1 WVP 5,15-bisethynyl-10,20-diphenylporphyrin containing Fe 1.000 2 WYP 5-ethynyl-10,20-diphenylporphyrin containing Fe 0.951 3 WUP 5,15-diphenylporphyrin containing Fe 0.902 4 SMU [5,15-diphenylporphyrinato(2-)-kappa~4~N~21~,N~22~,N~23~,N~24~]manganese 0.857 5 83L 10,20-diphenyl-5,15-diaza-porphyrin containing Fe 0.814 6 9D7 [4-(15-phenylporphyrin-5-yl-kappa~4~N~21~,N~22~,N~23~,N~24~)benzoato(2-)]zinc 0.800 7 WXP 5,10,15-triphenylporphyrin cpntaining Fe 0.787