Electronic structure and optical properties of isolated and TiO2-grafted free base porphyrins for water oxidation: A challenging test case for DFT and TD-DFT. - Syrine Daoudi; Abderrahmane Semmeq; Michael Badawi; Xavier Assfeld; Youssef Arfaoui; Mariachiara Pastore (J. Comput. Chem., 2019)