Department of Organic Chemistry, Institute of Cosmos Science, University of Barcelona (UB-IEEC) c. Martí i Franquès 1, 08028 Barcelona, Catalonia, Spain.
Chemistry. 2012 Jul 9;18(28):8820-6. doi: 10.1002/chem.201200881. Epub 2012 Jun 8.
The aggregation of achiral sulfonatophenyl- and phenyl-meso-substituted diprotonated porphyrins to chiral J-aggregates is a hierarchical noncovalent polymerization process preceded by a critical nucleation stage. This allows significant enantiomeric excesses by the formation of a few primary nuclei and the control of their growth by the effect that flows (imperfect mixing) have on the secondary nucleation of the J-aggregate particles. In addition, the results strongly suggest that when only one species of aggregate predominates, the CD signals of the three excitonic bands in the visible region (around 420, 490, and 700 nm) show the same sign. Thus, differences on their relative sign would be due to the presence of different species.
手性磺酸盐苯基和苯基中位取代二质子化卟啉聚集形成手性 J-聚集体是一个分级非共价聚合过程，该过程先于临界成核阶段。通过形成少数初级核并通过流动（不完全混合）对 J-聚集体颗粒的二次成核的影响来控制其生长，从而可以获得显著的对映过量。此外，结果强烈表明，当只有一种聚合体占优势时，可见光区（约 420、490 和 700nm 处）三个激子带的 CD 信号具有相同的符号。因此，它们相对符号的差异归因于不同物种的存在。
