A CALORIMETRIC STUDY ON COMPLEX-FORMATION OF N-BENZOYL-CHALCOGENO(O,S,SE)UREAS AND METAL-IONS OF THE 4TH, 5TH, AND 6TH PERIOD OF THE PERIODIC-TABLE OF ELEMENTS IN DIOXANE WATER SOLUTION

被引：12

作者：

DIETZE, F ^{[1
]}

LERCHNER, J ^{[1
]}

SCHMIDT, S ^{[1
]}

BEYER, L ^{[1
]}

KOHLER, R ^{[1
]}

机构：

[1] TH LEIPZIG,SEKT NAT WISSENSCH,O-7030 LEIPZIG,GERMANY

来源：

ZEITSCHRIFT FUR ANORGANISCHE UND ALLGEMEINE CHEMIE | 1991年 / 600卷 / 09期

关键词：

CALORIMETRY; COMPLEX FORMATION; N-BENZOYL-CHALCOGENO(O; S; SE)UREAS; MAIN GROUP AND SUBGROUP METALS; POLARIZABILITY;

D O I：

10.1002/zaac.19916000106

中图分类号：

O61 [无机化学];

学科分类号：

070301 ; 081704 ;

摘要：

Enthalpies of protonation and metal complex formation of 3 analogous N',N'-diethyl-N-benzoyl-chalcogeno(O,S,Se)ureas have been measured by titration calorimetry. Using known stability constants the reaction entropies have been calculated. The free ligands HL are verified to react as NH-acids which are controlled by entropy. Increasing atomic numbers of the reacting metal ions and of the donor atoms of the ligands heighten the complexation enthalpy. The values of enthalpy can be correlated fairly well with the ionic potential and electric polarizability of the metal ions. The remarkable gain of entropy mainly depends on the high number of lost molecules from the extended solvation shell of the reacting species in the dioxane/water mixture.

引用

页码：37 / 46

页数：10

共 37 条

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