STUDIES ON POLYFUNCTIONAL O-LIGANDS - SOLUBILITY AND THERMAL-STABILITY OF 1,2,4,5-BENZENETETRACARBOXYLATE COMPLEXES WITH ALKALI AND ALKALINE-EARTH METAL-IONS

被引：13

作者：

CURINI, R ^{[1
]}

DASCENZO, G ^{[1
]}

DEROBERTIS, A ^{[1
]}

DESTEFANO, C ^{[1
]}

SAMMARTANO, S ^{[1
]}

机构：

[1] UNIV MESSINA,INST ANALYT CHEM,I-98166 S AGATA,ITALY

来源：

THERMOCHIMICA ACTA | 1990年 / 173卷

关键词：

D O I：

10.1016/0040-6031(90)80586-N

中图分类号：

O414.1 [热力学];

学科分类号：

摘要：

A solubility and thermoanalytical study of alkali and alkaline earth solid complexes of pyromellitic acid (1,2,4,5-benzenetetracarboxylic acid, H4L) is reported. The insoluble Na+ species is Na2LH2. K+, Rb+ and Cs+ form MLH3. The stoichiometry of precipitation of H4L with Ca2+, Ba2+ and Sr2+ depends on pH: at pH < 4, MLH2 is formed; in the range 4 < pH < 4.5, we found a mixture of MLH2 and M2L; and at pH > 4.5, only M2L is formed. The pK(s0) of all the species were determined. The insoluble compounds were also characterized by thermogravimetric analysis.

引用

页码：25 / 41

页数：17