I'm working on a five organic dyads, consisting of an electron donor and electron accepter unit. I want to calculate the charge seperation and charge recombination states energies of these compounds. I got the values of three compounds with Weller's equation using redox experiments. However due to poor solubility of two of the dyads, I failed to get information form cyclovoltametry experiments. I tried to get these values by normalized absorbance and emission of CT band. But its not accurate. Is their any other way to find these energies with maximum accuracy.