Synthesis of a novel fluorescent and ion sensitive monomer bearing quinoxaline moieties and its electropolymerization

Synthesis and electropolymerization of a new ion sensitive ethylenedioxy-substituted terthiophene monomer bearing a quinoxaline moiety

“…The energy difference between these two levels is the band gap (Eg) and can be estimated from the onset of lower energy end of this band. The band gap (Eg) of P(EE-Q) was found to be 1.75 eV which is lower than its analogue P(TT-Q) and indicates that EDOT is a stronger donor group than thiophene [19,27]. Upon electrochemical oxidation, the P(EE-Q) film shows a simultaneous decrease in the absorbance at 530 nm, which is accompanied with a color change from brownish red to green.…”

“…There are also several reports on their use as metal chelators [17,18]. Recently, we have synthesized a series of new fluorescent monomers based on terthienyl systems bearing pendant quinoxaline moieties and found that 4-((2,5-dithiophen-2-yl)thiophen-3-yl)pyrrolo[1,2-a]quinoxaline (TT-Q) monomer and its polymer exhibit high sensitivity towards Fe 3+ ions [19]. Moreover, it was found that the polymer obtained on the basis of donor-acceptor approach exhibits reversible electrochromic response with high coloration efficiency.…”

Recent Examples in the Synthesis and Functionalization of C−H Bonds in Pyrrolo/Indolo [1,2‐a]Quinoxalines

“…C4‐alkenyl substituted pyrrolo[1,2‐ a ]quinoxalines such as III could be used as antileishmanial agents [1c] . Polymerization of the thiophene‐substituted pyrrolo[1,2‐ a ]quinoxaline IV afforded a promising sensor toward detection of Fe [3+] ion [1d] . Reduced forms of pyrrolo/indolo [1,2‐ a ]quinoxalines such as V (as Sirtuin 6 activator) and VI (as anti‐metastatic agent) were included in bio‐related studies [1e,f] .…”

First synthesis of meso-substituted pyrrolo[1,2-a]quinoxalinoporphyrins

“…On the other hand, compounds containing a pyrrolo[1,2- a ]quinoxaline subunit display a wide spectrum of biological profiles as antagonists [ 26 – 27 ], PARP-1 inhibitors [ 28 ], anticancer agents [ 29 – 30 ], anti-HIV agents [ 31 ], and antimalarial agents [ 32 – 33 ]. These molecules are also important intermediates for the construction of 5-HT 3 receptor agonists [ 34 – 35 ] and are useful as fluorescent materials for various applications [ 36 – 37 ].…”