title: Preparation, UV-vis, IR, EPR and resonance Raman study of Fe, Ni, Co and Zn dioxolene complexes.
abstract: An UV-vis, Raman, IR and EPR spectroscopic study was performed for the water soluble complexes of Fe(III), Ni(II), Co(II) and Zn(II) coordinated to dioxolene ligands derived from oxidized dopamine. The complexes were obtained and stabilized at neutral pH by the strong reducing agent sodium thiosulfate. Iron(III) stabilizes the ligand in catecholate form as [Fe(III)(Cat)2]1-, Cat=dopacatecholate, and the divalent metals as dopasemiquinone (SQ): [Ni(SQ)3]1-, [Co(SQ)3]1- and [Zn(SQ)3]1-. The resonance Raman spectra of the solid complexes as [CAT][Ni(SQ)3], [CTA][Co(SQ)3] and [CTA][Zn(SQ)3], CTA is the cetyltrimethylammonium, are very similar to the spectra of the complexes in solution, while the Fe(III) complex is a mixture of two iron complexes, with catecholate or dopasemiquinone ligands.
authors.affiliation: Laboratory of Environmental Physical Chemistry, Department of Chemistry, CCE, Londrina State University, Londrina, PR, Brazil. barreto@uel.br
authors.forename: Wagner J
authors.initials: WJ
authors.lastname: Barreto
authors.forename: Romulo A
authors.initials: RA
authors.lastname: Ando
authors.forename: Paulo S
authors.initials: PS
authors.lastname: Santos
authors.forename: Waleria P
authors.initials: WP
authors.lastname: Silva
mesh_terms: D003035:Cobalt / Q000737:chemistry; D004298:Dopamine / Q000737:chemistry; D004578:Electron Spin Resonance Spectroscopy; D007501:Iron / Q000737:chemistry; D019216:Metals, Heavy / Q000737:chemistry*; D009532:Nickel / Q000737:chemistry; D009942:Organometallic Compounds / Q000138:chemical synthesis* / Q000737:chemistry*; D010084:Oxidation-Reduction; D012996:Solutions; D013055:Spectrophotometry, Infrared; D013056:Spectrophotometry, Ultraviolet; D013059:Spectrum Analysis, Raman; D015032:Zinc / Q000737:chemistry
chemical_list: D019216:Metals, Heavy; D009942:Organometallic Compounds; D012996:Solutions; D003035:Cobalt; D009532:Nickel; D007501:Iron; D015032:Zinc; D004298:Dopamine