Ionic liquid-controlled J- versus H-aggregation of cyanine dyes

摘要

Cyanine dyes are triggered to form fluorescent H-aggregates in IL [C_nmim][BF4], whereas J-aggregates are observed to form in ILs with other anions as 2 wt% 1 M aqueous NaOH is added at room temperature; difference in hydrolytic properties of [BF_4]~-ILs over other ILs is hypothesized to be the reason.