Synthesis, crystal structure and spectroscopic characterizations of porphyrin-based Mg(II) complexes – Potential application as antibacterial agent

We reported the synthesis, spectral and photophysical studies of H 2 TBrPP (5,10,15,20-tetrakis(4-bromophenyl)porphyrin), Mg(TBrPP), and the complex [Mg(TBrPP)(HIm)] ( I ) ( HIm  =  Imidazole). A detailed analysis of infrared, and proton nuclear magnetic resonance spectroscopies, mass spectrometry, and elemental analysis are in good agreement with the transformation of the free base porphyrin H 2 TBrPP to the porphyrinic Mg(II) complex and to the one involving a bonded imidazole ligand. The photophysical properties were investigated by UV–visible absorption, and emission spectroscopies. New complex I was also characterized by single crystal X-ray diffraction confirming the pentacoordination of the Mg(II) ion within a new meso -porphyrin complex, an imidazole molecule in an axial position completing the ligand sphere. Potential use of this complex as a novel antibacterial agent was also investigated.