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<p>This study reports an anionic metal-organic framework (iMOF-A), {(H<sub>2</sub>pa)<sub>3</sub>[Co<sub>3</sub>(BTCA)<sub>3</sub>].6H<sub>2</sub>O}<sub><i>n</i></sub>, where H<sub>2</sub>pa. is 1,3-propylenediamonium and BTCA is 1,2,3,4-butanetetracarboxylate. The compound, based on Co<sup>2+</sup>, crystallizes in a monoclinic system, (space group I2/a) with a non-interpenetrated three-dimensional <b>pts</b> topology. Its charge balancing is achieved by H<sub>2</sub>pa cations located in the framework’s pores, which can be exchanged with Ni<sup>2+</sup> ions. The compound was characterized by single-crystal and powder X-ray diffraction, infrared spectroscopy, elemental analysis, thermogravimetric analysis, and ultraviolet-visible absorption spectroscopy. The ion-exchange properties were evaluated by substituting the propanediammonium cations with Ni<sup>2+</sup> from aqueous solution. Batch experiments assessed the framework’s effectiveness in selectively adsorbing Ni<sup>2+</sup>, considering variables like initial metal ion concentration and contact time. The results show a high affinity for Ni<sup>2+</sup> ions, attributed to the unique polymer’s structural features. This work expands the library of anionic metal-organic frameworks and provides insights into the tunable ion-exchange properties of such frameworks.</p> Graphical abstract <p>A new metal-organic framework {(H<sub>2</sub>pa)<sub>3</sub>[Co<sub>3</sub>(BTCA)<sub>3</sub>].6H<sub>2</sub>O}<sub>n</sub> exhibits ion exchange between pore diammonium cations and hard metals in aqueous solution, supported by structural and spectroscopic studies.</p> <p></p>

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An anionic-MOF based on Co2+ and an alkane tetracarboxylate ligand exhibiting Ni2+ ion-exchange behavior

  • 期刊论文

  • 发表日期：

    2025年8月7日

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  • José R. C. Ferreira,
  • Leonã S. Flores,
  • Talita V. F. Silva,
  • Gustavo A. de Castro,
  • Isabela A. A. Bessa,
  • Rafael A. de Sousa,
  • Célia M. Ronconi,
  • Natália R. S. Araujo,
  • Rita C. O. Sebastião,
  • Charlane C. Corrêa

摘要

This study reports an anionic metal-organic framework (iMOF-A), {(H2pa)3[Co3(BTCA)3].6H2O}n, where H2pa. is 1,3-propylenediamonium and BTCA is 1,2,3,4-butanetetracarboxylate. The compound, based on Co2+, crystallizes in a monoclinic system, (space group I2/a) with a non-interpenetrated three-dimensional pts topology. Its charge balancing is achieved by H2pa cations located in the framework’s pores, which can be exchanged with Ni2+ ions. The compound was characterized by single-crystal and powder X-ray diffraction, infrared spectroscopy, elemental analysis, thermogravimetric analysis, and ultraviolet-visible absorption spectroscopy. The ion-exchange properties were evaluated by substituting the propanediammonium cations with Ni2+ from aqueous solution. Batch experiments assessed the framework’s effectiveness in selectively adsorbing Ni2+, considering variables like initial metal ion concentration and contact time. The results show a high affinity for Ni2+ ions, attributed to the unique polymer’s structural features. This work expands the library of anionic metal-organic frameworks and provides insights into the tunable ion-exchange properties of such frameworks.

Graphical abstract

A new metal-organic framework {(H2pa)3[Co3(BTCA)3].6H2O}n exhibits ion exchange between pore diammonium cations and hard metals in aqueous solution, supported by structural and spectroscopic studies.