Actinide sulfoxide complexes

Studies of sulfoxide complexes of other actinide elements have appeared, (38, 40), but insufficient data are available to make any meaningful comparisons along the series. Work on the solvent extraction of actinide elements by sulfoxides has been reported (423). 

Table 42 Complexes of Actinide(IV) Compounds with Sulfoxides...

Acoustic emission diazine metal complexes, 80 Acrylonitrile metal complexes, 263 Actinide complexes cupferron, 510 dimethyl sulfoxide IR spectra, 490 phosphines SHAB theory, 1040 phthalocyanines, 864 thiocyanates, 236 Actins, 973 Acylates H3-ligands... 

Like other actinide tetrahalides, protactinium tetrachloride and tetrabromide form stable complexes with phosphine oxides (48, 55) and iV jAT -dimethylacetamide (24), but the tetrachloride-dimethyl sulfoxide... 

The actinide tetrachloride-DMSO complexes are particularly interesting (18). There is a pronounced change in stability proceeding along the actinide series with 1 5 complexes being the most stable for thorium and protactinium and the 1 3 complexes for the remaining actinides. The 1 7 complex could not be obtained pure with thorium tetrachloride and under the preparative conditions required, namely, recrystallization from hot dimethyl sulfoxide, protactinium(IV) was oxidized. The solid 1 5 and 1 3 protactinium tetrachloride compounds are, in fact, unstable in dry nitrogen, behavior which contrasts markedly with the stability of the tetrahalide-phosphine oxide and DMA complexes. 

Table 20 Complexes of actinide(IV) compounds with sulfoxides.

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