The heme is present at the active site of many proteins and enzymes, including hemoglobin, cytochromes etc. it is an iron complex of a cyclic aromatic ligand na

The heme is present at the active site of many proteins and enzymes, including hemoglobin, cytochromes etc. it is an iron complex of a cyclic aromatic ligand named porphyrin. Several metal complexes of porthyrin synthesized in the laboratory have similar absorption spectra, except that the most intense absorption band position is either red shifted or blue shifted or blue shifted around 400 nm depending on the nature of the metal ion. The origin of this most intense absorption band in these porphyrin complexes is: (a) MLCT transitions (c) d-d transitions 3. (b) LMCT transitions (d) t-T transitions