Hot atom reactions involving multivalent and univalent species. Progress report, February 1979-January 1980

Technical Report · Tue Jan 01 04:00:00 EST 1980

DOI:https://doi.org/10.2172/5619181· OSTI ID:5619181

Tang, Y N

The major progress during this period was in the study of recoil /sup 31/Si and recoil /sup 11/C reactions and in the initiation of the studies on the interaction of molecular tritium on solid surfaces. For the recoil /sup 31/Si systems, heterogeneous hydrogenation experiments have been designed to positively confirm that a major unknown product, derived from the interaction of /sup 31/Si atoms with 1,3-butadiene, is 1-silacyclopenta-2,4-diene. This compound has been shown to be very sensitive to ..gamma..-ray irradiation and to be thermally unstable at a temperature higher than 100/sup 0/C. Another recoil /sup 31/Si experiment was designed to review the mechanism of the /sup 31/Si abstraction reactions. From the fact that high yields of (/sup 31/Si)-1-fluorosilacyclopent-3-ene were obtained as a product from a mixture of PH/sub 3/ and PF/sub 3/ together with 1,3-butadiene, the stepwise abstraction mechanism is definitely much more predominant than the possible simultaneous abstraction. Other recoil /sup 31/Si works involved a detailed systematic composition study of /sup 31/SiF/sub 2/ reactions with 1,3-butadiene, some neon moderator studies, and the continuation of the studies on the reactions of /sup 31/SiF/sub 2/ and /sup 31/SiH/sub 2/ with conjugated hexadienes. By using 2-/sup 14/C-propanone and 1,3-/sup 14/C-propanone, the mechanism of solvent-free oxidative cleavage of propanone by KMnO/sub 4/ was elucidated. Information thus derived was used to degradate the /sup 11/C-labelled propadiene derived from the reactions of recoil /sup 11/C atoms with ethylene. Results indicate that 73% of the /sup 11/C-labelled propadiene was center-labelled. This value was observed to change with additives. Various mechanistic studies on the heterogeneous interactions of molecular T/sub 2/ on solid surfaces such as Pd supported on active carbon have been initiated.

• Research Organization: Texas A and M Univ., College Station (USA). Research Foundation
• OSTI ID: 5619181
• Report Number(s): DOE/ER/03898-46
• Country of Publication: United States
• Language: English

Related Subjects

38 RADIATION CHEMISTRY, RADIOCHEMISTRY, AND NUCLEAR CHEMISTRY
400701* -- Radiochemistry & Nuclear Chemistry-- Hot-Atom Chemistry
BETA DECAY RADIOISOTOPES
BETA-MINUS DECAY RADIOISOTOPES
BETA-PLUS DECAY RADIOISOTOPES
BUTADIENE
CARBON 11
CARBON ISOTOPES
CHEMISTRY
DIENES
EVEN-ODD NUCLEI
FLUORIDES
FLUORINE COMPOUNDS
HALIDES
HALOGEN COMPOUNDS
HOT ATOM CHEMISTRY
HOURS LIVING RADIOISOTOPES
HYDRIDES
HYDROCARBONS
HYDROGEN COMPOUNDS
HYDROGEN ISOTOPES
ISOTOPES
LIGHT NUCLEI
MINUTES LIVING RADIOISOTOPES
NUCLEI
ODD-EVEN NUCLEI
ORGANIC COMPOUNDS
PHOSPHORUS COMPOUNDS
PHOSPHORUS FLUORIDES
PHOSPHORUS HYDRIDES
POLYENES
RADIOCHEMISTRY
RADIOISOTOPES
RECOILS
RESEARCH PROGRAMS
SILICON 31
SILICON ISOTOPES
TRITIUM
YEARS LIVING RADIOISOTOPES