133Cs NMR Study of Cs+ Ion Complexes with Dibenzo-24-crown-8, Dicyclohexano-24-crown-8 and Dibenzo-30-crown-10 in Binary Acetonitrile-Nitromethane Mixtures

被引：2

作者：

Rofouei, Mohammad Kazem ^{[1
]}

Taghdiri, Mehdi ^{[2
]}

Shamsipur, Mojtaba ^{[3
]}

Alizadeh, Kamal ^{[4
]}

机构：

[1] Tarbiat Moallem Univ, Dept Chem, Tehran, Iran

[2] PNU, Dept Chem, Ardakan, Yazd, Iran

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

[4] Lorestan Univ, Dept Chem, Khorramabad, Iran

来源：

JOURNAL OF SOLUTION CHEMISTRY | 2010年 / 39卷 / 09期

关键词：

Dibenzo-24-crown-8; Dicyclohexano-24-crown-8; Dibenzo-30-crown-10; Cs+ complex; NMR; Mixed solvent; NUCLEAR-MAGNETIC-RESONANCE; ALKALI-METAL IONS; CROWN-ETHERS; PREFERENTIAL SOLVATION; KINETIC-DATA; AB-INITIO; CATIONS; CESIUM; CONDUCTANCE; SODIUM;

D O I：

10.1007/s10953-010-9581-2

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：

Complexation of the cesium ion with the macrocyclic ligands: dibenzo-24-crown-8 (DB24C8), dicyclohexano-24-crown-8 (DC24C8) and dibenzo-30-crown-10 (DB30C10) was studied in binary acetonitrile-nitromethane mixtures by Cs-133 NMR spectroscopy. The Cs-133 chemical shift data indicated that the cesium cation forms 1:1 cation:ligand complexes with DB24C8 and DB30C10 but forms 2:1, 1:1 and 1:2 cation:ligand complexes with DC24C8 in acetonitrile-nitromethane mixtures. The formation constants of the complexes were calculated from the computer fitting of the chemical shift mole ratio data. The results show that the complex formation constants with the Cs+ cation vary in the order DC24C8 > DB24C8 similar to DB30C10. It was found that the stability of the resulting complexes increases with increasing nitromethane concentration in the solvent mixture.

引用

页码：1350 / 1359

页数：10

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