Synthesis, Structures, and Properties of Five Metal‐Organic Frameworks Based on Oxidized 3,3′‐Azodibenzoic Acid and Different N‐Donor Ligands

Abstract

Self‐assembly of transition metal ions with different N‐donor ligands and 3,3′‐azodibenzoic acid (3,3′‐H2ADB) yielded five novel metal‐organic frameworks. All the 3,3′‐ADB2– anions got oxidized into 3,3′‐AO2DB2– and 3,3′‐AODB2– under solvothermal conditions. Compound 1 has a 3D 6‐connected pcu architecture based on [Mn3(COO)6] SBU. Compound 2 exhibits 3D threefold interpenetrating framework based on paddlewheel [Mn2(COO)4] SBU with 41263 topological configuration. Compound 3 bears zigzag double chains, which are then connected by π–π stacking interactions into 2D porous structure. Compound 4 features 2D network with self‐penetrating feature. Compound 5 exhibits a fivefold interpenetrating architecture with dia type. Magnetic measurements show that 1, 2 and 5 exhibit antiferromagnetic behavior. In addition, compound 3 displays significant adsorption towards methylene blue in aqueous solution. Thermogravimetric analyses for 1–5 and the luminescence properties of 3 and 4 have also been investigated.

Structures, fluorescence and magnetism of a series of coordination polymers driven by a tricarboxypyridine ligand

“…9, at 300 K the χ m T product was estimated as 4.19 cm 3 mol −1 K, which is lower than the value of the Mn( ii ) ion (4.37 cm 3 mol −1 K). 39 From 300 K to 70 K as the temperature decreases, the value of χ m T remains relatively stable. From 70 K with the further decrease of temperature, the χ m T value began to decrease rapidly.…”