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Polyamines XV. Thermodynamics of Metal Complex Formation of Linear Tetraamines Containing Two Ethylenediamine Residues

✍ Scribed by Giorgio Anderegg; Peter Bläuenstein

Book ID
102857901
Publisher
John Wiley and Sons
Year
1982
Tongue
German
Weight
639 KB
Volume
65
Category
Article
ISSN
0018-019X

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✦ Synopsis

The complex formation of Co2+, Ni2+, Cu2+, Zn2+, Pb2+ and Hg2+ with three

for n = 2. 3 and 4, and with N-methylethylenediamine (= nmen) have been investigated at 25" and I=1(KNO3). The stability constants and the heat evolved by formation of the (1 : 1)-complexes ML have been determined. It is shown that the more stable complexes are normally formed by 2,3,2-tet-ligands. These results are discussed relating the thermodynamic data obtained to the stereochemistry of the complexes and using the visible spectra of the complexes in solution. The change in enthalpy is found to be the dominant factor and the measure of the steric strain whereas the entropy of complex formation decreases slowly.

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Some results in this paper are taken from the thesis of P. B.

📜 SIMILAR VOLUMES

Polyamines XIV. Protonation Equilibria o
Polyamines XIV. Protonation Equilibria of Linear Tetraamines Containing two Ethylenediamine Residues
✍ Giorgio Anderegg; Peter Bläuenstein 📂 Article 📅 1982 🏛 John Wiley and Sons 🌐 German ⚖ 396 KB

The syntheses of the linear tetraamines H2N-(CH2)2-NH-(CH,),-NH-(CH2)2 -NH2 (n = 4 and 5) are described. The protonation of the homologous tetraamines for n=2, 3, 4, 5, 6 and 8, as well as of N-methylethylenediamine, was investigated using potentiometric and calorimetric measurements. The results ob