Spectroscopic and electrochemical properties of iron(II) complexes of polydentate Schiff bases containing pyrazine, pyridine and imidazole groups - Souza, Vagner Roberto de; Rechenberg, Hercilio Rodolfo; Bonacin, Juliano Alves; Toma, Henrique Eisi (Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy, 2008)