1,2,4,5-Tetrakis(4-carboxyphenyl)benzene

Lammert, M., et al. Dalton Transactions 45.47 (2016): 18822-18826.

Two new MOFs based on 1,2,4,5-tetrakis(4-carboxyphenyl)benzene (H4TCPB) were obtained within 15 min under mild reaction conditions, denoted as M-CAU-24 (M = Zr, Ce). The MOF with the composition [M6(µ3-O)4(µ3-OH)4(OH)4(H2O)4(TCPB)2] crystallized in the scu topology, a connectivity that has not been reported so far for Zr-MOFs with tetracarboxylic acid linker molecules. Zr-CAU-24 exhibits UV/blue ligand-based luminescence.
1,2,4,5-Tetrakis(4-carboxyphenyl)benzene was first dissolved in DMF, and the corresponding metal aqueous solutions and formic acid were added. Pure products with the highest crystallinity were obtained using a short reaction time of 15 min at 100 °C under stirring. All compounds were obtained only in the form of microcrystalline powders. PXRD patterns of as-synthesized and thermally activated samples (140 °C and 10^-2 kPa) have also been obtained. Changes in the positions of reflections in the PXRD pattern were observed due to the removal of guest molecules. This change is reversible once the activated capillaries are subjected to environmental conditions.

Yu, Ting, et al. RSC advances 11.28 (2021): 17431-17436.

Three new thorium-based MOFs based on 1,2,4,5-tetrakis (4-carboxyphenyl) benzene (H4TCPB) were obtained under similar reaction systems (same metal salt, ligand, solvent and acid). Th constitutes the central unit of MOF in the form of mononuclear and binuclear clusters, respectively. All MOFs exhibit ligand-based blue luminescence under ultraviolet environment. This is the first time that multiple luminescent thorium-based MOFs based on the same ligand have been discovered.
A mixture of Th(NO3)4·5H2O (22.81 mg, 0.04 mmol), 1, 2, 4, 5-tetrakis (4-carboxyphenyl) benzene (11.17 mg, 0.02 mmol), DMF (3 mL), and triuretic acid (0.5 mL) was dissolved in a 10 mL stainless steel autoclave. The autoclave was sealed and heated at 120°C for 2 days. The pressure of the autoclave was released and heated at 120°C for another 4 days, then cooled to room temperature. Pale yellow crystals were obtained, washed with EtOH, and dried at room temperature.

Tsang, Min Ying, et al. Crystal Growth & Design 17.2 (2017): 846-857.

The synthesis and characterization of six novel coordination polymers (CPs) based on M(II) (M: Zn and Co), dicarboxylate, tricarboxylate, and tetracarboxylate linkers and two novel bipyridinol 1,7-bis{(pyridin-n'-yl)methanol}-1,7-dicarbonyl-blocked-dodecaborane (n' = 3, L1; n' = 4, L2) ligands are reported. These polycarboxylates are terephthalic acid (H2BDC), 1,3,5-benzenetricarboxylic acid (H3BTB), and 1,2,4,5-tetrakis(4-carboxyphenyl)benzene (H4TCPB). The structural description of the CPs reveals the flexibility of the carborane ligands and their ability to construct extended structures. The CPs containing Co(II), BTB, and L2 exhibit crystalline sponge-like properties toward various guest molecules, with a higher affinity for aromatic guest molecules.
[Zn2(TCPB)(L2)]·2DMF was prepared by dissolving Zn(NO3)2·6H2O (11.06 mg, 0.037 mmol), L2 (20 mg, 0.054 mmol) and 1,2,4,5-tetrakis(4-carboxyphenyl)benzene (20.8 mg, 0.037 mmol) in 2 mL of DMF/ethanol/water (2:1:1) solution and adding a drop of concentrated hydrochloric acid. The mixture was sonicated until all solids were uniformly dissolved and then heated at 80 oC for 48 hours. The pale yellow crystals were filtered and washed with DMF (14.9 mg, 67.4%).

Korolkov, Vladimir V., et al. Nature Communications 8.1 (2017): 1385.

Black phosphorus (BP) surfaces have limited stability under atmospheric conditions. Supramolecular networks stabilized by hydrogen bonds can be formed on BP, and these monolayer-thick films can passivate the BP surface and inhibit oxidation under ambient conditions. The supramolecular layers were prepared by solution deposition. The cyanuric acid melamine network aligned with phosphorus atoms to form large domains that passivated the BP surface for more than a month while also providing a stable supramolecular platform for the subsequent deposition of 1,2,4,5-tetrakis(4-carboxyphenyl)benzene to form supramolecular heterostructures.
TMA was deposited by immersing BP in a TMA solution in EtOH for 180 s. The deposition time for forming 1 CA.M monolayer was 60 s. Deposition was performed immediately after removing the top layer of BP by lift-off under ambient conditions. After deposition, the surface was blown dry with nitrogen for 1 min. 1,2,4,5-Tetrakis(4-carboxyphenyl)benzene was deposited by immersion in a 90 μM TCPB solution in EtOH. The deposition time was 20 min and the surface was dried under a stream of N2. The sample was then immediately transferred to the AFM for imaging.