Structures and Uranium-Uranium Multiple Bond of Binuclear Divalent Uranium Complex of Pyrrolic Schiff-base Macrocycle: a Relativistic DFT Probe

doi:10.6023/A17010008

Acta Chim. Sinica ›› 2017, Vol. 75 ›› Issue (5): 457-463.DOI: 10.6023/A17010008 Previous Articles Next Articles

Article

二价双核铀聚吡咯配合物结构设计和铀-铀多重键的理论研究

陈方园^a, 曲宁^a, 吴群燕^b, 张红星^c, 石伟群^b, 潘清江^a

a. 黑龙江大学功能无机材料化学教育部重点实验室化学化工与材料学院哈尔滨 150080;
b. 中国科学院高能物理研究所核能放射化学实验室北京 100049;
c. 吉林大学理论化学研究所长春 130023

投稿日期:2017-01-09 发布日期:2017-04-01
通讯作者: 潘清江, 石伟群 E-mail:panqjitc@163.com;shiwq@ihep.ac.cn
基金资助:
项目由国家自然科学基金（Nos.21273063，21477130）和黑龙江省留学回国人员科技项目择优资助.

Structures and Uranium-Uranium Multiple Bond of Binuclear Divalent Uranium Complex of Pyrrolic Schiff-base Macrocycle: a Relativistic DFT Probe

Chen Fangyuan^a, Qu Ning^a, Wu Qunyan^b, Zhang Hongxing^c, Shi Weiqun^b, Pan Qingjiang^a

a. Key Laboratory of Functional Inorganic Material Chemistry of Education Ministry, School of Chemistry and Materials Science, Heilongjiang University, Harbin 150080;
b. Laboratory of Nuclear Energy Chemistry, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China;
c. Institute of Theoretical Chemistry, Jilin University, Changchun 130023

Received:2017-01-09 Published:2017-04-01
Contact: 10.6023/A17010008 E-mail:panqjitc@163.com;shiwq@ihep.ac.cn
Supported by:
Project supported by the National Natural Science Foundation of China (Nos. 21273063, 21477130) and the Scientific Foundation of Heilongjiang Province for the Returned Overseas Chinese Scholars.

1. Structures and Uranium-Uranium Multiple Bond of Binuclear Divalent Uranium Complex of Pyrrolic Schiff-base Macrocycle: a Relativistic DFT Probe.PDF(1313KB)

Abstract

Although attempts to synthesize divalent uranium molecules were begun three decades ago, molecular U(II) species isolable in solution have been not achieved until recent years. In 2013, Evans and co-workers synthesized the first U(II) complex, [U(Cp')₃]·[K(2,2,2-cryptand)] (Cp'=C₅H₄SiMe₃) via flash reduction, that was suitable for X-ray crystal diffraction characterization. A year later, the group of Meyer obtained another divalent uranium complex, [U((^Ad,MeArO)₃mes)]·[K(2,2,2-cryptand)] employing their particularly interesting tris(aryloxide) arene ligand. The 5f³6d¹ and 5f⁴ ground states were assigned to these two complexes, respectively, by the jointed experimental/theoretical studies. It was demonstrated that the ligand significantly affect the nature of the ground state of divalent uranium complex by tuning the energetic separation of the 5f and 6d orbitals. Therefore, careful selection of ligand makes it possible to have access to +II oxidation state of uranium and prepare new U^II complex. A flexible octadentate polypyrrollic Schiff-base macrocycle (H₄L) has been developed to complex a variety of metals such as actinides, rare earth and transition metals that show a wide range of size and diverse oxidation states. Both mono- and bimetallic complexes featured with an intriguing “Pacman-like” structure were obtained. For example, the reaction of H₄L with a trivalent uranium precursor [(U^III)I₃(THF)₄] yielded a neutral [(U^IV)(L)] complex, where the uranium ion was determined by the single crystal X-ray diffraction to be situated inside the ligand mouth and held by eight nitrogen atoms together. The +IV oxidation state was assigned to the uranium by presuming dihydrogen elimination. Considering the flexibility, tetravalent-anion nature as well as capability of accommodating bimetallic ions and stabilizing various oxidation states of uranium (e.g. III~VI complexes have been found so far) that the polypyrrolic ligand has exhibited in previously synthesized complexes, two divalent uranium ions would be likely complexated by the ligand to generate a complex, [(U^II)₂(L)]. In addition to enriching the coordination chemistry of U(II), it is also a good example to explore electronic structures of the low-valent uranium complex and unravel the uranium-uranium multiple bonding nature. Although many theoretical studies have explored uranium complexes, the study focusing on the divalent diuranium complex of a single macrocyclic ligand remains rare. In the work, a relativistic density functional theory has been employed to investigate [(U^II)₂(L)]. The structures in electron spin states (singlet, triplet, quintet, septet and nonet) were optimized. Short distances of U—U (2.32~2.67 Å), large bond order (2.95~3.90) and high stretching vibrational frequencies (180~263 cm^-1) were calculated. Energetic calculations find that its triplet state is the ground state. It has the electronic configuration of π⁴σ²δ², primarily contributed by U(5f) character. Structural and molecular-orbital analyses suggest a slightly weak uranium-uranium quadruple bond, which is confirmed by the quantum theory of atoms in molecule (QTAIM) calculations. Further comparison with analogues [(U^III)₂(L)]²⁺ and [(U^IV)₂(L)]⁴⁺ was also addressed. It is found that the uranium oxidation state is able to tune the energetic matching between the highest-energy occupied orbital of ligand and the adjacent low-energy metal-based orbital, as well as correlates with the electron transfer between metal and ligand and the diuranium multiple bond number.

Key words: bimetallic U^II polypyrrolic complexes, electronic structures, diuranium multiple bond, QTAIM, relativistic DFT

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Chen Fangyuan, Qu Ning, Wu Qunyan, Zhang Hongxing, Shi Weiqun, Pan Qingjiang. Structures and Uranium-Uranium Multiple Bond of Binuclear Divalent Uranium Complex of Pyrrolic Schiff-base Macrocycle: a Relativistic DFT Probe[J]. Acta Chim. Sinica, 2017, 75(5): 457-463.

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二价双核铀聚吡咯配合物结构设计和铀-铀多重键的理论研究

Structures and Uranium-Uranium Multiple Bond of Binuclear Divalent Uranium Complex of Pyrrolic Schiff-base Macrocycle: a Relativistic DFT Probe

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