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Zur Stabilität der Metallkomplexe von Methantriessigsäure und cis, cis-1,3,5-Cyclohexantricarbonsäure

✍ Scribed by Yi-He Wu; Thomas A. Kaden

Publisher
John Wiley and Sons
Year
1983
Tongue
German
Weight
283 KB
Volume
66
Category
Article
ISSN
0018-019X

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✦ Synopsis

The stabilities of the Mn^2+^‐, Co^2+^‐, Ni^2+^‐, Cu^2+^‐ and Zn^2+^‐complexes with 2‐(carboxymethyl)glutaric acid (2) and cis,cis‐1,3,5‐cyclohexanetricarboxylic acid (3) were measured potentiometrically at 25° and I = 0.5 (KNO~3~). Beside the complexes ML^−^ protonated species MLH and MLH are also formed. Their stability constants are given in Table 1. A comparison between the stabilities of 2 or 3 and those of acetate, as a model for a monocarboxylate, or succinate and glutarate, as examples for dicarboxylates, indicates that in all species only one carboxylate is strongly bound whereas the second and third ones are probably not.

The observation that Δlog K~1~ = log K − log K as well as Δlog K~2~ = log K − log K are practically constants with values of 0.34 ± 0.05 and 0.49 ± 0.07, respectively, for both ligands and the five metal ions studied is also in line with the proposed monodentate structures of the complexes ML^−^, MLH and MLH.

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