Journal of Nuclear Science and Technology, Vol. 37, No. 4, 2000: Pp. 344–348

Yoon Yul Park; Seong Yun Kim; Jung Sung Kim; Masayuki Masayuki; Hiroshi Tomiyasu; Masanobu Nogami; Yasuhisa Ikeda

doi:10.1080/18811248.2000.9714904

Journal of Nuclear Science and Technology, Vol. 37, No. 4, 2000: Pp. 344–348

Yoon Yul Park, Seong Yun Kim, Jung Sung Kim, Masayuki Masayuki, Hiroshi Tomiyasu, Masanobu Nogami, Yasuhisa Ikeda

Research output: Contribution to journal › Article › peer-review

15 Citations (Scopus)

Abstract

The structural and kinetic studies of U(VI) complex with benzamidoxime (Hba) as ligand in CD₃COCD₃ have been studied by means of ¹H and¹³ C NMR. The Hba molecule was found to coordinate to UO²⁺₂ in the form of anionic benzamidoximate (ba), and the number of ba coordinated to UO²⁺₂ was determined to be 3 by analyzing the chemical shift of ¹³C NMR signal for Hba in the presence of UO²⁺₂. The exchangerate constants (k_ex) of ba in [UO₂(ba)₃]⁻ were determinedby the NMR line-broadening method. The kinetic parameterswere obtained as follows: k_ex(25°C)=1.3×10³ s^-1, ΔH^≠ =35.8±3.5kJ·mol^-1, and ΔS^≠=-65±13.7 J·K^-1·mol^-1. The UV-visible absorption spectra of solutionscontaining UO²⁺₂ and Hba were also measured. The molar extinction coefficient of the complex wasfound to be extremely large compared with those of UO₂(L)²⁺₅ (L=unidentate oxygen donor ligands) complexes. This is due to the strong electron withdrawing of UO²⁺₂ from Hba and suggests that an interaction between UO²⁺₂ and Hba is very strong. Such a high affinity of monomericamidoxime to UO²⁺₂ reasonably explains the high adsorptivity of amidoxime resin to U(VI) species, and is considered to result in the high recovery of U(VI) species from sea water using amidoxime resin.

Original language	English
Pages (from-to)	344-348
Number of pages	5
Journal	journal of nuclear science and technology
Volume	37
Issue number	4
DOIs	https://doi.org/10.1080/18811248.2000.9714904
Publication status	Published - 2000 Apr
Externally published	Yes

Keywords

Amidoxime resin
Chelating resin
Exchange interactions
Ligands
Nuclear magnetic resonance
Resins
Uranium(VI) ion
Uranyl-benzamidoxime complex

ASJC Scopus subject areas

Nuclear and High Energy Physics
Nuclear Energy and Engineering

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@article{473439a7b7794ddba1cf775b9fefec5a,

title = "Journal of Nuclear Science and Technology, Vol. 37, No. 4, 2000: Pp. 344–348",

abstract = "The structural and kinetic studies of U(VI) complex with benzamidoxime (Hba) as ligand in CD3COCD3 have been studied by means of 1H and13 C NMR. The Hba molecule was found to coordinate to UO2+2 in the form of anionic benzamidoximate (ba), and the number of ba coordinated to UO2+2 was determined to be 3 by analyzing the chemical shift of 13C NMR signal for Hba in the presence of UO2+2. The exchangerate constants (kex) of ba in [UO2(ba)3]− were determinedby the NMR line-broadening method. The kinetic parameterswere obtained as follows: kex(25°C)=1.3×103 s-1, ΔH≠ =35.8±3.5kJ·mol-1, and ΔS≠=-65±13.7 J·K-1·mol-1. The UV-visible absorption spectra of solutionscontaining UO2+2 and Hba were also measured. The molar extinction coefficient of the complex wasfound to be extremely large compared with those of UO2(L)2+5 (L=unidentate oxygen donor ligands) complexes. This is due to the strong electron withdrawing of UO2+2 from Hba and suggests that an interaction between UO2+2 and Hba is very strong. Such a high affinity of monomericamidoxime to UO2+2 reasonably explains the high adsorptivity of amidoxime resin to U(VI) species, and is considered to result in the high recovery of U(VI) species from sea water using amidoxime resin.",

keywords = "Amidoxime resin, Chelating resin, Exchange interactions, Ligands, Nuclear magnetic resonance, Resins, Uranium(VI) ion, Uranyl-benzamidoxime complex",

author = "Park, {Yoon Yul} and Kim, {Seong Yun} and Kim, {Jung Sung} and Masayuki Masayuki and Hiroshi Tomiyasu and Masanobu Nogami and Yasuhisa Ikeda",

year = "2000",

month = apr,

doi = "10.1080/18811248.2000.9714904",

language = "English",

volume = "37",

pages = "344--348",

journal = "Journal of Nuclear Science and Technology",

issn = "0022-3131",

publisher = "Atomic Energy Society of Japan",

number = "4",

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TY - JOUR

T1 - Journal of Nuclear Science and Technology, Vol. 37, No. 4, 2000

T2 - Pp. 344–348

AU - Park, Yoon Yul

AU - Kim, Seong Yun

AU - Kim, Jung Sung

AU - Masayuki, Masayuki

AU - Tomiyasu, Hiroshi

AU - Nogami, Masanobu

AU - Ikeda, Yasuhisa

PY - 2000/4

Y1 - 2000/4

N2 - The structural and kinetic studies of U(VI) complex with benzamidoxime (Hba) as ligand in CD3COCD3 have been studied by means of 1H and13 C NMR. The Hba molecule was found to coordinate to UO2+2 in the form of anionic benzamidoximate (ba), and the number of ba coordinated to UO2+2 was determined to be 3 by analyzing the chemical shift of 13C NMR signal for Hba in the presence of UO2+2. The exchangerate constants (kex) of ba in [UO2(ba)3]− were determinedby the NMR line-broadening method. The kinetic parameterswere obtained as follows: kex(25°C)=1.3×103 s-1, ΔH≠ =35.8±3.5kJ·mol-1, and ΔS≠=-65±13.7 J·K-1·mol-1. The UV-visible absorption spectra of solutionscontaining UO2+2 and Hba were also measured. The molar extinction coefficient of the complex wasfound to be extremely large compared with those of UO2(L)2+5 (L=unidentate oxygen donor ligands) complexes. This is due to the strong electron withdrawing of UO2+2 from Hba and suggests that an interaction between UO2+2 and Hba is very strong. Such a high affinity of monomericamidoxime to UO2+2 reasonably explains the high adsorptivity of amidoxime resin to U(VI) species, and is considered to result in the high recovery of U(VI) species from sea water using amidoxime resin.

AB - The structural and kinetic studies of U(VI) complex with benzamidoxime (Hba) as ligand in CD3COCD3 have been studied by means of 1H and13 C NMR. The Hba molecule was found to coordinate to UO2+2 in the form of anionic benzamidoximate (ba), and the number of ba coordinated to UO2+2 was determined to be 3 by analyzing the chemical shift of 13C NMR signal for Hba in the presence of UO2+2. The exchangerate constants (kex) of ba in [UO2(ba)3]− were determinedby the NMR line-broadening method. The kinetic parameterswere obtained as follows: kex(25°C)=1.3×103 s-1, ΔH≠ =35.8±3.5kJ·mol-1, and ΔS≠=-65±13.7 J·K-1·mol-1. The UV-visible absorption spectra of solutionscontaining UO2+2 and Hba were also measured. The molar extinction coefficient of the complex wasfound to be extremely large compared with those of UO2(L)2+5 (L=unidentate oxygen donor ligands) complexes. This is due to the strong electron withdrawing of UO2+2 from Hba and suggests that an interaction between UO2+2 and Hba is very strong. Such a high affinity of monomericamidoxime to UO2+2 reasonably explains the high adsorptivity of amidoxime resin to U(VI) species, and is considered to result in the high recovery of U(VI) species from sea water using amidoxime resin.

KW - Amidoxime resin

KW - Chelating resin

KW - Exchange interactions

KW - Ligands

KW - Nuclear magnetic resonance

KW - Resins

KW - Uranium(VI) ion

KW - Uranyl-benzamidoxime complex

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U2 - 10.1080/18811248.2000.9714904

DO - 10.1080/18811248.2000.9714904

M3 - Article

AN - SCOPUS:0003713822

VL - 37

SP - 344

EP - 348

JO - Journal of Nuclear Science and Technology

JF - Journal of Nuclear Science and Technology

SN - 0022-3131

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