Crystal Structures, Thermal and Luminescent Properties of Gadolinium(III) <i>Trans</i>-1,4-cyclohexanedicarboxylate Metal-Organic Frameworks
Four new gadolinium(III) metal-organic frameworks containing 2,2′-bipyridyl (bpy) or 1,10-phenanthroline (phen) chelate ligands and <i>trans</i>-1,4-cyclohexanedicarboxylate (chdc<sup>2−</sup>) were synthesized. Their crystal structures were determined by single-crystal X-ray...
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| Autores principales: | , , , , |
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| Formato: | article |
| Lenguaje: | EN |
| Publicado: |
MDPI AG
2021
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| Materias: | |
| Acceso en línea: | https://doaj.org/article/ec5f8095da3c4379902fb6e5edc248ea |
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| Sumario: | Four new gadolinium(III) metal-organic frameworks containing 2,2′-bipyridyl (bpy) or 1,10-phenanthroline (phen) chelate ligands and <i>trans</i>-1,4-cyclohexanedicarboxylate (chdc<sup>2−</sup>) were synthesized. Their crystal structures were determined by single-crystal X-ray diffraction analysis. All four coordination frameworks are based on the binuclear carboxylate building units. In the compounds [Gd<sub>2</sub>(bpy)<sub>2</sub>(chdc)<sub>3</sub>]·H<sub>2</sub>O (<b>1</b>) and [Gd<sub>2</sub>(phen)<sub>2</sub>(chdc)<sub>3</sub>]·0.5DMF (<b>2</b>), the six-connected {Ln<sub>2</sub>(L)<sub>2</sub>(OOCR)<sub>6</sub>} blocks form a 3D network with the primitive cubic (pcu) topology. In the compounds [Gd<sub>2</sub>(NO<sub>3</sub>)<sub>2</sub>(phen)<sub>2</sub>(chdc)<sub>2</sub>]·2DMF (<b>3</b>) and [Gd<sub>2</sub>Cl<sub>2</sub>(phen)<sub>2</sub>(chdc)<sub>2</sub>]·0.3DMF·2.2dioxane (<b>4</b>), the four-connected {Ln<sub>2</sub>(L)<sub>2</sub>(X)<sub>2</sub>OOCR)<sub>4</sub>} units (where X = NO<sub>3</sub><sup>−</sup> for <b>3</b> or Cl<sup>−</sup> for <b>4</b>) form a 2D square-grid (sql) network. The solid-state luminescent properties were investigated for the synthesized frameworks. Bpy-containing compound <b>1</b> shows no luminescence, possibly due to the paramagnetic quenching by Gd<sup>3+</sup> cation. In contrast, the phenathroline-containing MOFs <b>2</b>–<b>4</b> possess yellow emission under visible excitation (λ<sub>ex</sub> = 460 nm) with the tuning of the characteristic wavelength by the coordination environment of the metal center. |
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