Studies of fundamental properties of rutherfordium (Element 104) using organic complexing agents
- Univ. of California, Berkeley, CA (United States)
Chemical properties of rutherfordium (Rf) have been investigated with the organic ligands triisooctylamine (TIOA), tributylphosphate (TBP), and thenoyltrifluoroacetone (TTA). The TIOA studies showed that Rf behaves differently than Th and Eu and most similarly to Zr, only Zr and Rf extract from 12 M HCI. This result is further evidence that Rf is a Group 4 element. Studies with TBP showed that Rf chemical behavior differed from the other Group 4 elements. The extraction by TBP at different chloride concentrations showed that Rf at times behaves more like Pu4+ than Zr or Hf. At high chloride concentrations, Rf and Pu extraction decreased. Under the same conditions, Zr, Hf and Th extraction increased. In addition, Rf extraction by TBP was affected by hydrogen ion concentration, while Zr and Hf extraction was not. TTA extractions were used to determine the Keq, Khyd, and the ionic radius of Rf. The of Keq for Rf with TTA was calculated to be 3.18 ± 0.90. The first four log Khyd's for Rf are calculated to be -2.6 ± 0.7, -5.9 ± 1.7, -10.2 ± 2.9, and -14.5 ± 4.1. These hydrolysis constants indicate that Rf will not hydrolyze at conditions under which Zr, Hf, and Pu will. Calculations of the ionic radius were made with the log Keq for Rf derived with TTA. The ionic radius of Rf was calculated to be 91 ± 4 pm for the 6-coordinate species and 102 ± 4 pm for the 8-coordinate species. A search for the isotope 263Rf was conducted using TTA chemistry. In 300 experiments, seven SF events and no alpha events were observed in the Rf chemical fraction. The observed SF events attributed to 263Rf and had a half-life of 500 ±$$300\atop{200}$$ seconds and a production cross section of 140 ± 50 pb.
- Research Organization:
- Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
- Sponsoring Organization:
- USDOE
- DOE Contract Number:
- AC03-76SF00098
- OSTI ID:
- 10158040
- Report Number(s):
- LBL-32233; ON: DE92016925
- Resource Relation:
- Other Information: TH: Thesis (Ph.D.); PBD: Apr 1992
- Country of Publication:
- United States
- Language:
- English
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37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
ELEMENT 104
CHEMICAL PROPERTIES
CHELATING AGENTS
LIGANDS
TBP
TOA
ATOMIC RADII
ELEMENT 104 ISOTOPES
SOLVENT EXTRACTION
HYDROLYSIS
EQUILIBRIUM
400702
400105
PROPERTIES OF RADIOACTIVE MATERIALS
SEPARATION PROCEDURES