Syntheses, Structures, and Characteristics of Three Metal Complexes Constructed Using Hexacarboxylic Acid

Abstract

In this study, three new 3D coordination polymers (CPs), {[Cd3(L)(H2O)6]·H2O}n (1), {[Cu1.5(L)0.5(bimb)1.5]·5H2O·DMF}n (2), and {[Mn1.5(H3L)(bibp)0.5(H2O)2]·3H2O}n (3) (bimb= 1,3-bis(imidazol-1-yl)benzene, bibp= 1,4-bis((4-imidazol-1-yl)benzyl)piperazine), were prepared under solvothermal or hydrothermal conditions based on a hexadentate ligand (1,3,5-triazine-2,4,6-triamine hexa-acetic acid (H6L)). Structural elucidations were carried out by IR spectra along with single-crystal X-ray diffraction analysis, while thermogravimetric analysis (TGA) (dynamic and isothermal) and XRD techniques were used for property evaluations of the polymers. Furthermore, the fluorescence properties and detection of the Fe3+ ions in 1 were tested at room temperature, and the electrochemical behavior of 2 is also stated in this article.

Thorium–Organic Framework Constructed with a Semirigid Triazine Hexacarboxylic Acid Ligand: Unique Structure with Thorium Oxide Wheel Clusters and Iodine Adsorption Behavior

“… − On one hand, compared with the rigid tricarboxylic acid ligands, it has six flexible aminodiacetate arms, which may take a variety of geometric conformations, such as syn–syn , anti–anti , and syn–anti ; − it has six carboxyl groups that may take a more abundant coordination mode with the central metal, such as monodentate, bidentate, and monobidentate, bridging, chelating, etc., resulting in a more diverse topological structure. , On the other hand, it has abundant adsorption sites such as nitrogen-rich triazine ring-containing rich nitrogens, N of NH-, which is advantageous to adsorb specific guest molecules such as iodine to promote its adsorption. H 6 TTHA ligands and transition metal ions, alkali metal ions, alkaline earth metal ions, rare earth ions, and uranyl ions have been used to construct many MOFs with diverse topological structures and have exhibited significant application in the realms of luminescence, sensing, adsorption, etc. ,,− Bruce et al prepared seven homobimetallic or heterobimetallic complexes using H 6 TTHA and metal ions such as sodium, nickel, chromium, rhodium, zinc, and potassium in a one-pot method, which is the first time heterobimetallic complexes containing H 6 TTHA ligands have been correctly characterized . Wu et al utilized H 6 TTHA to construct rare earth complexes, which have potential applications in the field of light applications and LEDs (light-emitting diodes) .…”