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Metal Complexes with Macrocyclic Ligands. X. On the metal complexation kinetics of two N4-macrocycles containing a pyridine ring

✍ Scribed by Philipp Schultz-Grunow; Thomas A. Kaden

Publisher
John Wiley and Sons
Year
1978
Tongue
German
Weight
254 KB
Volume
61
Category
Article
ISSN
0018-019X

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✦ Synopsis

Abstract

The complexation kinetics of the two macrocycles 1 and 2 with Co^2+^, Ni^2+^, Cu^2+^ and Zn^2+^ have been measured by pH‐stat techniques. The rates are first order in metal and ligand concentration and depend upon the pH. This results from the different reactivities of the various protonated species of the macrocyclic tetraamines. The resolved rate constants are given in Table 2.

In comparison with other 14‐membered cyclic aliphatic tetraazasystems 1 and 2 react more slowly with metal ions. This might be a consequence of the more rigid structure induced by the pyridine ring.

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