Abstract
AbstractIn the context of the immobilization of technetium, as pertechnetate, from spent nuclear fuel from reprocessing activies, or potentially a scavenger for pertechnetate in repository conditions, the compound tetraphenylpyridinium pertechnetate (TPPy-TcO4) has been synthesized, structurally characterized and its solubility investigated. The compound TPPy-TcO4has been prepared by metathesis from ammonium pertechnetate and 1,2,4,6-tetraphenylpyridinium tetrafluoroborate from a water/acetone media. Diffraction measurements show that the compound crystallizes in the orthorhombic space group (Pbca) witha= 16.1242(10)Å,b= 16.7923(10)Å, andc= 17.6229(11)Å. The solubility of the salt has been investigated at room temperature in aqueous media at pH 2.22, 6.91, and 9.81 where solubility products were determined as 6.16 × 10−12, 4.13 × 10−12, and 1.16 × 10−11, respectively. The compound TPPy-TcO4is not the most insoluble pertechnetate salt reported so far, but comparatively has a lower solubility than that of most other pertechnetate salts.
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