A weaker donor shows higher oxidation state upon aggregation.
Longfei MaHaili PengXiaofeng LuLei LiuXiangfeng ShaoPublished in: RSC advances (2018)
The charge-transfer between TTFs and I 2 shows that the stronger donor TTF1 is in a cation radical state and the weaker donor TTF2 is neutral in solution, whereas TTF1 exists as a cation radical and TTF2 is dicationic in complexes. The dicationic and neutral states of TTF2 are reversible upon aggregation and solvation.