Exchange of N,N-dimethylacetamide on dioxopentakis(N,N-dimethylacetamide)uranium(VI) ion. Proton magnetic resonance study

Journal Article · Wed Sep 01 04:00:00 EDT 1976 · Inorg. Chem.; (United States)

DOI:https://doi.org/10.1021/ic50163a024· OSTI ID:7248887

Bowen, R P; Lincoln, S F; Williams, E H

The species UO/sub 2/(DMA)/sup 2 +//sub 5/ is shown from /sup 1/H NMR studies to be the greatly predominant dioxouranium(VI) species existing in a series of dilute N,N-dimethylacetamide (DMA) solutions in CD/sub 2/Cl/sub 2/ diluent. Complete line shape analyses of exchange-modified /sup 1/H NMR DMA line shapes show the rate law for DMA exchange to be 5k/sub ex/(UO/sub 2/(DMA)/sup 2 +//sub 5/) over a 24.05-fold variation of (DMA). The mechanism of the DMA exchange is considered to be of the D type. A typical set of rate parameters are k/sub ex/(260 K) = 81 +- 2 s/sup -1/, ..delta..H/sup 2 +/ = 10.2 +- 0.2 kcal mol/sup -1/ and ..delta..S/sup 2 +/ = -10.4 +- 0.7 cal deg/sup -1/ mol/sup -1/ for a solution in which (UO/sub 2/(DMA)/sup 2 +//sub 5/), (DMA), and (CD/sub 2/Cl/sub 2/) are respectively 0.1518, 0.7108, and 14.15 M.

• Research Organization: Univ. of Adelaide
• OSTI ID: 7248887
• Journal Information: Inorg. Chem.; (United States), Journal Name: Inorg. Chem.; (United States) Vol. 15:9; ISSN INOCA
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
38 RADIATION CHEMISTRY, RADIOCHEMISTRY, AND NUCLEAR CHEMISTRY
400202 -- Isotope Effects
Isotope Exchange
& Isotope Separation
400702* -- Radiochemistry & Nuclear Chemistry-- Properties of Radioactive Materials
ACTINIDE COMPLEXES
BARYONS
COMPLEXES
DEUTERIUM
ELEMENTARY PARTICLES
FERMIONS
HADRONS
HYDROGEN ISOTOPES
ISOTOPE EFFECTS
ISOTOPES
LIGHT NUCLEI
MAGNETIC RESONANCE
NUCLEAR MAGNETIC RESONANCE
NUCLEI
NUCLEONS
ODD-ODD NUCLEI
PROTONS
RESONANCE
STABLE ISOTOPES
STRUCTURAL CHEMICAL ANALYSIS
URANIUM COMPLEXES