Pentacyanoferrate(II) complexes: evaluation of their formal potentials and mechanism of their quenching of tris(2,2'-bipyridine)ruthenium(II) luminescence

Journal Article · Mon Feb 28 23:00:00 EST 1977 · Inorg. Chem.; (United States)

DOI:https://doi.org/10.1021/ic50169a008· OSTI ID:7318311

Toma, H E ^[1]; Creutz, C

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1. Univ., Sao Paulo, Brazil

Formal reduction potentials (E/sup 0/') for complexes of the pentacyanoferrate ion with a number of unsaturated ligands have been measured by cyclic voltammetry and potentiometry. From the association constants for the complexes in the iron(II) form (K/sub II/) and the E/sup 0/' values, the corresponding constants for the iron(III) complexes (K/sub III/) have been calculated. The K/sub III/ values are found to increase with the basicity of the ligand, while the opposite trend is found for the K/sub II/ values. These opposing trends are discussed in terms of the bonding properties of the pentacyanoferrate ion. The quenching of the luminescence of the excited state of tris(2,2'-bipyridine)ruthenium(II) by pentacyanoferrate(II) complexes has also been investigated. For most of the complexes, including several previously reported hexacyanometalates, the quenching rate constants parallel their reduction potentials as is expected for a quenching mechanism involving reduction of the ruthenium excited state by iron(II).

• OSTI ID: 7318311
• Journal Information: Inorg. Chem.; (United States), Journal Name: Inorg. Chem.; (United States) Vol. 16:3; ISSN INOCA
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
38 RADIATION CHEMISTRY, RADIOCHEMISTRY, AND NUCLEAR CHEMISTRY
400201 -- Chemical & Physicochemical Properties
400400* -- Electrochemistry
400600 -- Radiation Chemistry
CHEMICAL REACTION KINETICS
COMPLEXES
CYANIDES
IRON COMPLEXES
KINETICS
LUMINESCENCE
REACTION KINETICS
REDOX POTENTIAL
RUTHENIUM COMPLEXES
TRANSITION ELEMENT COMPLEXES