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Stabilité dans le méthanol et propriétés thermodynamiques de transfert des cryptates de certains cations de transition et de métaux lourds

✍ Scribed by Par Bernard Spiess; Françoise Arnaud-Neu; Marie-José Schwing-Weill

Publisher
John Wiley and Sons
Year
1980
Tongue
German
Weight
448 KB
Volume
63
Category
Article
ISSN
0018-019X

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✦ Synopsis

Stability in Methanol and Thermodynamic Transfer Properties of the Cryptates of some Transition Cations and Heavy Metals

The nature and stability of the macrocyclic and macrobicyclic complexes of Ag^+^, Cd^2+^, and Pb^2+^ (M^n+^) with 21, 22, 211, 221 and 222 in anhydrous methanol 0.05M in Et~4~N^+^ClO^−^~4~, at 25° (see Scheme) have been determined by potentiometry and spectrophotometry. Binuclear complexes M~2~L^2n+^ have been observed in all cases, besides the mononuclear ML^n+^ complexes. The macrobicyclic 1:1 complexes ML^n+^ exhibit an important ‘cryptate effect’ with M^n+^=Ag^+^, Pb^2+^ and Cd^2+^, but not with Cu^2+^ and Zn^2+^; their stability is in all cases maximum with 221.

The applicability to our results of the recent extrathermodynamic hypothesis involving ML^n+^ cryptates is examined.

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