Tuning photosensitized singlet oxygen generation efficiency of novel Aza-BODIPY dyes

• Authors: Nagappanpillai Adarsh, Rekha R. Avirah, and Danaboyina Ramaia; Photosciences and Photonics, Chemical Sciences and Technology Division, National Institute for Interdisciplinary Science and Technology, CSIR, Trivandrum -695 019, Kerala, India
• Journal: Organic Letters, 12 (24), pp 5720–5723, November 19, 2010
• Abstract: Novel aza-BODIPY derivatives substituted with heavy atoms such as bromine and iodine were synthesized, and their triplet and singlet oxygen generation efficiencies have been investigated. These derivatives showed absorption in the NIR region with high molar extinction coefficients. The dye substituted with four iodine atoms showed yields of ΦT = 0.78 and Φ(1O2) = 0.70, which are the highest values so far obtained for the aza-BODIPY derivatives.