Supporting Information Synthesis and photophysics of selective functionalized π-conjugated, blue light emitting highly fluorescent C7-imidazo indolizine derivatives Rajib Sarkar, a Tandrima Chaudhuri, b Animesh Karmakar b and Chhanda Mukhopadhyay* a a Department of Chemistry, University of Calcutta, 92 APC Road, Kolkata-700009, India E-mail: cmukhop@yahoo.co.in b Department of Chemistry, Dr. B. N. Dutta Smriti Mahavidyalaya, Burdwan-713407, India. Table of contents Absoptivity variation data S2-S3 Absorption and emission spectra of 3a, 4c and 4k in various solvents S4 Formation mechanism of tri and tetra substituted C7-imidazo indolizines S5-S6 Reference S6 1 H-NMR and 13 C-NMR spectra of 2a-2b S7-S8 1 H-NMR and 13 C-NMR spectra of 3a-3e S9-S13 1 H-NMR and 13 C-NMR spectra of 4a-4r S14-S31 1 H-NMR and 13 C-NMR spectra of 6a-6f S32-S37 1 H-NMR and 13 C-NMR spectra of 7a-7e S38-S42 S1 Electronic Supplementary Material (ESI) for Organic & Biomolecular Chemistry. This journal is © The Royal Society of Chemistry 2015