The electrochemistry and ecl o f chlorophyl l a (Chl a) have been studied in highly pur i f ied D M F solutions. Cyc l ic voltammetric and coulometric experiments demonstrate that both the radical anion, (Chl a)-., and the dianion, (Chl a)2-, are fa i r ly stable even under bulk electrolysis conditions in the absence o f proton donors and oxygen. The protonation o f ( C H I a)-. and ( C h l a)*...