This journal is © The Royal Society of Chemistry 2010 S1 ELECTRONIC SUPPLEMENTARY INFORMATION (ESI) Fluorescence Energy Transfer Efficiency in Labeled Yeast Cytochrome c: A Rapid Screen for Ion Biocompatibility in Aqueous Ionic Liquids Sheila N. Baker, a Hua Zhao, b Siddharth Pandey, c William T. Heller, a Frank V. Bright, d and Gary A. Baker* a a Chemical Sciences Division, Oak Ridge National Laboratory, Oak Ridge, TN 37931, USA b Chemistry Program, Savannah State University, Savannah, GA 31404, USA c Department of Chemistry, Indian Institute of Technology Delhi, Hauz Khas, New Delhi- 110016, India d Department of Chemistry, University at Buffalo, The State University of New York, Buffalo, New York 14260-3000, USA * Corresponding author. E-mail: bakerga1@ornl.gov Supplementary Material (ESI) for PCCP This journal is © the Owner Societies 2011