S1 On the Questions of Non-Innocence and the Ease of Azo Reduction in Diruthenium Frameworks with a 1,8-Bis((E)-phenyldiazenyl)naphthalene-2,7-dioxido Bridge Farheen Fatima Khan, † Johannes Klein, § José Luis Priego, # Biprajit Sarkar *,§ , Reyes Jiménez- Aparicio, *,# and Goutam Kumar Lahiri *,† † Department of Chemistry, Indian Institute of Technology Bombay, Powai, Mumbai-400076, India. Email: lahiri@chem.iitb.ac.in § Institut für Chemie und Biochemie, Anorganische Chemie, Freie Universitaet Berlin, Fabeckstraße 34-36, D-14195, Berlin, Germany. Email: biprajit.sarkar@fu-berlin.de # Departamento de Química Inorgánica, Facultad de Ciencias Químicas, Universidad Complutense, Ciudad Universitaria, E-28040 Madrid, Spain