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Structure and properties of iron–cyclam complex of 2-aminophenol

Vasconcellos, Luiz C.G ; Oliveira, Cristiane P ; Castellano, Eduardo E ; Ellena, Javier ; Moreira, Ícaro S

Polyhedron, 2001-03, Vol.20 (6), p.493-499 [Periódico revisado por pares]

Elsevier Ltd

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  • Título:
    Structure and properties of iron–cyclam complex of 2-aminophenol
  • Autor: Vasconcellos, Luiz C.G ; Oliveira, Cristiane P ; Castellano, Eduardo E ; Ellena, Javier ; Moreira, Ícaro S
  • Assuntos: 1,4,8,11-Tetraazacyclotetradecane ; 2-Aminophenol ; Iron–cyclam ; Macrocycle ; Quinone-related species ; X-ray structures
  • É parte de: Polyhedron, 2001-03, Vol.20 (6), p.493-499
  • Descrição: The cis-[Fe(cyclam)Cl 2]Cl and trans-[Fe(cyclam)Cl 2]BF 4 complexes were prepared by a new synthetic procedure. These isomers were characterized by elemental analysis, electronic spectroscopy ( λ max=238, 334 and λ max=238, 302 and 355 nm for cis- and trans-[Fe(cyclam)Cl 2] +, respectively) and electrochemistry ( E 1/2=212 and 83 mV; vs. Ag ∣ AgCl, KCl 3.5 M, 25°C μ=0.1 M NaTFA, pH 3.0 for cis- and trans-[Fe(cyclam)Cl 2] +, respectively). The reaction of cis-[Fe(cyclam)Cl 2] + isomer with 2-aminophenol (catH 3) ligand yields the cis-[Fe(cyclam)(qH)] 2+ complex, where (qH) is the quinonoid oxidized form of the (catH 3) ligand that is originated by an intramolecular electron transfer reaction. The cis-[Fe(cyclam)(qH)](PF 6) 2 complex crystallizes in the space group P2 1/ n, with two different values for Fe–N bond length, due to the σ and π distinct contributions. The electrochemical analysis of this species shows three one-electron sequential processes: E 1/2 (I)=−316 mV, E 1/2 (II)=+361 mV and E 1/2 (III)=+1.013 mV assigned to (sqH/catH 3), (qH/sqH) and (Fe(III)/Fe(II)) redox process, respectively.
  • Editor: Elsevier Ltd
  • Idioma: Inglês
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  • Realização: ABCD-USP USP   Logos de Redes Sociais: Freepik

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