Synthesis, molecular structure, spectroscopic characterization and antibacterial activity of the pyrazine magnesium porphyrin coordination polymer

•Synthesis of a new Mg(II) porphyrin polymer with the pyrazine ligand: (I).•UV–visible and fluorescence spectroscopic characterization of (I).•Cyclic voltammetry investigation of (I).•X-ray molecular structure of (I) showing CH⋅⋅⋅ intermolecular interactions.•exhibits promising antibacterial activity for Gram-(+) and (-) bacteria.