Dissociative Electron Attachment of Singly Bonded [60]Fullerene Dimer Studied by Laser Flash Photolysis

Abstract

Electrochemical and photochemical processes of a singly bonded C 6 0 dimer (RC 6 0 -C 0 R), where R is diethoxyphosphorylmethyl (-CH 2 P(=O)(OEt) 2 ), have been investigated using laser flash photolysis methods. Chemical reduction of RC 6 0 -C 6 0 R generated the anion of dissociated fullerene (RC 6 0 -) as a final reduction product, which is in agreement with irreversible cyclic voltammogram. Photoinduced one-electron reduction of RC 6 0 -C 6 0 R in the presence of N,N,N',N'-tetramethyl-1,4-phenylenediamine via the triplet excited state of RC 6 0 -C 6 0 R generated initially the delocalized radical anion of RC 6 0 -C 6 0 R [(RC 6 0 -C 6 0 R) . - ], which transformed into the localized radical anion [(RC 6 0 ) . - -C 6 0 R] which showed a similar transient absorption spectrum to that of the radical anion of R 2 C 6 0 . Photoexcitation of RC 6 0 -C 6 0 R in the absence of electron donor yields free radical (RC 6 0 .) via the excited state of RC 6 0 -C 6 0 R. Interactions between two RC 6 0 moieties in the ground and excited states of RC 6 0 -C 6 0 R have also been discussed.