Universität Würzburg, Institut für Organische Chemie, Am Hubland, 97074, Würzburg, Germany.
Universität Würzburg, Center for Nanosystems Chemistry (CNC) and Bavarian Polymer Institute (BPI), Theodor-Boveri-Weg, 97074, Würzburg, Germany.
Angew Chem Int Ed Engl. 2017 Dec 11;56(50):16008-16012. doi: 10.1002/anie.201709307. Epub 2017 Nov 15.
The self-assembly of a new perylene bisimide (PBI) organogelator with 1,7-dimethoxy substituents in the bay position affords non-fluorescent H-aggregates at high cooling rates and fluorescent J-aggregates at low cooling rates. Under properly adjusted conditions, the kinetically trapped "off-pathway" H-aggregates are transformed into the thermodynamically favored J-aggregates, a process that can be accelerated by the addition of J-aggregate seeds. Spectroscopic studies revealed a subtle interplay of π-π interactions and intra- and intermolecular hydrogen bonding for monomeric, H-, and J-aggregated PBIs. Multiple polymerization cycles initiated from the seed termini demonstrate the living character of this chain-growth supramolecular polymerization process.
具有 1,7-二甲氧基取代基的新型苝二酰亚胺 (PBI) 自组装体在高冷却速率下提供非荧光 H-聚集体，在低冷却速率下提供荧光 J-聚集体。在适当调整的条件下，动力学捕获的“偏离路径”H-聚集体转化为热力学有利的 J-聚集体，这一过程可以通过添加 J-聚集体种子来加速。光谱研究揭示了单体、H-和 J-聚集 PBI 中 π-π 相互作用以及分子内和分子间氢键的微妙相互作用。从种子末端引发的多个聚合循环证明了这种链增长超分子聚合过程的活性特征。
