Scholarlink

<p>Two new anionic scandium(III)-organic frameworks based on 2,5-thiophendicarboxylate ligands have been synthesized, and their structure has been determined by the single-crystal X-ray diffraction analysis. Compound (H<sub>2</sub>NMe<sub>2</sub>)[Sc<sub>3</sub>(H<sub>2</sub>O)<sub>2</sub>(OH)<sub>2</sub>(tdc)<sub>4</sub>]·C<sub>4</sub>H<sub>8</sub>O<sub>2</sub>·H<sub>2</sub>O (<b>1</b>) (tdc<sup>2−</sup> = 2,5-thiophendicarboxylate, H<sub>2</sub>NMe<sub>2</sub><sup>+</sup> = dimethylammonium cation, C<sub>4</sub>H<sub>8</sub>O<sub>2</sub> = 1,4-dioxane) represents a two-dimensional metal-organic framework with the AAA type arrangement of layers. Compound (Hdabco)[Sc<sub>3</sub>(OH)<sub>2</sub>(tdc)<sub>4</sub>]·DMF (<b>2</b>) (dabco = 1,4-diazabicyclo[2.2.2]octane, DMF = N, N-dimethylformamide) is a three-dimensional metal-organic framework with the channels of (4⋅5) Å<sup>2</sup> occupied by guest DMF molecules and protonated dabco molecules acting as counterions. After optimizing the synthesis conditions, compound <b>2</b> has been obtained in a chemically and phase pure form and characterized by a complex of physicochemical methods of investigations such as powder X-ray diffraction, chemical and thermogravimetric analyses and IR spectroscopy. The stability of <b>2</b> in aqueous solutions, humid and dry atmosphere during at least a month has been confirmed by powder X-ray diffraction analysis. The exchange of Hdabco<sup>+</sup> cations to various metal cations in aqueous solutions has been studied using <b>2</b> as an anionic adsorbent, revealing a pronounced affinity of this MOF towards Fe(III) ions with more than 50% ion exchange rate (0.68 Fe(III) ions per one {Sc<sub>3</sub>} unit).</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Two new anionic metal-organic frameworks based on scandium(III) and 2,5-thiophenedicarboxylate ligands: synthesis, structure and application

  • 期刊论文

  • 发表日期：

    2026年3月2日

查看全文
  • Matvei A. Tomas,
  • Anna A. Lysova,
  • Evgeniya V. Polyakova,
  • Denis G. Samsonenko,
  • Danil N. Dybtsev,
  • Vladimir P. Fedin

摘要

Two new anionic scandium(III)-organic frameworks based on 2,5-thiophendicarboxylate ligands have been synthesized, and their structure has been determined by the single-crystal X-ray diffraction analysis. Compound (H2NMe2)[Sc3(H2O)2(OH)2(tdc)4]·C4H8O2·H2O (1) (tdc2− = 2,5-thiophendicarboxylate, H2NMe2+ = dimethylammonium cation, C4H8O2 = 1,4-dioxane) represents a two-dimensional metal-organic framework with the AAA type arrangement of layers. Compound (Hdabco)[Sc3(OH)2(tdc)4]·DMF (2) (dabco = 1,4-diazabicyclo[2.2.2]octane, DMF = N, N-dimethylformamide) is a three-dimensional metal-organic framework with the channels of (4⋅5) Å2 occupied by guest DMF molecules and protonated dabco molecules acting as counterions. After optimizing the synthesis conditions, compound 2 has been obtained in a chemically and phase pure form and characterized by a complex of physicochemical methods of investigations such as powder X-ray diffraction, chemical and thermogravimetric analyses and IR spectroscopy. The stability of 2 in aqueous solutions, humid and dry atmosphere during at least a month has been confirmed by powder X-ray diffraction analysis. The exchange of Hdabco+ cations to various metal cations in aqueous solutions has been studied using 2 as an anionic adsorbent, revealing a pronounced affinity of this MOF towards Fe(III) ions with more than 50% ion exchange rate (0.68 Fe(III) ions per one {Sc3} unit).