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Metal Complexes with Macrocylclic Ligands. Part XXXV. Stabilities of some bivalent metal-ion complexes with 1,4,7-triazacyclononane-1-acetie acid

✍ Scribed by Hui-Zhi Cai; Thomas A. Kaden

Publisher: John Wiley and Sons
Year: 1993
Tongue: German
Weight: 256 KB
Volume: 76
Category: Article
ISSN: 0018-019X
DOI: 10.1002/hlca.19930760137

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✦ Synopsis

Abstract

The stability constants of the Mn^2+^, Zn^2+^, Ni^2+^, pb^2+^, and Cd^2+^ complexes with 1,4,7‐triazacylononane‐1‐acetic acid (noma) were determined at 25° and 0.5M (KNO~3~) by potentiometric titrations. The species [ML] and [ML(OH)] were found in al cases except for Ni^2+^, whereas [ML~2~] was only detected for Cd^2+^. For the complexes [ML], the order of stability is Mn^2+^ < Cd^2+^ < pb^2+^ < Zn^2+^ < Zn^2+^ < Ni^2+^ < Cu ^2+^, which is consisten with the Irvin‐Williams Series.

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