Two d¹⁰ metal–organic frameworks based on a novel semi‐rigid aromatic biscarboxylate ligand: Syntheses, structures and luminescent properties

Abstract

Two new d 10 metal-organic frameworks based on a novel semi-rigid aromatic biscarboxylate ligand, namely, [Zn (RGAA)(BPY) 1/2 ] (1) and [Cd 5 (μ 3-OH) 2 (RGAA) 4 ] (2) [H 2 RGAA = 4-(carboxymethyl)-2-ethoxybenzoic acid, BPY = 4,4 0-bipyridine], have been synthesized by the hydrothermal reaction, and characterized by Fourier transform-infrared, elemental analyses, X-ray single-crystal diffraction, powder X-ray diffraction and thermogravimetric analyses. Complex 1 displays a three-dimensional (3D) network with a (2,3,4)connected (6ˆ3.8ˆ2.10) 2 (6ˆ3) 2 (8) topology, while complex 2 exhibits a 3D framework with a (3,10)-connected (3.4.5) 2 (3ˆ4.4ˆ6.5ˆ18.6ˆ14.7ˆ2.8) topology. The luminescent properties of compounds 1 and 2 have been investigated in detail, where the emission maxima are 464 and 349 nm, respectively.

The Synthesis and Properties of a Sodium Supramolecular Crystal Network Constructed With Functional Pyrazine Sulfonic Acid

“…Among them, the sulfonate group has recently received much attention for its useful features, such as flexible coordination modes, binding preferences to metal ions, and widely bridging extension [ 15 , 16 ]. For instance, Wu and co-workers [ 17 ] used phenyl sulfonic acid, p -aminobenzene sulfonic acid, and p -methylbenzene sulfonic acid to synthesize three Co(II) coordination complexes under hydrothermal conditions. They found that the formation of hydrogen bonds and π–π stacking interactions can organize the architecture into a 3D supramolecular topology by connecting discrete molecules.…”

The Length of Substituents on Ligands Regulates the Structural Diversity of Coordination Polymers

“…It is worth noting that the rational selection of organic ligands or coligands according to their lengths, rigidities, coordination modes and functional groups may provide the controllable CPs [14][15][16][17]. In various types of organic ligands, rigid ligands generally have conjugated systems and its structure is fixed; flexible ligands have complex structures and can rotate; semi-rigid ligands have the advantages of both rigid and flexible ligands, so they are favored by researchers in the synthesis of CPs [18,19]. Nitrogen-containing ligands are a great variety and can be as an excellent hydrogen bond receptor [20,21].…”