[60]Fullerene anions in aqueous solutions (EPR study)

✍ Scribed by Andrej Staško; Vlasta Brezová; Peter Rapta; Klaus-Dieter Asmus; Dirk M. Guldi

• Book ID: 103038586
• Publisher: Elsevier Science
• Year: 1996
• Tongue: English
• Weight: 581 KB
• Volume: 262
• Category: Article
• ISSN: 0009-2614
• DOI: 10.1016/0009-2614(96)01100-1

✦ Synopsis

Photochemically and electrochemically reduced [60]fullerene encapsulated in ~/-cyclodextrin ([60]fullerene/~-CD) forms in aqueous solution four radical products (T, X, A, B) identified by EPR with the following g-values and peak-to-peak widths, pp: T: gT= 2.0015, ppT=0.02 roT; X: gx = 2.0012, PPx =0,028 roT; A: gA = 2.0000, ppA=0.105 naT; B: gB = 2.01305, PPB = 0.05 mT. Radical A was also characterized with a near-IR band at 1085 nm, and assigned to [60]fullerene mono-anion, T to a [60]fullerene excited triplet state, X is possibly a primary mono-anion in the ~/-CD superstructure, and B a di-anion or an associate form of mono-anion. Like radiolytic and flash photolytic studies, the retarded reduction of carboxylic derivatives suggests the formation of aggregates.