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Meng L, Liang YY, Mei L, Geng JS, Hu KQ, Yu JP, Wang XP, Fujita T, Chai ZF, Shi WQ. Mixed-Ligand Uranyl Squarate Coordination Polymers: Structure Regulation and Redox Activity. Inorg Chem 2021; 61:302-316. [PMID: 34908402 DOI: 10.1021/acs.inorgchem.1c02872] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
The electron-rich squarate ion (C4O42-, SA2-) possesses electronic delocalization over the entire molecule and good redox activity, and the functionalization of metal-organic complexes with the SA2- group is desirable. In this work, a mixed-ligand method is used to construct novel uranyl squarate coordination polymers utilizing 4,4'-bipyridine (bpy), 4,4'-bipyridine-N,N'-dioxide (bpydo), 1,10-phenanthroline (phen), 4,4'-vinylenedipyridine (vidpy), and in situ formed oxalate (OA2-) as ancillary ligands. Seven mixed-ligand uranyl compounds, [(UO2)(OH)(SA)](Hbpy) (1), [(UO2)(H2O)(SA)2](H2bpy) (2), (UO2)(H2O)(SA)(bpydo)·2H2O (3), (UO2)(H2O)(SA)(phen)·H2O (4), (UO2)(OH)(SA)0.5(phen)·H2O (5), [(UO2)(SA)(OA)0.5](Hphen) (6), and [(UO2)(SA)(OA)0.5](Hvidpy) (7), with varying crystal structures were synthesized under hydrothermal conditions. Compound 1, together with bpy molecules filling in the interlayer space as template agents, has a two-dimensional (2D) network structure, while 2 gives a one-dimensional (1D) chain based on mononuclear uranium units. Compound 3 shows a neutral 2D network through the combined linkage of SA2- and bpydo. Both 4 and 5 have a similar chain-like structure due to the capping effect of phen motifs, while phen molecules in 6 act as templating agents after protonation. Similar to 6, compound 7 has a "sandwich-like" structure in which the Hvidpy motifs locate in the voids of layers of 2D uranyl-squarate networks. The redox properties of typical mixed-ligand uranyl-squarate compounds, 1, 4, and 5 with high phase purity, are characterized using cyclic voltammetry. All three of these uranyl coordination compounds show anode peaks (Ea) at 0.777, 0.804, and 0.760 V, respectively, which correspond to the oxidation process of SA2- → SA. Meanwhile, cathodic peaks (Ec) at -0.328, -0.315, and -0.323 V corresponding to the reduction process of U(VI) → U(V) are also observed. The results reveal that all three of these uranyl coordination compounds show good redox activity and, most importantly, the interplay between two different redox-active motifs of SA2- organic linker and uranyl node. This work enriches the library of redox-active uranyl compounds and provides a feasible mixed-ligand method for regulating the synthesis of functional actinide compounds.
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Affiliation(s)
- Liao Meng
- Guangxi Key Laboratory of Processing for Non-ferrous Metals and Featured Materials, College of Chemistry and Chemical Engineering, Guangxi University, Nanning 530004, China.,Laboratory of Nuclear Energy Chemistry, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China
| | - Yuan-Yuan Liang
- 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
| | - Jun-Shan Geng
- Laboratory of Nuclear Energy Chemistry, Institute of High Energy Physics, 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
| | - Xin-Peng Wang
- Guangxi Key Laboratory of Processing for Non-ferrous Metals and Featured Materials, College of Chemistry and Chemical Engineering, Guangxi University, Nanning 530004, China
| | - Toyohisa Fujita
- Guangxi Key Laboratory of Processing for Non-ferrous Metals and Featured Materials, College of Chemistry and Chemical Engineering, Guangxi University, Nanning 530004, China
| | - Zhi-Fang Chai
- Laboratory of Nuclear Energy Chemistry, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China.,Engineering Laboratory of Advanced Energy Materials, Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo 315201, 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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Babaryk AA, Contreras Almengor OR, Cabrero-Antonino M, Navalón S, García H, Horcajada P. A Semiconducting Bi 2O 2(C 4O 4) Coordination Polymer Showing a Photoelectric Response. Inorg Chem 2020; 59:3406-3416. [PMID: 32077286 DOI: 10.1021/acs.inorgchem.9b03290] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
Inorganic semiconductors are extensively considered to be among the most promising materials to convert solar light into electricity or chemical energy owing to their efficiency in the separation of photoinduced electron/hole. Bismuth oxides, and, in particular, those built up of [Bi2O2]2+ layers, show an efficient charge separation and, thus, high photocatalytic activities. To explore a possible synergetic effect of bismuth metallic nodes combined with the electron-rich linker squarate, Bi2O2(C4O4) or IEF-3 (an IMDEA Energy framework) was hydrothermally prepared and adequately characterized. As determined from the X-ray structure, [Bi2O2]2+ layers are interconnected by squarate ligands, having a pronounced effect of the 6s2 lone pair on the bismuth local environment. IEF-3 shows high thermal and chemical robustness at industrially relevant model aggressive media. A large panel of physicochemical methods were applied to recognize IEF-3 as an UV-absorbing n-type semiconductor, showing a photocurrent response comparable to that of α-Bi2O3, offering further possibilities for tuning its electrochemical properties by modifying the ligand. In this way, the well-known compositional and structural versatility of coordination polymers may be applied in the future to fine-tune metal-organic semiconductor systems.
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Affiliation(s)
- Artem A Babaryk
- Advanced Porous Materials Unit, IMDEA Energy Institute. Avenida Ramón de la Sagra 3, 28935 Móstoles-Madrid, Spain
| | - Oscar R Contreras Almengor
- Advanced Porous Materials Unit, IMDEA Energy Institute. Avenida Ramón de la Sagra 3, 28935 Móstoles-Madrid, Spain
| | - María Cabrero-Antonino
- Departamento de Química, Universitat Politècnica de València, c/Camino de Vera s/n, 46022 Valencia, Spain
| | - Sergio Navalón
- Departamento de Química, Universitat Politècnica de València, c/Camino de Vera s/n, 46022 Valencia, Spain
| | - Hermenegildo García
- Departamento de Química and Instituto de Tecnología Química (CSIC-UPV), Universitat Politècnica de València, c/Camino de Vera s/n, 46022 Valencia, Spain
| | - Patricia Horcajada
- Advanced Porous Materials Unit, IMDEA Energy Institute. Avenida Ramón de la Sagra 3, 28935 Móstoles-Madrid, Spain
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