An Ion Exchange Study of Possible Hydridized 5f Bonding in theActinides

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A study has been made of the elution behavior of curium(III), americium(III), plutonium(III), actinium(III), plutonium(IV), neptunium(IV), uraniuM(IV), thorium(IV), neptunium(V), plutonium (VI), uranium (VI), lanthanum(III), cerium(III), europium(III), ytterbium(III), ytterium(III), strontium(II), barium(II), radium(II), cesium(I) with 3.2 M, 6.2 M, 9.3 M, and 12.2 M HCl solutions from Dowex-50 cation exchange resin columns. These elutions show that in high concentrations of hydrochloric acid the actinides form complex ions with chloride ion to a much greater extent than the lanthanides. The strengths of the tripositive actinide complex ions apparently go in the order plutonium > americium> curium, although their ionic radii also decrease in ... continued below

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Diamond, R.M.; Street, Jr., K. & Seaborg, G.T. August 28, 1951.

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A study has been made of the elution behavior of curium(III), americium(III), plutonium(III), actinium(III), plutonium(IV), neptunium(IV), uraniuM(IV), thorium(IV), neptunium(V), plutonium (VI), uranium (VI), lanthanum(III), cerium(III), europium(III), ytterbium(III), ytterium(III), strontium(II), barium(II), radium(II), cesium(I) with 3.2 M, 6.2 M, 9.3 M, and 12.2 M HCl solutions from Dowex-50 cation exchange resin columns. These elutions show that in high concentrations of hydrochloric acid the actinides form complex ions with chloride ion to a much greater extent than the lanthanides. The strengths of the tripositive actinide complex ions apparently go in the order plutonium > americium> curium, although their ionic radii also decrease in this same order. To explain these results, a partial covalent character may be ascribed to the bonding in the transuranium complex ions. It is shown that a reasonable structure for such covalent bonding involves hybridization of the 5f orbitals in the actinide elements.

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  • Report No.: UCRL--1434-Rev.
  • Grant Number: DE-AC02-05CH11231
  • DOI: 10.2172/915052 | External Link
  • Office of Scientific & Technical Information Report Number: 915052
  • Archival Resource Key: ark:/67531/metadc887315

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  • August 28, 1951

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  • Sept. 22, 2016, 2:13 a.m.

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  • Nov. 3, 2016, 7:58 p.m.

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Diamond, R.M.; Street, Jr., K. & Seaborg, G.T. An Ion Exchange Study of Possible Hydridized 5f Bonding in theActinides, report, August 28, 1951; Berkeley, California. (digital.library.unt.edu/ark:/67531/metadc887315/: accessed August 19, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.