Poly[[diaqua-bis-(μ(3)-3,5-dicarb-oxy-benzo-ato-κ(3)O(1):O(3):O(5))bis-(μ(3)-5-carb-oxy-ben-zene-1,3-dicarboxyl-ato-κ(3)O(1):O(3):O(5))tetrakis(methylformamide-κO)tri-man-ganese(II)] dimethyl-formamide tetra-solvate]

2D Porphyrinic Metal-Organic Frameworks Featuring Rod-Shaped Secondary Building Units

Metal-organic frameworks (MOFs) encompass a rapidly expanding class of materials with diverse potential applications including gas storage, molecular separation, sensing and catalysis. So-called 'rod MOFs', which comprise infinitely extended 1D secondary building units (SBUs), represent an underexplored subclass of MOF. Further, porphyrins are considered privileged ligands for MOF synthesis due to their tunable redox and photophysical properties. In this study, the CuII complex of 5,15-bis(4-carboxyphenyl)-10,20-diphenylporphyrin (H2L-CuII, where H2 refers to the ligand's carboxyl H atoms) is used to prepare two new 2D porphyrinic rod MOFs PROD-1 and PROD-2. Single-crystal X-ray analysis reveals that these frameworks feature 1D MnII- or CoII-based rod-like SBUs that are coordinated by labile solvent molecules and photoactive porphyrin moieties. Both materials were characterised using infrared (IR) spectroscopy, powder X-ray diffraction (PXRD) spectroscopy and thermogravimetric analysis (TGA). The structural attributes of PROD-1 and PROD-2 render them promising materials for future photocatalytic investigations.

catena-Poly[[tri-aqua-copper(II)]-μ-5-carb-oxy-benzene-1,3-di-carboxyl-ato-κ(2) O (1):O (3)]

In the title complex, [Cu(C₉H₄O₆)(H₂O)₃]_n, the Cu^II cation exhibits a distorted square-pyramidal coordination geometry involving five O atoms from two monodentate 5-carb­oxy­benzene-1,3-di­carboxyl­ate anions and three water mol­ecules. The 5-carb­oxy­benzene-1,3-di­carboxyl­ate anions bridge Cu^II cations into zigzag polymeric chains running along the b-axis direction. These chains are further linked by O—H⋯O hydrogen bonds between coordinating water mol­ecules or carboxyl groups and carboxylate groups into a three-dimensional supra­molecular architecture. In the crystal, π–π stacking is observed between parallel benzene rings of adjacent chains, the centroid–centroid distances being 3.584 (3) and 3.684 (3) Å.