The effect of the tertiary amine used as electron donor was studied next, with perylene, 4CzIPN and [Ir(dtbbpy)(ppy)2]PF6 (Table , entries 3, 7, 9 and 11-16). While all three electron donors gave comparable reaction times and yields with [Ir(dtbbpy)(ppy)2]PF6, the choice of tertiary amine had an impact on the conversion rate with perylene and 4CzIPN. Tributylamine was chosen as the best electron donor as it had a faster conversion rate than triethylamine and DIPEA (Table , entries 7, 13 and 14) and provided higher yields.