Mössbauer Studies of Some Complexes of the Undecapeptide of Cytochrome c

Complexes of cytochrome c and of an undecapeptide of the protein have been studied by means of Mössbauer spectroscopy in order to obtain information concerning the active heme site. The variation of the quadrupole splitting with the temperature permits an evaluation of the distortions from octahedral symmetry around the iron ion in the heme group, and also an estimation of the spin‐orbit constant. The effect of the different ligands such as CN − , F − , imidazol, etc. , is discussed.