An Organodiphosphate-Containing Polyoxoniobate Ring and Its Assembly into a Three-Dimensional Framework through Hydrogen Bonding

• Published in: Inorganic chemistry Vol. 63; no. 20; pp. 9204 - 9211
• Main Authors: Cong, Yu-Chen, Xiao, Hui-Ping, Cai, Ping-Wei, Sun, Cai, Sun, Yan-Qiong, Qi, Ming-Qiang, Li, Xin-Xiong, Zheng, Shou-Tian
• Format: Journal Article
• Language: English
• Published: United States American Chemical Society 20.05.2024
• ISSN: 0020-1669; 1520-510X
• DOI: 10.1021/acs.inorgchem.4c00741

In this work, a novel organodiphosphate-containing inorganic–organic hybrid polyoxoniobate (PONb) ring {(PO3CH2CH2PO3H)4Nb8O16}4– (Nb 8 P 8 ) has been achieved by a one-pot hydrothermal method. The ring is constructed from a tetragonal {Nb8O36} motif and four {PO3CH2CH2PO3H} ligands. Interestingly, Nb 8 P 8 can be joined together via K–H2O clusters {K2(H2O)4(OH)2} to form one-dimensional chains {[K2(H2O)4(OH)2]Nb 8 P 8 } n and further linked by {Cu­(en)2}2+ (en = ethylenediamine) complexes, resulting in a three-dimensional supramolecular framework {[Cu­(en)2]2[K2(H2O)4(OH)2]Nb 8 P 8 }·3en·H2O (1). 1 exhibits good chemical and thermal stability and has a high water vapor adsorption capacity of ≤224 cm3 g–1 (22.71 mol·mol–1) at 298 K, outperforming most of the known polyoxometalate-based materials. Impedance measurements prove that 1 can transfer protons with moderate conductivity. This study not only contributes to the structural diversity of organodiphosphate-containing PONbs and PONb rings but also provides a reference for the development of PONb-based materials with unique performance.