Electronic Supplementary Information (ESI) Water Exchange Reaction of a Manganese Catalase Mimic: Oxygen-17 NMR Relaxometry Study on (aqua)manganese(III) in Salen Scaffold and its reactions in mildly basic medium V. Rao Mundlapati a,b , Priyambada Jena c , Achyut N. Acharya c , Akshaya K Kar d , Anadi C. Dash d * and Himansu S. Biswal a,b * a School of Chemical Sciences, National Institute of Science Education and Research (NISER), Institute of Physics Campus, Bhubaneswar 751 005, India. E-mail: himansu@niser.ac.in b Homi Bhabha National Institute, Training School Complex, Anushakti Nagar, Mumbai 400094, India c Department of Chemistry, College of Engineering and Technology, Bhubaneswar 751003, India. E-mail: aacharya@cet.edu.in d Department of Chemistry, Utkal University, Bhubaneswar 751004, India. E-mail: acdash41@gmail.com Electronic Supplementary Material (ESI) for RSC Advances. This journal is © The Royal Society of Chemistry 2016