Three redox states of nitrosyl: NO+, NO*, and NO-/HNO interconvert reversibly on the same pentacyanoferrate(II) platform.
Not so elusive: [Fe(II)(CN)(5)(HNO)](3-) has been characterized spectroscopically after the two-electron reduction of nitroprusside (see scheme). The complex is stable at pH 6, slowly decomposing to [Fe(CN)(6)](4-) and N(2)O. It is deprotonated at increasing pH value with oxidation of bound NO(-) to [Fe(II)(CN)(5)(NO)](3-). [Fe(II)(CN)(5)(HNO)](3-) is the first non-heme iron-nitroxyl complex prepared in aqueous solution that is reversibly redox-active under biologically relevant conditions.
Montenegro
Andrea C
AC
Departamento de Química Inorgánica, Analítica y Química Física, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires and INQUIMAE, CONICET, Intendente Güiraldes 2160, Ciudad Universitaria, Pabellón 2, Buenos Aires, C1428EHA, Argentina.
Amorebieta
Valentín T
VT
Slep
Leonardo D
LD
Martín
Diego F
DF
Roncaroli
Federico
F
Murgida
Daniel H
DH
Bari
Sara E
SE
Olabe
José A
JA
D005296:Ferrous Compounds / Q000737:chemistry*; D009682:Magnetic Resonance Spectroscopy; D009569:Nitric Oxide / Q000737:chemistry*; D009599:Nitroprusside / Q000737:chemistry*; D010084:Oxidation-Reduction; D017550:Spectroscopy, Fourier Transform Infrared
D005296:Ferrous Compounds; C058614:pentacyanoferrate (II); D009599:Nitroprusside; D009569:Nitric Oxide