Synthesis and structure of U(VI), Np(VI), and Pu(VI) propionates

Peculiarities of the Supramolecular Assembly of Tetraethylammonium and 3-Bromopropionate Ions in Uranyl, Neptunyl, and Plutonyl Coordination Compounds

“…Generalized information about the features of supramolecular structures of crystals of I and V can be obtained using the method of molecular VD polyhedra. , As was already noted earlier (in particular, in refs – ), this method makes it possible to identify and characterize all noncovalent contacts, and not just those that are generally considered important or significant, without using crystal chemical radii. Because I and V contain atoms of respectively six and five elements, theoretically their crystal structures may possess respectively 21 and 15 types of A/Z intermolecular contacts, where A and Z are the symbols of elements of atoms whose VD polyhedra have a common face, with the rank of face equal to 0. , According to the data obtained, in reality, I and V realize intermolecular contacts of only eight and three types, respectively (Table ).…”

“…Over the past decades, the number of structurally characterized hexavalent actinide (An) carboxylates containing anions of monobasic saturated or unsaturated carboxylic acids has significantly increased. , Although acetate-containing complexes are the most widely represented among them, in recent years data have also emerged for propionate-containing compounds of actinides. In particular, crystal structures of [AnO 2 (prop) 2 (H 2 O) 2 ], Mg­(H 2 O) 6 [AnO 2 (prop) 3 ] 2 , and Cs 2 Ba­[AnO 2 (prop) 3 ] 4 , where prop is the anion of the propionic acid C 2 H 5 COOH, were characterized. Within each of the three mentioned series of compounds (An = U, Np, or Pu), they turned out to be isostructural regardless of the nature of An.…”

First uranyl methacrylate complexes: Synthesis and structure

“…For simplicity, Fig. 2 noted that, according to [22], UO 8 H 4 layers of the same structure as in Fig. 2 [23], or n val erate (VIII) [24]) stoichiometrically identical to I, as well as for propionates of (IX) and (X) [22] isostructural with V. Parameters of the UO 8 H 4 layer in structure I, determined by translations a and c (7.42 Å × 10.84 Å), are reasonably consistent with the metrics of the same layers in structures VI-X (~7.6(2) Å × 10.7(1) Å [22]).…”

Uranium(VI) Complexes of Glutathione Disulfide Forming in Aqueous Solution

“…There are, however, particularly for pD = 2, two absorptions in the region of interest that cannot be ascribed to vibrational modes of free GSSG, namely at 1637 and 1375 cm –1 . Referring these bands to ν as and ν s (COOU), Δν is calculated to about 260 cm –1 , a value characteristic for monodentate OCO–U­(VI) coordination. − Carboxyl–U­(VI) ligation is reported to be bidentate for carboxylates such as aliphatic acetate, propionate, , n -valerate, or aromatic benzoate and phthalate, , and even for glutamate and aspartate in case of binding by their respective side-chain carboxylate . Other amino acids such as alanine or glycine, however, show monodentate coordination in their zwitterionic form. − As the ligands’ Gly terminus acts like a conventional carboxylic acid, and while the Glu terminus constitutes a zwitterion, it is concluded that U­(VI) coordination by the Gly COO is bidentate and by the Glu COO is monodentate.…”

“…Referring these bands to ν as and ν s (COOU), Δν is calculated to about 260 cm −1 , a value characteristic for monodentate OCO−U(VI) coordination. 64−66 Carboxyl− U(VI) ligation is reported to be bidentate for carboxylates such as aliphatic acetate, 66 propionate, 67,68 n-valerate, 69 or aromatic benzoate and phthalate, 67,70 and even for glutamate and aspartate in case of binding by their respective side-chain carboxylate. 71 Other amino acids such as alanine or glycine, however, show monodentate coordination in their zwitterionic form.…”