摘要：

Titrimetric methods were used to measure the stabilities in water of a number of cryptates of the types (Ln/sup 3 +/(Cryp)2.1.1), (Ln/sup 3 +/(Cryp)2.2.1), and (Ln/sup 3 +/(Cryp)2.2.2), where Ln represents various lanthanide elements. The results established the stability of these trivalent lanthanide complexes relative to those of lower valences and have shown that there is only a small effect of the variation of cation size among the lanthanides.

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