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H. Moura, M. M. Unterlass:
"Perylene Dyes@LTL-Type Zeolites: High-Performance Hybrid Materials for Optoelectronic Applications";
Poster: Gregori Aminoff Prize Symposium 2019, Royal Swedish Academy of Sciences, Sweden; 2019-04-01.

Perylene diimides (PDIs) are fluorescent dyes that have received considerable attention as organic materials due to their brilliant colors, outstanding photochemical stabilities, and high fluorescence quantum yields.1 However, high fluorescence quantum yields can only be obtained in dilute solution, i.e. when PDIs barely interact with each other. In the solid state however, PDIs´ fluorescence is quenched due to strong intermolecular π-π interactions. Clearly, as most optoelectronic applications use solid materials, the latter limits PDIs´ applicability.
An approach to circumvent this problem is to molecularly embed PDIs into an inorganic matrix, i.e. to generate hybrid materials (HMs). By this approach, one generates a solid material in which (in the best case, i.e. if finely dispersed) the PDIs barely interact with each other. Here, zeolites are an interesting class of matrix material. Among the natural and synthetic zeolites discovered up to date, LTL-type zeolites appear to be a suitable host material due to their unidimensional, cylindrical channels. Most of the techniques for the incorporation of PDIs into LTL-type zeolites are based on postsynthetic modifications of preformed zeolites, which usually leads to partial channel blocking and a poor control over the PDIs´ localization within the HM.2 To overcome the latter challenges, we have been developing a novel and green synthetic strategy that allows the simultaneous formation of LTL-type zeolites and PDIs.
Our approach is based on hydrothermal synthesis (HTS). HTS is the conventional synthetic pathway towards zeolites. We have recently shown that HTS can also be used for preparing a variety of fully organic compounds, including dyes.3,4 Here, we communicate our efforts to combine the synthesis of organic PDIs and inorganic LTLtype zeolites in one-step and one-pot using HTS. With this contribution we discuss both synthesis as well as the thorough characterization of the obtained PDI@LTL-type zeolite materials.

Website of the event: https://www.kva.se/en/kalendarium/gregori-aminoff-prissymposium-2019