Nuclear Field Shift Effect in the Isotope Exchange Reaction of Chromium(III) Using a Crown Ether

AbstractLead isotopes were fractionated by the liquid-liquid extraction technique between an aqueous phase and a crown ether. After purification by ion-exchange chemistry, the 207Pb/206Pb and 208Pb/206Pb isotopic ratios were measured by multiple-collector inductively coupled plasma mass spectrometry (MC-ICP-MS). Isotope fractionations > 0.05‰ have been found. The conventional equilibrium mass-dependent isotope effect estimated by an ab initio calculation was smaller than the Pb isotope fractionation experimentally obtained. Conventional mass-dependent isotope fractionation is not a valuable explanation for our results. The nuclear field shift effect, which results from the isotopic change in the nuclear size and shape, was also estimated by an ab initio method combined with a finite nucleus model. The nuclear field shift effect calculated was in agreement with our experimental results. Therefore, this study reports the first nuclear field shift effect of Pb in an equilibrium ligand exchange reaction.

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Nuclear Field Shift Effect of Chromium(III) in Repeated Extraction Using a Crown Ether

Solvent Extraction and Ion Exchange ◽

10.1080/07366290801904905 ◽

2008 ◽

Vol 26 (2) ◽

pp. 100-112 ◽

Cited By ~ 4

Author(s):

Toshiyuki Fujii ◽

Daisuke Suzuki ◽

Hajimu Yamana

Keyword(s):

Crown Ether ◽

Nuclear Field ◽

Field Shift ◽

Shift Effect

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Isotope exchange reaction on Li2ZrO3

Journal of Nuclear Materials ◽

10.1016/s0022-3115(97)00238-9 ◽

1997 ◽

Vol 250 (1) ◽

pp. 29-35 ◽

Cited By ~ 24

Author(s):

Atsushi Baba ◽

Masabumi Nishikawa ◽

Takanori Eguchi

Keyword(s):

Exchange Reaction ◽

Isotope Exchange ◽

Isotope Exchange Reaction

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Hydrogen isotope exchange between D2 and H2O catalyzed by platinum plate

Canadian Journal of Chemistry ◽

10.1139/v89-132 ◽

1989 ◽

Vol 67 (5) ◽

pp. 857-861 ◽

Cited By ~ 1

Author(s):

Shin-Ichi Miyamoto ◽

Tetsuo Sakka ◽

Matae Iwasaki

Keyword(s):

Kinetic Model ◽

Exchange Reaction ◽

Hydrogen Isotope ◽

Isotope Exchange ◽

Reaction Rate ◽

Hydrogen Adsorption ◽

Platinum Catalyst ◽

Isotope Exchange Reaction ◽

Hydrogen Isotope Exchange ◽

Supported Platinum

The reaction rate of hydrogen isotope exchange between D2 and H2O catalyzed by platinum plate is studied. The exchange reaction is described with the kinetic model which is the modification of that for the exchange reaction catalyzed by alumina-supported platinum catalyst. For the comparison of experimental results with this model relative amount of the number of sites for hydrogen adsorption was estimated from the initial rate of hydrogen isotope exchange between H2 and D2 on the same surface. The results show that the kinetic model is applicable for the plate catalyst if the number of the sites for hydrogen absorption, which is very sensitive to the surface state of the catalyst, was estimated not from the macroscopic surface area but from our scheme. Keywords: hydrogen isotope exchange reaction, platinum plate as catalyst.

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