Naslov
Spectroscopic and computational studies of protonation equlibria displayed by fluorescent pentacyclic benzimidazole derivatives

Autori
Perin, Nataša ; Hranjec, Marijana ; Vianello, Robert ; Babić, Darko

Vrsta, podvrsta i kategorija rada
Sažeci sa skupova, sažetak, znanstveni

Izvornik
Central European Conference on Photochemistry (CECP 2018): Book of Abstracts / - , 2018, 90-90

Skup
Central European Conference on Photochemistry (CECP 2018)

Mjesto i datum
Bad Hofgastein, Austrija, 04.02.2018. - 08.02.2018

Vrsta sudjelovanja
Poster

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
benzimidazole derivatives ; spectroscopic and computational studies ; pH sensors

Sažetak
Amino substituted benzo[b]thieno[2, 3-b]pyrido[1, 2-a]benzimidazoles are presented as potential fluorescent pH sensitive probes. The general structure of these dye molecules is based on a fused and highly conjugated planar chromophore system [1]. Because of this they show excellent optical properties, including strong fluorescence in the visible spectrum (around 500 nm) as well as good photostability. In order to determine the possibility of compounds 1, 2 and 3 for analytical applications as pH sensors, the changes in their spectroscopic properties depending on the pH value were studied by UV/Vis and fluorescence spectroscopy. It has been found that the protonation-deprotonation equilibria of the dyes is associated with drastic changes in photophysical properties. For example, as shown in Fig. 2, strong increase of the fluorescence intensity of 3 occure on exposure to acidic solutions [2]. Computational analysis revealed the changes in the protonation state occurs in the range 3 < pH < 5 in accordance with experiments.

Izvorni jezik
Engleski

Znanstvena područja
Kemija

POVEZANOST RADA