Metalloporphyrin complexes have been under investigation for many years [l]. The early interest in these complexes resulted from their presence in a variety of biological systems. Among these are hemoglobin[2, 31, the cytochromes [4], chlorophylls [5], and the oxygenases [6]. Transition metal tetraphenylporphyrin(TPP) complexes have been used to examine model biochemical reactions. Electron transfer reactions of iron porphyrins have ...
