乙异羟肟酸与U、Np、Pu配合物的结构和热力学性质的密度泛函理论研究

采用密度泛函理论(DFT),在B3LYP/RECP/6—31G(d,p)水平对U(Ⅵ)、U(Ⅳ)、Np(Ⅳ)、Pu(Ⅳ)与乙异羟肟酸(AHA)摩尔比为1:1和1:2配合物的结构和热力学参数进行了研究。结构计算发现,M-O键键长随原子序数增加而减短,对配合物进行自然轨道分析(NBO)发现,M和AHA的摩尔比为1:1的配合物中M-O键是明显的离子键,共价成分很少,在1:2配合物中M-O键共价成分增加。对配位反应的热力学参数进行计算发现,金属离子与AHA配合物的稳定性依次为Pu(Ⅳ)〉Np(Ⅳ)〉U(Ⅳ)〉U(Ⅵ),理论计算结果与实验测量得到的稳定常数顺序一致。...

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Published in核化学与放射化学 Vol. 38; no. 6; pp. 342 - 346
Main Author 吕洪彬 左臣 晏太红 郑卫芳 吕洪彬 左臣 郑卫芳
Format Journal Article
LanguageChinese
Published 中国原子能科学研究院 放射化学研究所,北京,102413 2016
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ISSN0253-9950
DOI10.7538/hhx.2016.38.06.0342

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Summary:采用密度泛函理论(DFT),在B3LYP/RECP/6—31G(d,p)水平对U(Ⅵ)、U(Ⅳ)、Np(Ⅳ)、Pu(Ⅳ)与乙异羟肟酸(AHA)摩尔比为1:1和1:2配合物的结构和热力学参数进行了研究。结构计算发现,M-O键键长随原子序数增加而减短,对配合物进行自然轨道分析(NBO)发现,M和AHA的摩尔比为1:1的配合物中M-O键是明显的离子键,共价成分很少,在1:2配合物中M-O键共价成分增加。对配位反应的热力学参数进行计算发现,金属离子与AHA配合物的稳定性依次为Pu(Ⅳ)〉Np(Ⅳ)〉U(Ⅳ)〉U(Ⅵ),理论计算结果与实验测量得到的稳定常数顺序一致。
Bibliography:LU Hong-bin, ZUO Chen, YAN Tai-hong, ZHENG Wei-fang China Institute of Atomic Energy, P. O. Box 275(26), Beijing 102413, China
The geometry and thermodynamic properties of complexes of acetohydroxamic acid (AHA) and U, Np and Pu (1 : 1 and 2 : 1) were studied by using density functional theory (DFT) at B3LYP/RECP/6-31G(d,p) level. The structure studies show the shortening of M-O bond in complexes along with the inereasement of atomic number. NBO analysis show the M-O bonds in the complexes with the mole ratio 1-1 of M and AHA are representative ionic bonds. However, the M-O bonds in 1 : 2 complexes are partial covalent bond compo- nents. Thermodynamic property studies reveal the order of the stability of metal AHA complexes is Pu(Ⅳ)〉Np(Ⅳ)〉U(Ⅳ)〉U(Ⅳ). The experiment results are agreement with the theoretical studies.
11-2045/TL
acetohydroxamic acid; density functional theory; uranium; neptunium; plutonium
ISSN:0253-9950
DOI:10.7538/hhx.2016.38.06.0342