Complexation of actinides

With growing interest in the chemical behaviour of actinide ions in the environment (1), the complexation of these ions with carbonate anions has been recently attracting particular attention (2-10) due to the ubiquitous presence of carbonate ions in nature (11, 12) and their pronounced tendency to form complexes with heavy metal ions (7, 10-14). In spite of the carbonate complexation of actinides being considered important chemical reactions for understanding the chemistry of actinides in natural fluids, not many experiments have been devoted up to now to the quantitative study of the subject, though numerous qualitative observations are discussed in the literature. Although there are a few papers reporting the formation constants of carbonate complexes... 

Choppin, G. R. Allard, B. Complexes of actinides with naturally occurring organic compounds, Handbook on the Physies and Chemistry of the Aetinides Eds. Freeman, A. J. Keller, C. North-Holland Amsterdam, 1985, pp. 407-429. 

Table 6 Some Ammonia Complexes of Actinide(IV) Compounds...

Table 36 Complexes of Actinide(IV) Compounds with Lactams, Antipyrine (2,3-Dimethyl-l-phenylpyrazol-5-one, ATP) and its Derivatives, and Dicarboxylic Acid Amides...

Table 41 Complexes of Actinide(rV) Compounds with Arsine Oxides...

Table 51 Complexes of Actinide(V) Compounds with P-Oxides...

Jones, A.D. Choppin, G.R. Complexes of actinide ions in aqueous solution, Actinides Rev. 1 (1969)311-336. 

Olofsson, U. Allard, B. "Complexes of Actinides with Naturally Occurring Organic Substances - Literature Survey, KBS Technical Report 8309, Stockholm, Sweden, 1983. 

The hydride complexes of actinides usually contain a coligand, such as, for example, OR, dmpe, or Cp, and can be monomeric or oligomeric. Thus, the borohydrides An(BH4)4 produced according to (5.68) are polymeric (An = Th, U) or monomeric (An = Np, Pu), whereas the An(BH3Me)4 are all monomeric. Their volatility increases from Th to Pu, whereas their stability goes in the opposite direction [282] ... 

Some examples of hydride and borohydride complexes of actinides are presented in Table 5.14. 

B. Alexander, Chem. Rev. 1995, 95, 273. Macrocyclic ligand complexes of actinides and lanthanides (506 references). 

Complexation of actinides by organic compounds may also cause an increase in solubility. For example, NpO ions exhibit strong complexation by organic com-plexing agents, even in high salt concentrations. The influence of hydrolysis increases in the order MO2 < < MO2 < Whether the formation of hydroxo com-... 

G. R. Choppin, B. Allard, Complexes of Actinides with Naturally Occurring Organic Compounds, in Handbook on the Physics and Chemistry of the Actinides, Vol. 3 (Eds. A. J. Freeman, C. Keller), Elsevier, Amsterdam, 1985... 

Olofsson U. and Allard B. (1983) Complexes of actinides with naturally occurring organic substances. Literature Survey Technical. KBS Report 83-09. 

Table 18 Representative complexes of actinide(IV) compounds with iV-oxides.

Table 29 Complexes of actinide)V) compounds with P-oxides.

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