Work

Fluorescence of 2-Hydroxy Chalcone Analogs with Extended Conjugation: ESIPT vs. ICT Pathways

Year: 2024

Type: article

Abstract: The chalcone derivatives with hydroxy group (2) have been examined using low-temperature fluorescence spectroscopy. The study aimed to freeze the intramolecular charge transfer (ICT) motion in order to reveal the potential hidden transition(s) that are difficult to observe at room temperature. Although chalcone 2 revealed one emission peak at ~667 nm at room temperature, it exhibited two emission peaks (λem = 580 and 636 nm) in EtOH at liquid N2 temperatures (77 K). With the aid of model compound 3 with methoxy group and aluminum complex 2-Al3+, attempts were made to assign these emission peaks. The results point towards the possibility of the coexistence of ICT and excited state intramolecular proton transfer (ESIPT) in the chalcone derivatives with extended conjugation.

Source: Molecules

DOI: 10.3390/molecules29245972

Authors: Brian Corbin, Paityn Houglan, Yi Pang

Institution: University of Akron

Language: English

Topic: Photochemistry and Electron Transfer Studies

Subfield: Physical and Theoretical Chemistry

Field: Chemistry

Domain: Physical Sciences

Open Access status: gold

Estimated APC paid: $3,069

Funder: National Institutes of Health