THE ION DIPOLE INTERACTION MECHANISM OF MACROCYCLIC ETHERS WITH C-13 DIPOLE DIPOLE RELAXATION-TIME MEASUREMENTS .9. THE STABILITIES OF 18-CROWN-6 COMPLEXES WITH NA+ AND K+ IN D2O AND METHANOL-D

被引：5

作者：

ERK, C ^{[1
]}

机构：

[1] DICLE UNIV DIYARBAKIR,FAC ART & SCI,DEPT CHEM,DIYARBAKIR,TURKEY

来源：

THERMOCHIMICA ACTA | 1991年 / 180卷

关键词：

D O I：

10.1016/0040-6031(91)80401-4

中图分类号：

O414.1 [热力学];

学科分类号：

摘要：

The stabilities of various stoichiometries of the 18-crown-6 ether complexes with Na+ and K+ in methanol-d and D2O were estimated by means of an NMR method using C-13 T1 relaxation time measurements. The experimental coordination conditions were established by maintaining an identical ion/ligand concentration. The evidence was evaluated using the expression of dependence of the mole fraction of the bound ligand, P(AE), to the experimental dipole-dipole relaxation time, T1obs: P(AE) = (1/T1obs - 1/T(E))/(1/T(AE) - 1/T(E)). The equilibrium constants K(e) for complex formation were obtained through the expression and regression of 1/K(e)[E0]n+m-1 = (1 - nP')n(1 - mP')m/P' where P' = P(AE)/(1 + P(AE)(m - 1)). The existence of various n:m ratios of complexes in solution has also been verified with the simulation of the T(AE) behaviour of each stoichiometry.

引用

页码：317 / 324

页数：8

共 24 条

[1] NA+ EXCHANGE-REACTIONS OF MONENSIN IN METHANOL AND METHANOL WATER MIXTURES - A NA-23 NMR-STUDY [J].

AMAT, E ;

COX, BG ;

RZESZOTARSKA, J ;

SCHNEIDER, H .

JOURNAL OF THE AMERICAN CHEMICAL SOCIETY, 1988, 110 (11) :3368-3372

[2]

CAKIR U, 1990, THERMOCHIM ACTA, V178, P67

[3] NUCLEAR MAGNETIC-RELAXATION STUDIES OF PREFERENTIAL SOLVATION IN ELECTROLYTE-SOLUTIONS - INDIRECT METHOD USING ONLY SOLVENT-SOLVENT MAGNETIC-INTERACTIONS [J].

CAPPARELLI, AL ;

GILL, DS ;

HERTZ, HG ;

TUTSCH, R ;

WEINGARTNER, H .

JOURNAL OF THE CHEMICAL SOCIETY-FARADAY TRANSACTIONS I, 1978, 74 :1834-1848

[4]

CHRISTENSEN JJ, 1985, CHEM REV, V85, P271

[5] DYNAMICS OF CROWN AND LARIAT ETHER CATION COMPLEXATION ASSESSED BY C-13 NMR RELAXATION-TIMES [J].

ECHEGOYEN, L ;

KAIFER, A ;

DURST, H ;

SCHULTZ, RA ;

DISHONG, DM ;

GOLI, DM ;

GOKEL, GW .

JOURNAL OF THE AMERICAN CHEMICAL SOCIETY, 1984, 106 (18) :5100-5103

[6] MULTINUCLEAR NMR RELAXATION STUDIES OF CROWN ETHERS AND ALKALI CATION CROWN ETHER COMPLEXES [J].

ELIASSON, B ;

LARSSON, KM ;

KOWALEWSKI, J .

JOURNAL OF PHYSICAL CHEMISTRY, 1985, 89 (02) :258-261

[7] THE COMPLEXATION OF CYCLIC POLYETHERS AND A SERIES OF EQUATIONS FOR DETERMINATION OF EQUILIBRIUM-CONSTANTS [J].

ERK, C .

THERMOCHIMICA ACTA, 1988, 131 :125-131

[8] THE DIPOLE-DIPOLE RELAXATION-TIME AND INTERNAL MOTIONS OF THE CYCLIC OLIGOETHERS .3. THE ACTIVATION-ENERGIES OF PSEUDOROTATION OF 1,4,7,10-TETRAOXACYCLODODECANE AND ITS LI+, CA-2+ AND MG-2+ COMPLEXES, (+) [J].

ERK, C .

SPECTROSCOPY LETTERS, 1986, 19 (10) :1175-1182

[9] THE C-13 DIPOLE-DIPOLE RELAXATION AND PSEUDOROTATION OF SOME MACROCYCLIC ETHERS AND A POLYOXALACTONE [J].

ERK, C .

APPLIED SPECTROSCOPY, 1986, 40 (01) :100-103

[10] DETERMINATION OF THE ASSOCIATION CONSTANTS OF MACROCYCLIC ETHERS BY THE AID OF C-13 DIPOLE-DIPOLE RELAXATION-TIME MEASUREMENTS .1. LI+, MG2+ AND CA2+ COMPLEXES OF 1,4,7,10-TETRAOXACYCLODODECANE [J].

ERK, C .

SPECTROSCOPY LETTERS, 1985, 18 (09) :723-730

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