Tuning a layer to a three-dimensional cobalt-tris(4′-carboxybiphenyl)amine framework by introducing potassium ions

Potassium Ions Induced Framework Interpenetration for Enhancing the Stability of Uranium-Based Porphyrin MOF with Visible-Light-Driven Photocatalytic Activity

“…The coordination connection can be achieved by introducing a simple metal atom or organic linker. Alkali metals have abundant coordination modes, which can effectively connect a variety of components, including ligands, clusters, and macromolecular compounds, and may be used to connect adjacent uranyl ions. − The alkali metal is connected to the oxygen of the carboxyl groups and can form a multi-metal oxygen cluster with uranyl. In the MOF structure, there is no longer a single metal atom as a metal node connecting framework, but the metal oxygen cluster bridges the organic ligands to form the framework.…”

Two cobalt metal-organic frameworks constructed from mixed ligands and their magnetic properties

“…The C values are typical for octahedral Co(II), and negative θ value indicates intracluster antiferromagnetic coupling. 31 Obviously, the configurations of Co(II) tune the magnetic anisotropy by spin-orbit coupling to contribute to the overall magnetic behavior. Similar situations have been observed in other examples.…”

“…The magnetization curves of 1 and 2 under low magnetic field flux intensities rapidly increase before slowly increasing to the values of 3.45 and 2.68 N μ B under 5 T at 2 K, indicates that 1 and 2 exhibits considerable magnetic anisotropy, which is comparable to the previously reported analogue Co3 systems with mixed ligands bridges. [28][29][30][31][32] The dynamic magnetic properties of 1 and 2 were investigated by measurements of AC magnetic susceptibility. Complexes 1 and 2 do not display any χ signal at zero static magnetic field over the frequency range of Hz 9 and 997 Hz down to 2 K. No imaginary component is observed ( Figure 6).…”

“…[7][8][9][10][11] Polycarboxylic acids and polyazo bridged ligands have been extensively employed for constructing MOFs in previous studies. 14,15 Of course, there are many factors that determine the final structures, such as the coordination geometry of metal ions, coordination mode of ligands, the ratio of metal-ligands, temperature, solvents, time of reaction and so on. [12][13][14][15] Tri(2-carboxyethyl)-isocyanurate (H 3 L 1 ), as flexible polycarboxylic acid ligand possesses many interesting characteristics: three highly flexible -CH 2 CH 2 COOH arms, three secondary functional groups (-C=O), various coordination modes, similarly aromatic and so on.…”

“…14,15 Of course, there are many factors that determine the final structures, such as the coordination geometry of metal ions, coordination mode of ligands, the ratio of metal-ligands, temperature, solvents, time of reaction and so on. [12][13][14][15] Tri(2-carboxyethyl)-isocyanurate (H 3 L 1 ), as flexible polycarboxylic acid ligand possesses many interesting characteristics: three highly flexible -CH 2 CH 2 COOH arms, three secondary functional groups (-C=O), various coordination modes, similarly aromatic and so on. The flexible tripodal multidentate carboxylate ligands, tri(2-carboxyethyl)-isocyanurate (H 3 L 1 ) was chosen based on the following consideration: (1) the multidentate H 3 L 1 ligand with highly flexible arms has conformational flexibility and can adopt different coordination modes and diverse configurations via oxygen donors; (2) the flexible H 3 L 1 ligand has unique features and may facilitate the formation of novel unusual network topologies; (3) the flexible H 3 L 1 ligand is likely to coordinate with 3d and 4f metal ions to assemble multinuclear or high-dimensional interpenetrating frameworks; [16][17][18][19][20] (4) the flexible H 3 L 1 ligand has been relatively well-known and its metal-organic frameworks has shown interesting coordination architectures.…”