Construction of a series of rare earth metal-organic frameworks supported by thiophenedicarboxylate linker: Synthesis, characterization, crystal structures and near-infrared/visible luminescence

Abstract

Six novel rare earth metal organic-frameworks with the general formula {[RE 2 (2,5-tdc) 3 (dmso) 2 ]ÁH 2 O} n (RE = Y III , Pr III , Nd III , Sm III , Er III and Tm III ; 2,5-tdc 2À = 2,5-thiophenedicarboxylate anion; dmso = dimethylsulfoxide) were synthesized and their complete characterization, including single crystal X-ray diffraction, FTIR spectroscopy and thermal analysis (TG/DTA) are reported. Structure analysis reveals that RE III ions show distorted capped trigonal-prismatic geometry. The 2,5-tdc 2À ligands connect four RE III centers, adopting (j 1-j 1)-(j 1-j 1)-l 4 coordination mode, generating an interesting 3D network with potential application for gas adsorption. Photophysical properties were studied using excitation/emission spectra and the photoluminescence data show the near infrared (NIR) and visible (Vis) emission with the characteristic transitions: 1 D 2 ? 3 F 2 for Pr III , 4 F 3/2 ? 4 I J (J = 9/2, 11/2 and 13/2) for Nd III , 4 G 5/2 ? 6 H J (J = 5/2, 7/2, 9/2 and 11/2) for Sm III and 4 I 13/2 ? 4 I 15/2 for Er III. This study indicates that 2,5-tdc 2À ligand is able to act as a sensitizer for emission in NIR and Vis region in these ions.

Multiple Construction of a Hierarchical Nanoporous Manganese(II)-Based Metal–Organic Framework with Active Sites for Regulating N2 and CO2 Trapping

“…. The type of metal , (coordination capability and number, the metal–linker bond strength, inertness or lability, oxidation states), ligand − (type of donor group, rigidity or flexibility of the structure, angle of rotation of donor groups, and coordination modes), solvent (size, substituent and coordination mode, boiling point), reaction temperature, , pH value, and synthesis method are key factors to the physical and chemical properties of the final structures of MOFs. They have different applications for gas storage, − catalysis, − nanocarriers for drug delivery, − sensing, − antibacterial activity, , separation selectivity of gas mixtures, , and ion conductivity and transport. , The precise design and synthesis of new MOFs with the desired crystal structures are major challenges for scientists .…”

“…Fortunately, 2,5-thiophenedicarboxylic acid (H 2 TDC) as a rigid and polydentate carboxylate ligand is one of the heterocyclic acids that promotes the formation of diverse coordination modes and multidimensional networks due to an obtuse angle of the carboxylate groups (152°). It displays highly stable connectivity among several metal centers. , It also exhibits antibacterial and anticancer potentials. , There exist various methods for synthesizing MOFs, including hydrothermal, solvothermal, sonochemical, mechanochemical, microwave, solvent reflux, etc. − The sonochemical method is one of the simplest and most cost-effective and environmentally friendly methods that causes the uniform synthesis of particles in a relatively short period of time on the nanoscale. , Herein a new manganese­(II)-based MOF with an H 2 TDC linker was synthesized by a number of simple effective methods including sonochemical, solvothermal, and solvent reflux. The effects of various parameters on the morphology and yield were studied.…”

“…It displays highly stable connectivity among several metal centers. 13,42 It also exhibits antibacterial and anticancer potentials. 43,8 There exist various methods for synthesizing MOFs, including hydrothermal, solvothermal, sonochemical, mechanochemical, microwave, solvent reflux, etc.…”

Exploring the Intense Lanthanide Luminescence and High Thermal Stability in a New Mixed Eu3+/Tb3+ Organic Framework Series for Marking in Gunshot Residues

“…It was not until the beginning of the 1990s that scientists started to realize the great opportunities for MOFs, and during the following years, intense research has been devoted to these materials, with applications in device fabrication, gas storage, photocatalysis, luminescence sensing, and light emitting . In terms of definition, MOFs are hybrid porous materials that consist of inorganic and organic moieties. , These compounds are formed via the coordination of metal cations or metal clusters (Secondary Building Units, SBUs) and organic ligands having more than one coordination site . Specifically, using lanthanide ions (Ln 3+ ) in the construction of MOFs, we have so-called Lanthanide Organic Frameworks (LnOFs), widely studied due to their spectroscopic properties.…”

“…6,7 These compounds are formed via the coordination of metal cations or metal clusters (Secondary Building Units, SBUs) and organic ligands having more than one coordination site. 8 Specifically, using lanthanide ions (Ln 3+ ) in the construction of MOFs, we have so-called Lanthanide Organic Frameworks (LnOFs), widely studied due to their spectroscopic properties. These photophysical properties arise due to the intrinsic light emission of the Ln 3+ ions.…”