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Ligand effect on uranium isotope fractionations caused by nuclear volume effects: An ab initio relativistic molecular orbital study

机译:配体对核体积效应引起的铀同位素分馏的影响:从头开始的相对论分子轨道研究

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We have calculated the nuclear volume term (ln K_(nv)) of the isotope fractionation coefficient (ε) between ~(235)U - ~(238)U isotope pairs by considering the effect of ligand coordination in a U(IV)-U(VI) reaction system. The reactants were modeled as [UO_2 C_(l3)]~- and [UO_2 C_(l4)]~(2-) for U(VI), and UCl_4 for U(IV). We adopted the Dirac-Coulomb Hartree-Fock method with the Gaussian-type finite nucleus model. The result obtained was ln K_(nv) =0.001 90 at 308 K, while the experimentally estimated value of ln K_(nv) is 0.002 24. We also discuss how the ligand affects the value of ln K_(nv), especially for the various structures of different compounds, and different ligands within the halogen ion series (F, Cl, and Br).
机译:通过考虑U(IV)-中配体配位的影响,我们计算了〜(235)U-〜(238)U同位素对之间的同位素分馏系数(ε)的核体积项(ln K_(nv))。 U(VI)反应系统。对于U(VI),将反应物建模为[UO_2 C_(13)]〜-和[UO_2 C_(14)]〜(2-),对于U(IV),建模为UCl_4。我们采用高斯型有限核模型的Dirac-Coulomb Hartree-Fock方法。在308 K时获得的结果为ln K_(nv)= 0.001 90,而实验估算的ln K_(nv)值为0.00224。我们还讨论了配体如何影响ln K_(nv)的值,特别是对于卤素离子系列(F,Cl和Br)中不同化合物的不同结构和不同配体。

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