A complete series of uranium(iv) complexes with terminal hydrochalcogenido (EH) and chalcogenido (E) ligands E = O, S, Se, Te (original) (raw)

Werner-Type Complexes of Uranium(III) and (IV)

Inorganic Chemistry, 2020

Transmetalation of the β-diketiminate salt [M]-[ Me nacnac Ph ] (M + = Na or K; Me nacnac Ph− = {PhNC(CH 3)} 2 CH −) with UI 3 (THF) 4 resulted in the formation of the homoleptic, octahedral complex [U(Me nacnac Ph) 3 ] (1). Green colored 1 was fully characterized by a solid-state X-ray diffraction analysis and a combination of UV/vis/NIR, NMR, and EPR spectroscopic studies as well as solid-state SQUID magnetization studies and density functional theory calculations. Electrochemical studies of 1 revealed this species to possess two anodic waves for the U(III/IV) and U(IV/V) redox couples, with the former being chemically accessible. Using mild oxidants, such as [CoCp 2 ][PF 6 ] or [FeCp 2 ][Al{OC(CF 3) 3 } 4 ], yields the discrete salts [1][A] (A = PF 6 − , Al{OC(CF 3) 3 } 4 −), whereas the anion exchange of [1][PF 6 ] with NaBPh 4 yields [1][BPh 4 ].

Synthesis and characterization of uranium (IV) complexes with various amino acids

Complexes of uranium in its IV oxidation state, using cysteine, glycine, serine and aspar-tic acid as ligands, have been synthesized. Semi-microanalysis of the complexes indicate 1:1 metal to ligand ratio for all the synthesized complexes. Infrared spectra of solid complexes have been employed to establish the groups, coordinated to the metal ion. Effective magnetic moment of the complexes were also estimated.

Sequestering uranium from seawater: binding strength and modes of uranyl complexes with glutarimidedioxime

Dalton Transactions, 2012

Glutarimidedioxime (H2A), a cyclic imide dioxime ligand that has implications in sequestering uranium from seawater, forms strong tridentate complexes with UO2 2+. The stability constants and the enthalpies of complexation for five U (VI) complexes were measured by potentiometry and microcalorimetry. The crystal structure of the 1: 2 metal/ligand complex, UO2 (HA) 2∙ H2O, was determined. The re-arrangement of the protons of the oxime groups (-CH= N-OH) and the deprotonation of the imide group (-CH- ...