Systematics of polymeric hydrolysis constants of actinide ions

First Hexanuclear UIV and ThIV Formate Complexes – Structure and Stability Range in Aqueous Solution

“…The Fourier map of 3 also suggests the presence of electron density attributable to an H atom on the µ 3 -oxygen atom with the larger deviation, i.e., µ 3 -OH. This is the first assignment of localized µ 3 -O/µ 3 4 (µ 3 -OH) 4 ] complexes. However, the deviations of the µ 3 -oxygen groups from the M 3 plane are averaged, indicating a delocalization of µ 3 -O/µ 3 -OH.…”

“…[1,2] If the solution is oversaturated and no terminating groups are present, the polynuclear units aggregate until stable colloids are formed. [3,4] Such colloids may be highly mobile under environmental conditions as has been demonstrated for Pu IV . [5] Polynuclear U IV species can be formed by microbial activity.…”

Recent Advances in Aqueous Actinide Chemistry and Thermodynamics

“…On the basis of their previous work with monomeric actinide species, Moriyama and co-workers developed a hard-sphere model to describe systematic trends in the hydrolysis of polymeric An­(VI) species. The authors fit their model to thermodynamic data for An­(VI) selected in the NEA-TDB, and accordingly derived the unknown parameters of the model (i.e., effective charge of the actinide, effective charge of water, dielectric constant, among others).…”

Measurement and Analysis of Formation Constants of Europium with Carboxylates

“…16) By considering this energy, the systematic trend of log n for trivalent and tetravalent actinide hydroxide complexes has been explained successfully. 17,18) The repulsion energy term is introduced into the present model by following the concept of Neck et al with some simplifications. Only the repulsion between carboxyl groups is considered in the present model; the charge q of carboxyl group and neutral donors such as water molecule and amine group is to be À1 and 0, respectively.…”