1 Structural and Photodynamic Properties of the Anti-Cancer Drug Irinotecan in Aqueous Solutions of Different pHs Maria Rosaria di Nunzio, a Yasmin Douhal, b≠ Juan Angel Organero, a Abderrazzak Douhal a* a Departamento de Química Física, Facultad de Ciencias Ambientales y Bioquímica, and INAMOL, Universidad de Castilla-La Mancha, Avenida Carlos III, S/N, 45071 Toledo, Spain b Facultad de Farmacia, Universidad de Castilla-La Mancha, Paseo de los Estudiantes, S/N, 02071 Albacete, Spain. ≠ Present address: Hospital Universitario de Getafe, Carretera de Toledo, km 12.5, 28905, Getafe (Madrid), Spain. *corresponding author: Abderrazzak.Douhal@uclm.es Phone number: +34-925-265717 Electronic Supplementary Material (ESI) for Physical Chemistry Chemical Physics. This journal is © the Owner Societies 2018