Syntheses and crystal structures of coordination polymers of a porphyrin ligand bearing two pyridyl and two carboxyl moieties

Abstract

In this work, we designed and synthesized a porphyrin-based ligand, 5,15-bis(4-carboxyphenyl)-10,20-dipyridyl porphyrin, DCDPP (H4L), which bears two carboxyl and two pyridyl moieties. Coordination of Mn(II) and Zn(II) acetates with DCDPP afforded two novel coordination polymers, [MnHL]n (1) and [ZnH2L]n·nCH3COOH (2), respectively. Single crystal X-ray diffraction analyses revealed that complex 1 exhibits 2D coordination networks, which are further linked through hydrogen bonds to form a 3D network structure. In complex 2, 1D zigzag coordination chains were generated and further linked through hydrogen bonds to form a 2D structure. Interestingly, the carboxyl moieties in these complexes are noncoordinated, and the pyridyl moieties are either coordinated or noncoordinated, and the noncoordinated carboxyl and pyridyl moieties are involved in intermolecular hydrogen bonds, which are favorable for forming the hydrogen-bonded networks.