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<p>The influence of the nature of an organic cation (dimethylammonium (Me<sub>2</sub>NH<sub>2</sub><sup>+</sup>), diethylammonium (Et<sub>2</sub>NH<sub>2</sub><sup>+</sup>), and tetramethylammonium (Me<sub>4</sub>N<sup>+</sup>)) on the structure of the metal-organic frameworks (MOFs) was studied. The presence of organic dimethyl- or diethylammonium cations, which can act as proton donors in hydrogen bonding, in the Zn<sup>2+</sup>—fdc<sup>2−</sup>—DMF system (fdc<sup>2−</sup> is 2,5-furandicarboxylate) results in the formation of MOFs [Me<sub>2</sub>NH<sub>2</sub>]<sub>2</sub>[Zn<sub>3</sub>(fdc)<sub>4</sub>]•2DMF(<b>1</b>) and [Et<sub>2</sub>NH<sub>2</sub>]<sub>2</sub>[Zn<sub>3</sub>(fdc)<sub>4</sub>]•2DMF•2H<sub>2</sub>O (<b>2</b>), which have similar crystal structures of the anionic type and crystallize in the same space group <i>P</i>2<sub>1</sub>/<i>c</i>. By contrast, the organic cation Me<sub>4</sub>N<sup>+</sup>, which does not contain potential hydrogen-bond donors, promotes the distortion of the framework structure and the formation of a new three-dimensional (3D) anionic MOF [Me<sub>4</sub>N]<sub>2</sub>[Zn<sub>3</sub>(fdc)<sub>4</sub>]•DMF•0.5H<sub>2</sub>O (<b>3</b>) crystallizing in the space group <i>P</i>2<sub>1</sub>/<i>n</i>. Compounds <b>2</b> and <b>3</b> were characterized by single-crystal X-ray diffraction analysis, powder X-ray diffraction analysis, elemental analysis, thermogravimetry, and IR spectroscopy.</p>

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Influence of the nature of an alkylammonium cation on the structure of the metal-organic frameworks based on ZnII and 2,5-furandicarboxylate

  • 期刊论文

  • 发表日期：

    2025年7月1日

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  • A. A. Shurenkov,
  • A. A. Lysova,
  • D. G. Samsonenko,
  • V. P. Fedin

摘要

The influence of the nature of an organic cation (dimethylammonium (Me2NH2+), diethylammonium (Et2NH2+), and tetramethylammonium (Me4N+)) on the structure of the metal-organic frameworks (MOFs) was studied. The presence of organic dimethyl- or diethylammonium cations, which can act as proton donors in hydrogen bonding, in the Zn2+—fdc2−—DMF system (fdc2− is 2,5-furandicarboxylate) results in the formation of MOFs [Me2NH2]2[Zn3(fdc)4]•2DMF(1) and [Et2NH2]2[Zn3(fdc)4]•2DMF•2H2O (2), which have similar crystal structures of the anionic type and crystallize in the same space group P21/c. By contrast, the organic cation Me4N+, which does not contain potential hydrogen-bond donors, promotes the distortion of the framework structure and the formation of a new three-dimensional (3D) anionic MOF [Me4N]2[Zn3(fdc)4]•DMF•0.5H2O (3) crystallizing in the space group P21/n. Compounds 2 and 3 were characterized by single-crystal X-ray diffraction analysis, powder X-ray diffraction analysis, elemental analysis, thermogravimetry, and IR spectroscopy.