MULTI-NUCLEAR NMR-STUDY OF DIBENZO-30-CROWN-10 COMPLEXES WITH SODIUM, POTASSIUM, AND CESIUM IONS IN NON-AQUEOUS SOLVENTS

被引：163

作者：

SHAMSIPUR, M ^{[1
]}

POPOV, AI ^{[1
]}

机构：

[1] MICHIGAN STATE UNIV,DEPT CHEM,E LANSING,MI 48824

来源：

JOURNAL OF THE AMERICAN CHEMICAL SOCIETY | 1979年 / 101卷 / 15期

关键词：

D O I：

10.1021/ja00509a005

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

Nuclear magnetic resonances of23Na,l33Cs, andl3C nuclei were used to study the sodium, potassium, and cesium ion complexes with dibenzo-30-crown-10 (L) in nitromethane, acetonitrile, acetone, methanol, and pyridine solutions. Potassium and cesium ions formed 1:1 complexes, but in the case of the sodium ion three complexes with the respective stoichiometrics Na2L, Na3L2, and NaL were identified in solutions. The NMR data support the existence of a “wrap around” structure for Cs+-DB30C10 complex in solution. The chemical shift of the133Cs resonance was studied as a function of DB30C10/Cs+mole ratio at various temperatures in different solvents and from these data ΔG°, ΔH°, and ΔS° values for the complexation reactions were calculated. In all cases the complexes were enthalpy stabilized but entropy destabilized. © 1979, American Chemical Society. All rights reserved.

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页码：4051 / 4055

页数：5

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