Table 1. Total energy (E_total) and interaction energy (ΔE_inter) of electron transfer from porphyrin iron to carbon materials at ambient temperatures.

system	Etotal (mean) (kcal/mol)	std. dev.a	ΔEinter (kcal/mol)
cytochrome-graphite (Fe2+)	2889.984	13.504	−4.835
cytochrome-graphite (Fe3+)	2885.149	15.693
cytochrome-CNT (Fe2+)	4615.448	15.595	−8.367
cytochrome-CNT (Fe3+)	4607.081	15.051

^astd. dev.: standard deviation.