Two uranium coordination polymers constructed by a polycarboxylic acid: Structural variation, photoluminescent and photocatalysis properties

• Published in: Journal of solid state chemistry 2020-02, Vol.282, p.121085, Article 121085
• Main Authors: Liang, Ling-ling, Hu, Ya-qi, Zhao, Jian-she
• Format: Article
• Language: English
• Subjects: 1,3,5-Triazine-2,4,6-triamine hexaacetic acid (H6TTHA); Photocatalytic degradation; Photoluminescent properties; Rhodamine B; Uranium complex
• ISSN: 0022-4596; 1095-726X
• DOI: 10.1016/j.jssc.2019.121085

Under hydrothermal conditions, with two pH-controlled uranium complexes, [(UO2)5(H2O)3(H3O)(TTHA)(HTTHA)]·8H2O (1) and [(UO2)4(H3O)2Na(TTHA)(HTTHA)]·H2O (2) have been obtained by the reaction of uranyl acetate dihydrate, uranyl zinc acetate hexahydrate and 1,3,5-triazine-2,4,6-triamine hexaacetic acid (H6TTHA), respectively. Complex 1 possesses a penta-nuclear uranyl polymer, and all the uranyl centers exhibit seven-coordinated pentagonal bipyramidal configuration. Complex 2 demonstrates a 3D heterometallic framework and an infrequent UO–Na linkage. For the formation of the layered structure, the ligands connect the [U1U2(μ2-COO)2]n groups and the [U3Na1U4(μ2-Ouranyl)(μ2-COO)2O15]2n clusters of complex 2. H6TTHA in the two complexes demonstrates three novel coordination modes. Especially, the μ6 and μ8 coordination modes of complex 2 connecting to UVI and NaI are reported first. The solid-state fluorescence emissions display that complex 1 exhibits broad and poor resolution bands. Furthermore, the photocatalytic degradation for rhodamine B (RhB) has been displayed by the uranium coordination polymers. [Display omitted] •One of the 3D uranium-based coordination polymers demonstrates a previous unknown penta-nuclear heterometallic network with an infrequent UO–Na linkage.•The ligand H6TTHA provides three novel coordination modes, the μ6 and μ8 connection to UVI and NaI are reported first.•The photocatalytic degradation for rhodamine B (RhB) demonstrates the higher photodegradation efficiency in the presence of uranium-based complexes.