Structural variation in Uranyl-Phosphonate networks utilizing tetrahedral Silicon-Centered phosphonate linkers

• Published in: Inorganic chemistry communications 2023-10, Vol.156, p.111215, Article 111215
• Main Authors: Liu, Xue-Ru, Hui, Zhuang, Mu, Wen-Lei, Liu, Chao
• Format: Article
• Language: English
• Subjects: Fluorescence; Structural regulation; Uranyl-organic frameworks, Uranyl phosphates
• ISSN: 1387-7003; 1879-0259
• DOI: 10.1016/j.inoche.2023.111215

Seven novel uranyl phosphonates were successfully synthesized through hydrothermal reactions of UO22+ ions with tetrahedral Si-centered phosphonate ligands, employing additives such as alkaline reagents, N-donor templates, and transition metal ions. [Display omitted] •Tetrahedral Si-centered phosphonates have been selected to construct UOFs.•Seven uranyl phosphates with novel structure were synthesized by hydrothermal method.•The UOFs have diverse geometries as a function of pH, co-ligand and transition metal. This paper presents a study on the hydrothermal reactions between UO22+ ions and tetrahedral Si-based phosphonate ligands (HxSiPy, y = 2–4), leading to the synthesis of seven novel uranyl phosphonates with varying structural dimensions. Structural analysis of these compounds revealed distinct features. Compounds 1 and 2 exhibited infinite strip structures, formed through the alternating bridging of H4SiP2 ligands and UO6 polyhedra. On the other hand, compound 3 displayed a 3D framework comprising [(UO2)2(PO3R)2] dimers. Compounds 4–6 were synthesized using H6SiP3 ligands with three phosphate groups. Interestingly, compounds 4 and 5 shared the same skeleton composition but differed in their dimensionalities, with compound 4 adopting a 2D layered structure and compound 5 forming a 3D network. Furthermore, the introduction of Zn2+ ions led to the formation of a 3D framework in compound 6. In compound 7, the uranyl phosphonate chains were bridged by H8SiP4 ligands, resulting in the formation of a 3D network. The synthesis, structures, absorption spectra, and photoluminescence properties of these compounds were thoroughly discussed in this study.