Magnetism and Luminescence of a MOF with Linear Mn3 Nodes Derived from an Emissive Terthiophene-Based Imidazole Linker

Abstract

A new terthiophene-based imidazole luminophore 5,5’-(1H-thieno[3,4-d]imidazole-4,6-diyl)bis(thiophene-2-carboxylic acid) (TIBTCH2, 5) was synthesized in one step from previously reported 4,6-di(thiophen-2-yl)-1H-thieno[3,4-d]imidazole (DTTI, 4), and their photophysical properties were studied and compared accordingly. Under solvothermal conditions, reacting 5 with Mn(OAc)2 yielded a new three-dimensional metal-organic framework (MOF, 6) which was structurally defined by single-crystal X-ray diffraction. In 6, all Mn(II) ions octahedrally bind to carboxylate-O atoms to form a linear Mn3 secondary building unit (SBU) that contains three distinct coordination modes. Importantly, 6 exhibits dual functional properties of ligand-based emission and metal-based magnetic behaviors.

Synergistic Catalytic Performance of Toluene Degradation Based on Non-Thermal Plasma and Mn/Ce-Based Bimetal-Organic Frameworks

“…The peaks located at 1533 cm −1 , 1424 cm −1 , 1381 cm −1 and 1247 cm −1 could correspond to the C=O symmetric stretching, C=O asymmetric stretching, C-OH bending vibrations, and C-OH deformation vibrations of free carboxylic groups of DHTP, respectively [ 34 , 35 ], which exhibited an obvious shift from the typical infrared absorption spectrum, implying the deprotonation of carboxylic acid group to coordinate with manganese or cerium. The peak at 1187 cm −1 was indicated to be C–H in-plane of benzene ring [ 36 , 37 ]. The four catalysts had different wave numbers in this range, indicating that the coordination environment of the organic ligand DHTP in the MCDx structure changed at a certain extent [ 38 ].…”

Construction of Two Stable Co(II)-Based Hydrogen-Bonded Organic Frameworks as a Luminescent Probe for Recognition of Fe3+ and Cr2O72− in H2O

“…HOFs have attracted a significant deal of attention especially because of their broad applications, ranging from chemical sensing [ 6 ] and bioimaging [ 7 , 8 ] to lighting [ 9 ] and 3D optical storage [ 10 , 11 ]. The metal-organic frameworks (MOFs) and covalent-organic frameworks (COFs) are usually connected by coordination bonds or covalent bonds between atoms and show relatively high stabilities [ 12 , 13 , 14 , 15 , 16 , 17 , 18 , 19 , 20 ], while the HOFs are linked by weak non-covalent interactions, such as hydrogen bonds and π−π stacking interactions, and exhibit relatively low stabilities [ 21 , 22 , 23 , 24 , 25 ]. For HOFs, the solvent guests play important roles in the construction of the supermolecular network system.…”

Metal-Organic Framework Reinforced Acrylic Polymer Marine Coatings

“…The research being conducted on reticular structures that are comprised of the linkage of metal nodes and organic linkers to form crystalline, meso-porous, metal organic frameworks (MOFs), has significantly increased in the last three decades. MOFs have found extensive applications in areas such as catalysis [ 1 ], energy storage like lithium- [ 2 ] and sodium-ion batteries [ 3 ], super capacitors [ 4 ], electro-catalysts in water splitting [ 5 ], hydrogen generation from alcohols [ 6 ], hydrogen storage [ 7 ], water harvesting [ 8 ], CO 2 sequestration [ 9 ], gas separation [ 10 ], luminescence [ 11 ], sensors [ 12 ] etc. MOFs are intrinsically modular in nature, which gives researchers excellent control over structure and porosity.…”