population average resonance was observed. The Cs-133 chemical shift-mole ratio data indicated that the cesium ion forms 1:1 cation-ligand complexes with the investigated azacrowns in all acetonitrile-nitromethane mixtures. The formation constants of the resulting complexes were evaluated from computer fitting of the chemical shift-mole ratio data. The stability of the resulting 1:1 complexes with Cs+ were found to vary in the order A18C6 > DBzDA18C6 > DA18C6. In all cases, there is the inverse relationship between the complex stability constants and the amount of acetonitrile in the mixed solvent.

引用

页码：40 / 47

页数：8

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