π-mers and π-dimers: Two Radical Supramolecular Interactions - A Tutorial Review.

In this review, the difference between π-mers (pimers) and π-dimers (pi-dimers) will be discussed. Often interchanged or confused in the literature, these two radical interactions lead to different or even opposite physico-chemical behaviors. This review aims at clarifying the terms π-mers and π-dimers and at describing their main physico-chemical properties to address their differences. Finally, selected literature examples exhibiting the successive formation of π-mers and π-dimers within the same systems will be detailed to emphasize the physico-chemical changes occurring upon conversion.