[jakse]

Good day everyone.
I'm doing a big paper on Grätzel solarcells and have stumbled upon some questions concerning the coloring. I've used blackberries with the color cyanidin-3-glucoside.
But I'm confused with what exact electron is excited in the molecule when a foton is absorbed?
Also which colors will bind to titanium(IV)oxide, TiO2, and what  characteristics do they need to have to bind to titanium(IV)oxide?
Thanks in advance
- Jakob