Syntheses, crystal structures, photo-physical properties, antioxidant and antifungal activities of Mg(II) 4,4'-bipyridine and Mg(II) pyrazine complexes of the 5,10,15,20 tetrakis(4–bromophenyl)porphyrin

Abstract This study concerns the synthesis of 5,10,15,20-tetrakis(4-bromophenyl)porphyrin (H2TBrPP)-based magnesium(II) complexes involving 4,4′-bipyridine (4,4′-bpy) and pyrazine (pyz) ligand, for [Mg(TBrPP)(4,4′-bpy)] (1) and [Mg(TBrPP)(pyz)2] (2), respectively. New complexes 1 and 2 were characterized by single crystal X-ray diffraction, elemental analysis, infrared and nuclear magnetic resonance spectroscopies. The photo-physical properties were investigated by UV–visible absorption and emission spectroscopies. These new magnesium(II) complexes exhibit promising antifungal and antioxidant activities.