Synthesis and Optical Properties of Quinoxalines Functionalized as Proton and Metal Ion Capturing Chemosensors

Abstract

Heterocyclic fluorophores are useful materials in new biologically active compounds and diagnostic methods. The chemistry of nitrogen-containing heterocyclic molecules has attracted attention for many years. The fluorescent optical changes of fluorephore are very important to the application of colorants as chemosensors. The absorption and emission wavelength of quinoxaline can easily be changed through the protonation of the nitrogen inside the quinoxaline ring. Several 2,3-distyrylquinoxaline compounds containing different substituents and metal-chelating aza-crown ether substituent were synthesized, and the optical properties of these compounds were investigated in order to determine their electron-donating effect, solvatochromic effect, and metal chelating effect of the substituents.