Water‐based Synthesis and Properties of a Scandium 1,4‐Naphthalenedicarboxylate

Abstract

A new scandium naphthalenedicarboxylate with the framework composition [Sc2(1,4‐NDC)3] (H2‐1,4‐NDC = 1,4‐naphthalenedicarboxylic acid) was obtained under hydrothermal synthesis conditions. A structure model could be developed by a combination of 3D electron diffraction measurements and computationally assisted structure determination, which was further validated by a good agreement with the experimental powder X‐ray diffraction pattern. The structure consists of isolated ScO6 octahedra interconnected by the carboxylate groups of linker molecules to form chains. These chains are connected by the naphthalene‐moieties to form a three‐dimensional framework with square‐shaped pores and the organic group pointing into the pores. Although very similar synthesis conditions were chosen, [Sc2(1,4‐NDC)3] is not isostructural to aluminum naphthalenedicarboxylate [Al(OH)(1,4‐NDC)], which crystallizes in a MIL‐53 type structure. This can be traced back to the different inorganic building units that are observed. The compound was thoroughly characterized by elemental analysis, IR spectroscopy, sorption measurements, thermogravimetric analysis and luminescence measurements. [Sc2(1,4‐NDC)3] exhibits a high thermal stability and a ligand‐based blue luminescence in the solid state at room temperature.

Construction of a series of pH stable Ca-based MOFs, their CO2 adsorption and catalytic activity

“…In the lower region, 450 cm −1 was observed due to the out-of-plane-ring vibration and the peak at 817 cm −1 is due to the out-of-plane vibration of the C–H bond. 34…”

“…In the lower region, 450 cm −1 was observed due to the out-of-plane-ring vibration and the peak at 817 cm −1 is due to the out-of-plane vibration of the C-H bond. 34 Ca-MOF-3 shows two distinct peaks at 1449 cm −1 and 1373 cm −1 , indicating the asymmetric and symmetric stretching of the COO group in the MOF but these two peaks appear at 1512 and 1416 cm −1 in the free ligand, suggesting the connectivity between the ligand and the metal. The broad peak present in the region 3500-3590 cm −1 is due to the water molecules bound to the metal centre.…”

Synthesis, supramolecular isomerism, and photoluminescence of scandium(iii) complexes with a tetrafluoroterephthalate ligand

“…This solid exhibits highly selective CO 2 capture properties. Scandium carboxylate CPs have ligand-centred photoluminescence, [13][14][15][16] with the Sc-EBTC framework showing "turn-off" fluorescence detection of nitroaromatic compounds. 16 Another outstanding element is fluorine.…”

Modulated Self-Assembly of an Interpenetrated MIL-53 Sc Metal-Organic Framework with Excellent Volumetric H2 Storage and Working Capacity

“…35,42 A further one-dimensional SBU, where ScO6 octahedra are connected by face-sharing carboxylate units, is found in [Sc2BDC3], where BDC = 1,4benzenedicarboxylate, 36,43 and an analogue linked by 1,4-naphthalenedicarboxylate. 44 These first five MOFs are all connected by the same BDC ligand, highlighting the need to carefully control reaction conditions such as time, temperature, and solvent, to select a desired phase. 40 An alternative approach to control phases is the use of modulated self-assembly, where additives such as monotopic analogues of the multitopic MOF ligand (coordination modulation) or mineral acids (pH modulation) can tune self-assembly kinetics and/or template specific SBUs to allow fine control over phase formation in complex systems.…”