1 83L 10,20-diphenyl-5,15-diaza-porphyrin containing Fe 1.000 2 WUP 5,15-diphenylporphyrin containing Fe 0.897 3 WYP 5-ethynyl-10,20-diphenylporphyrin containing Fe 0.854 4 WVP 5,15-bisethynyl-10,20-diphenylporphyrin containing Fe 0.814 5 WXP 5,10,15-triphenylporphyrin cpntaining Fe 0.778