title: Cu(II)-mediated synthesis of a new fluorescent pyrido[1,2-a]quinoxalin-11-ium derivative.
abstract: Quinoxalines are heterocyclic compounds with potential application as drugs or fluorophores. However, few quinoxalinylium salts have been reported in the literature. This manuscript describes the synthesis and structural characterization of a previously unknown quinoxalinylium derivative, 2-aminopyrido[1,2-a]quinoxalin-11-ylium ([1](+)), as perchlorate and thiocyanate salts from the Cu(II)-mediated reaction of a Schiff base. The reaction is most efficient with Cu(II). The formation of a small quantity was observed spectroscopically in the presence of either a strong oxidizer or Mn (II). No product formation was observed with Zn(II), Cd(II), Fe(II), or Ni(II). [1](+) emits at 580 nm, with a quantum yield estimated as 0.23, upon excitation at 470 nm.
authors.affiliation: Department of Chemistry, Indian Institute of Technology Guwahati, North Guwahati 781039, Assam, India.
authors.forename: Rik Rani
authors.initials: RR
authors.lastname: Koner
authors.forename: Manabendra
authors.initials: M
authors.lastname: Ray
mesh_terms: D003300:Copper / Q000737:chemistry*; D005456:Fluorescent Dyes / Q000138:chemical synthesis* / Q000737:chemistry; D011726:Pyridinium Compounds / Q000138:chemical synthesis* / Q000737:chemistry; D011810:Quinoxalines / Q000138:chemical synthesis* / Q000737:chemistry; D013057:Spectrum Analysis
chemical_list: C533448:2-aminopyrido(1,2-a)quinoxalin-11-ylium; D005456:Fluorescent Dyes; D011726:Pyridinium Compounds; D011810:Quinoxalines; D003300:Copper