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Wang JY, Mei L, Liu Y, Jin QY, Hu KQ, Yu JP, Jiao CS, Zhang M, Shi WQ. Unveiling Structural Diversity of Uranyl Compounds of Aprotic 4,4'-Bipyridine N, N'-Dioxide Bearing O-Donors. ACS OMEGA 2023; 8:8894-8909. [PMID: 36910938 PMCID: PMC9996810 DOI: 10.1021/acsomega.3c00640] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 01/31/2023] [Accepted: 02/14/2023] [Indexed: 06/18/2023]
Abstract
As an aprotic O-donor ligand, 4,4'-bipyridine N,N'-dioxide (DPO) shows good potential for the preparation of uranyl coordination compounds. In this work, by regulating reactant compositions and synthesis conditions, diverse coordination assembly between uranyl and DPO under different reaction conditions was achieved in the presence of other coexisting O-donors. A total of ten uranyl-DPO compounds, U-DPO-1 to U-DPO-10, have been synthesized by evaporation or hydro/solvothermal treatment, and the possible competition and cooperation of DPO with other O-donors for the formation of these uranyl-DPO compounds are discussed. Starting with an aqueous solution of uranyl nitrate, it is found that an anionic nitrate or hydroxyl group is involved in the coordination sphere of uranyl in U-DPO-1 ((UO2)(NO3)2(H2O)2·(DPO)), U-DPO-2 ((UO2)(NO3)2(DPO)), and U-DPO-3 ((UO2)(DPO)(μ2-OH)2), where DPO takes three different kinds of coordination modes, i.e. uncoordinated, monodentate, and biconnected. The utilization of UO2(CF3SO3)2 in acetonitrile, instead of an aqueous solution of uranyl nitrate, precludes the participation of nitrate and hydroxyl, and ensures the engagement of DPO ligands (4-5 DPO ligands for each uranyl) in a uranyl coordination sphere of U-DPO-4 ([(UO2)(CF3SO3)(DPO)2](CF3SO3)), U-DPO-5 ([UO2(H2O)(DPO)2](CF3SO3)2) and U-DPO-6 ([(UO2)(DPO)2.5](CF3SO3)2). Moreover, when combined with anionic carboxylate ligands, terephthalic acid (H2TPA), isophthalic acid (H2IPA), and succinic acid (H2SA), DPO works well with them to produce four mixed-ligand uranyl compounds with similar structures of two-dimensional (2D) networks or three-dimensional (3D) frameworks, U-DPO-7 ((UO2)(TPA)(DPO)), U-DPO-8 ((UO2)2(DPO)(IPA)2·0.5H2O), U-DPO-9 ((UO2)(SA)(DPO)·H2O), and U-DPO-10 ((UO2)2(μ2-OH)(SA)1.5(DPO)). Density functional theory (DFT) calculations conducted to probe the bonding features between uranyl ions and different O-donor ligands show that the bonding ability of DPO is better than that of anionic CF3SO3 -, nitrate, and a neutral H2O molecule and comparable to that of an anionic carboxylate group. Characterization of physicochemical properties of U-DPO-7 and U-DPO-10 with high phase purity including infrared (IR) spectroscopy, thermogravimetric analysis (TGA), and luminescence properties is also provided.
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Affiliation(s)
- Jing-yang Wang
- Fundamental
Science on Nuclear Safety and Simulation Technology Laboratory, College
of Nuclear Science and Technology, Harbin
Engineering University, Harbin 150001, China
- Laboratory
of Nuclear Energy Chemistry, Institute of
High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China
| | - Lei Mei
- Laboratory
of Nuclear Energy Chemistry, Institute of
High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China
| | - Yang Liu
- Laboratory
of Nuclear Energy Chemistry, Institute of
High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China
| | - Qiu-yan Jin
- Laboratory
of Nuclear Energy Chemistry, Institute of
High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China
- University
of Chinese Academy of Sciences, Beijing 100049, China
| | - Kong-qiu Hu
- Laboratory
of Nuclear Energy Chemistry, Institute of
High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China
| | - Ji-pan Yu
- Laboratory
of Nuclear Energy Chemistry, Institute of
High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China
| | - Cai-shan Jiao
- Fundamental
Science on Nuclear Safety and Simulation Technology Laboratory, College
of Nuclear Science and Technology, Harbin
Engineering University, Harbin 150001, China
| | - Meng Zhang
- Fundamental
Science on Nuclear Safety and Simulation Technology Laboratory, College
of Nuclear Science and Technology, Harbin
Engineering University, Harbin 150001, China
| | - Wei-qun Shi
- Laboratory
of Nuclear Energy Chemistry, Institute of
High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China
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