SZILARD-CHALMERS REACTION WITH COPPER CHELATES

Journal Article · Sat Dec 01 04:00:00 EST 1962 · J. Chinese Chem. Soc. (Taiwan)

DOI:https://doi.org/10.1002/jccs.196200023· OSTI ID:4145765

Yeh, S; Yin, M; Chou, J

Four Cu compounds bis-acetylacetone-Cu(II) (A), bisdibenzoylmethane- Cu(II) (B), acetylacetoneethylenediimineCu(II) (C), and benzoylacetoneethylenediimine-Cu(II) (D)) were prepared. They were used as the targets for carrying out the Szilard-Chalmers process to investigate the feasibility for the enrichment of Cu/sup 64/. Both solvent extraction and reprecipitation methods were used to separate the enriched Cu /sup 64/. No enrichment was brought about in the operations with compounds A and B under the condition studied; with compounds C and D however, enrichment factors of the order of 200-400 and 70-90, respectively, were observed. To prepare C, the most effective compound, the method of McCarthy et al., with slight modifications, was used. Three g (0.05 mole) ethylenediamine was added slowly to 10 g (0.1 mole) acetylacetone to form strawcolored solid acetylacetoneethylenediamine. The solid was dissolved in water and heated to 60-70 deg C, and 6N ammonium hydroxide was added until the solution was alkaline to phenolphthalein. The red precipitate, formed when a warm solution of 0.05 mole of cupric acetate in 100 ml water was added, was purified by reprecipitation from acetone by adding water. This compound was very soluble in the common organic solvents but insoluble in water. In extractions the irradiated target was dissolved in chloroform to make a 1% target solution. When appropriate portions of the target solution of C were extracted with equal volumes of acetate buffers with vanious pH values, the enrichment factor increased rapidly from 50 to 400 as the pH of the extractant increases from 3 to 6. In the region of pH 6-10, the enrichment factor decreased slowly from 400 to 250. When enrichment factor was studied as a function of the concentration of ammonium hydroxide solution, it increased abruptly from 150 to 290 as the concentration increased from 0.0l to 0.5N. It decreased slowly from 290 to 170, when the concentration of ammonium hydroxide is further increased from 0.5 to 15N. In an attempt to improve the efficiency of enrichment of Cu/sup 64/ by the extraction method, the effect of electrolytes on the extraction process was investigated. When target solutions were extracted with equal volumes of 0.1N solutions, salts were found to be much better extractants than weak acids or weak bases. For separation of enriched Cu/sup 64/ the reprecipitation method was very much inferior to the extraction methods. The reason for the failure of A and B may be attributed to the rapid thermal exchange reaction between ruptured Cu /sup 64/ and inactive Cu atoms in the target compound. It was concluded that the O--O chelates of Cu are not suitable for the enrichment of Cu/sup 64/ by Szilard-Chalmers process, but that N-O chelates appear promising targets. N-- N chelates also give high enrichment factors (up to 420). (BBB)

• Research Organization: National Tsing Hua Univ., Hsinchu, Taiwan
• Sponsoring Organization: USDOE
• NSA Number: NSA-18-001752
• OSTI ID: 4145765
• Journal Information: J. Chinese Chem. Soc. (Taiwan), Journal Name: J. Chinese Chem. Soc. (Taiwan) Vol. Vol: 9
• Country of Publication: Country unknown/Code not available
• Language: English

Related Subjects

ACETONE
ACETYL RADICALS
ACIDITY
AMINES
BENZOYL RADICALS
CADMIUM
CADMIUM COMPOUNDS
CHELATES
CHEMISTRY
CHLOROFORM
COPPER 64
COPPER COMPLEXES
CRYOGENICS
DIAGRAMS
ELECTRIC CHARGES
ELECTRIC CONDUCTIVITY
ELECTRONS
ENERGY LEVELS
ENRICHMENT
ETHYLENE
FERMI GAS
FERMIONS
FOCK METHOD
HALL EFFECT
INTERACTIONS
LOW TEMPERATURE
MANY BODY PROBLEM
MASS NUMBER
MEASURED VALUES
METHANE
MONOCRYSTALS
NUCLEAR MODELS
NUCLEI
ORGANIC CHLORINE COMPOUNDS
ORGANIC NITROGEN COMPOUNDS
PRECIPITATION
PREPARATION
PROTONS
QUANTUM MECHANICS
RECOILS
S
SELENIDES
SELENIUM
SEMICONDUCTORS
SOLUBILITY
SOLVENT EXTRACTION
SUPERCONDUCTIVITY
SUPERFLUIDITY