Triarylpyrylium-based fluorescent DNA-binding dyes – facile synthesis, substituent effects, and sensing mechanism

Domahidy, Farkas László and Cseri, Levente and Gábor, Turczel and Blanka, Huszár and Rózsa J., Balázs and Mucsi, Zoltán and Kovács, Ervin (2025) Triarylpyrylium-based fluorescent DNA-binding dyes – facile synthesis, substituent effects, and sensing mechanism. RSC ADVANCES, 15 (36). pp. 29952-29959. ISSN 2046-2069

Preview	Text d5ra04750a.pdf - Published Version Available under License Creative Commons Attribution. Download (1MB) | Preview
Preview	Text RevisedManuscript_Triarylpyrylium-basedfluorescentDNA-bindingdyes.pdf - Accepted Version Download (1MB) | Preview

Abstract

Novel pyrylium-based fluorescent DNA-binding dyes were developed, containing p-aminoaryl groups at the a positions of the pyrylium moiety. The amines are substituted with aminoalkyl groups to enhance the dye's water solubility and DNA binding affinity. With this structural modification triarylpyryliums exhibit up to 7.6 times higher fluorescence enhancement upon binding to DNA, rendering them promising candidates for fluorogenic DNA sensors. The photochemical characteristics of the dyes, including the radiationless deexcitation pathways necessary for the DNA-induced fluorogenicity were studied using both spectroscopical experiments and theoretical calculations. Particular attention was given to the possibility of twisted intramolecular charge transfer (TICT) states as a quenching pathway in the unbound state. These findings support the rational design of structurally dynamic, environmentsensitive fluorophores for nucleic acid detection and molecular diagnostics.

Actions (login required)

Edit Item