A series of MOFs based on a triangular tri(4-pyridylphenyl)amine ligand combined with carboxylate or nitrate auxiliary ligands

Abstract

A series of new metal–organic frameworks (MOFs) based on a triangular tri(4-pyridylphenyl)amine (TPPA) ligand that possess novel structures and features, namely [Co₂(TPPA)₂(1,3-bdc)₂(H₂O)]_n (1); [Zn(TPPA)(1,3-bdc)]_n (2); [Zn₆(TPPA)₂(betc)(Hbetc)₂(H₂betc)(H₂O)₆·7H₂O·2DMA]_n (3) and [Cu(TPPA)(NO₃)₂(H₂O)]·2H₂O]_n (4) (1,3-H₂bdc = 1,3-benzenedicarboxylic acid, betc = 1,2,4,5-benzenetetracarboxylic dianhydride), have been synthesized under solvothermal conditions. In our work different MOFs were synthesized from different metal ions and in different solvents, leading to a variety of coordination modes and structures. In addition, the photochemical properties of compounds 1–4 and the ligands in the solid state were studied.