Studies of fundamental properties of rutherfordium (Element 104) using organic complexing agents

Thesis/Dissertation · Wed Apr 01 00:00:00 EST 1992

DOI:https://doi.org/10.2172/7281430· OSTI ID:7281430

Czerwinski, Kenneth R. ^[1]

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1. 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 K_eq, K_hyd, and the ionic radius of Rf. The of K_eq for Rf with TTA was calculated to be 3.18 - 0.90. The first four log K_hyd'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 K_eq 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: 7281430
• Report Number(s): LBL-32233; ON: DE92016925
• Resource Relation: Other Information: Thesis (Ph.D.)
• Country of Publication: United States
• Language: English

Related Subjects

38 RADIATION CHEMISTRY, RADIOCHEMISTRY, AND NUCLEAR CHEMISTRY
37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
ELEMENT 104
CHEMICAL PROPERTIES
ATOMIC RADII
CHELATING AGENTS
ELEMENT 104 ISOTOPES
EQUILIBRIUM
HYDROLYSIS
LIGANDS
SOLVENT EXTRACTION
TBP
TOA
AMINES
BUTYL PHOSPHATES
CHEMICAL REACTIONS
DECOMPOSITION
ELEMENTS
ESTERS
EXTRACTION
ISOTOPES
LYSIS
ORGANIC COMPOUNDS
ORGANIC PHOSPHORUS COMPOUNDS
PHOSPHORIC ACID ESTERS
RADIOISOTOPES
SEPARATION PROCESSES
SOLVOLYSIS
TRANSPLUTONIUM ELEMENTS
TRANSURANIUM ELEMENTS
400702* - Radiochemistry & Nuclear Chemistry- Properties of Radioactive Materials
400105 - Separation Procedures