Vapor pressure of tetrakis(2,2,6,6-tetramethylheptane-3,5-dionato)uranium

Journal Article · Fri Jul 01 04:00:00 EDT 1977 · J. Chem. Eng. Data; (United States)

DOI:https://doi.org/10.1021/je60074a001· OSTI ID:7218694

Bedford, R G; Huss, E B

The Knudsen effusion method was used to measure the vapor pressure of tetrakis(2,2,6,6-tetramethylheptane-3,5-dionato)uranium (U(thd)/sub 4/) over the temperature range 372 to 478 K. Sublimation at these temperatures is congruent and mass spectrometry showed that the only important vapor species is the monomeric molecule. The vapor pressure is given by the equation: In P(Pa) = (18,309 +- 400)T/sup -1/ + (42.36 +- 0.6). The enthalpy and entropy of sublimation at 425 K are: ..delta..H = 152.2 +- 3.3 kJ mol/sup -1/ and ..delta..S = 256.3 +- 5 J K/sup -1/ mol/sup -1/.

• Research Organization: Univ. of California, Livermore
• OSTI ID: 7218694
• Journal Information: J. Chem. Eng. Data; (United States), Journal Name: J. Chem. Eng. Data; (United States) Vol. 22:3; ISSN JCEAA
• Country of Publication: United States
• Language: English

Related Subjects

38 RADIATION CHEMISTRY, RADIOCHEMISTRY, AND NUCLEAR CHEMISTRY
400702* -- Radiochemistry & Nuclear Chemistry-- Properties of Radioactive Materials
ACTINIDE COMPLEXES
CHELATES
COMPLEXES
ENTHALPY
ENTROPY
EVAPORATION
HIGH TEMPERATURE
MEDIUM TEMPERATURE
PHASE TRANSFORMATIONS
PHYSICAL PROPERTIES
SUBLIMATION
THERMODYNAMIC PROPERTIES
URANIUM COMPLEXES
VAPOR PRESSURE