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- Title
Stabilité dans le méthanol et propriétés thermodynamiques de transfert des cryptates de certains cations de transition et de métaux lourds.
- Authors
Spiess, Par Bernard; Arnaud-Neu, Françoise; Schwing-Weill, Marie-José
- Abstract
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+, Cd2+, and Pb2+ (Mn+) with 21, 22, 211, 221 and 222 in anhydrous methanol 0.05 M in Et4N+ClO−4, at 25° (see Scheme) have been determined by potentiometry and spectrophotometry. Binuclear complexes M2L2n+ have been observed in all cases, besides the mononuclear MLn+ complexes. The macrobicyclic 1:1 complexes MLn+ exhibit an important 'cryptate effect' with Mn+=Ag+, Pb2+ and Cd2+, but not with Cu2+ and Zn2+; their stability is in all cases maximum with 221. The applicability to our results of the recent extrathermodynamic hypothesis involving MLn+ cryptates is examined.
- Publication
Helvetica Chimica Acta, 1980, Vol 63, Issue 8, p2287
- ISSN
0018-019X
- Publication type
Article
- DOI
10.1002/hlca.19800630818