Optical study of the formation of pyrrolo[2,3-d]pyrimidine-based fluorescent nanoaggregates |
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Authors: | Lina Skardžiūtė,Karolis Kazlauskas,Jelena Dodonova,Jonas Bucevičius,Sigitas Tumkevičius,Saulius Jur&scaron ėnas |
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Affiliation: | 1. Institute of Applied Research, Vilnius University, Saul?tekio 9-III, LT-10222 Vilnius, Lithuania;2. Department of Organic Chemistry, Vilnius University, Naugarduko 24, LT-03225 Vilnius, Lithuania |
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Abstract: | Pyrrolo[2,3-d]pyrimidine derivatives possessing different sterically-hindered end-groups at position 7 of the heterocycle were studied and compared with respect to nanoaggregate formation ability by the reprecipitation method in aqueous solutions. The emergence of nanoaggregates with an increasing water fraction in THF/water mixture was traced by observing sudden changes in spectral and transient fluorescence dynamics accompanied by fluorescence efficiency turn-on. The aggregation induced emission with a maximal 20-fold emission efficiency enhancement was obtained. Tuning of the nanoaggregates sizes from about 50 nm to 600 nm by increasing the THF/water ratio was revealed by electron microscopy. Almost perfect spherical shapes of the nanoaggregates and their structureless fluorescence bands similar to those of their neat amorphous films suggested an amorphous-like nature of the pyrrolo[2,3-d]pyrimidine-based nanoparticles. |
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Keywords: | Pyrrolo[2,3-d]pyrimidines Fluorescent organic nanoparticles Fluorescence turn-on Oligoarylenes |
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