期刊
INORGANIC CHEMISTRY
卷 58, 期 23, 页码 15962-15970出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.inorgchem.9b02469
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资金
- U.S. Department of Energy (DOE), Office of Science, Office of Basic Energy Sciences [DE-AC02-05CH11231]
- Office of Science, Office of Basic Energy Sciences, U.S. DOE [DE-AC02-05CH11231]
- UC Berkeley NMR facility - NSF [CHE 9633007, CHE 82-08992]
- NIH [1S10RR016634-01, RR 02424A-01]
- China Scholarship Council
- U.S. DOE Integrated University Program
- Piano Strategico d'Ateneo 2016-18 Program at University of Udine, Italy
Thermodynamic properties of the complexation of 2,2'-(trifluoroazanediyl)bis(N,N'-dimethylacetamide) (CF(3)ABDMA) with U(VI), Nd(III), and Np(V) have been studied in 1.0 M NaNO3 at 25 degrees C. Equilibrium constants of the complexation were determined by potentiometry and spectrophotometry. In comparison with a series of structurally related amine bridged diacetamide ligands, including 2,2'-(benzylazanediyl)bis(N,N'-dimethylacetamide) (BnABDMA), 2,2'-azanediylbis(N,N'-dimethylacetamide) (ABDMA), and 2,2'-(methylazanediyl)bis(N,N'-dimethylacetamide) (MABDMA), CF(3)ABDMA forms weaker complexes with U(VI), Nd(III), and Np(V) due to the lower basicity of the center N atom in CF(3)ABDMA resulting from the attachment of the strong electron-withdrawing CF3-moiety. The complexation strength of CF(3)ABDMA with the three metal ions follows the order: UO22+ > Nd3+ > NpO2, consistent with the order of the effective charges of the metal ions. Structural information on the U(VI)/CF(3)ABDMA complexes in solution and in solid was obtained by theoretical computation, single crystal X-ray diffractometry, F-19 NMR, and electrospray ionization mass spectrometry. The structural data indicate that, similar to the three previously studied amine-bridged diacetamide ligands (BnABDMA, ABDMA, and MABDMA), the CF(3)ABDMA ligand coordinates to UO22+ in a tridentate mode, through the center nitrogen and the two amide oxygen atoms.
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