S1 Supplementary Information for A critical approach toward resonance-assistance in the intramolecular hydrogen bond interaction of 3,5-diiodosalicylic acid: A spectroscopic and computational investigation Bijan K. Paul, * Narayani Ghosh, Ramakanta Mondal, and Saptarshi Mukherjee * Department of Chemistry, Indian Institute of Science Education and Research Bhopal, Indore By-Pass Road, Bhauri, Bhopal 462 066, Madhya Pradesh, India *To whom correspondence should be addressed: bpaul@iiserb.ac.in (BKP) and saptarshi@iiserb.ac.in (SM). Electronic Supplementary Material (ESI) for Photochemical & Photobiological Sciences. This journal is © The Royal Society of Chemistry and Owner Societies 2015