Covalency of neptunium(IV) triscyclopentadienyl compounds from Moessbauer spectra

Conference · Sun Jan 01 04:00:00 EST 1978

OSTI ID:6374227

Karraker, D. G.; Stone, J. A.

Isomer shifts measured from the /sup 237/Np Moessbauer spectra of NpCp/sub 3/OR (R = alkyl) NpCp/sub 3/R and NpCpAr (Ar = aryl) are used as a measure of the covalency in Np(IV) ligand bonding. The isomer shifts in NpCp/sub 3//sup n/Bu and NpCp/sub 3/C/sub 6/H/sub 4/C/sub 2/H/sub 5/ show a strong sigma character to the Np--/sup -n/Bu and Np--C/sub 6/H/sub 4/C/sub 2/H/sub 5/ bonds. The sigma character of Np--OR bonding is definite, but less pronounced. The comparatively low covalency in the bonding of NpCp/sub 4/ is ascribed to longer Np--C bonds in NpCp/sub 4/ than in NpCp/sub 3//sup +/ compounds. The /sup 237/Np isomer shift in Np(MeCp)Cl/sub 3/.2THF indicates that the MeCp ligand is sigma-bonded in this compound.

• Research Organization: Du Pont de Nemours (E.I.) and Co., Aiken, SC (USA). Savannah River Lab.
• DOE Contract Number: EY-76-C-09-0001
• OSTI ID: 6374227
• Report Number(s): DP-MS-78-62; CONF-781140-2
• 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 ISOTOPES
ACTINIDE NUCLEI
ALKYL RADICALS
ALPHA DECAY RADIOISOTOPES
ARYL RADICALS
CHEMICAL BONDS
COVALENCE
HEAVY NUCLEI
ISOMER SHIFT
ISOTOPES
LIGANDS
MOESSBAUER EFFECT
NEPTUNIUM 237
NEPTUNIUM ISOTOPES
NUCLEI
ODD-EVEN NUCLEI
ORGANIC COMPOUNDS
ORGANOMETALLIC COMPOUNDS
RADICALS
RADIOISOTOPES
YEARS LIVING RADIOISOTOPES