Synthesis of Azo-Bridged Ferrocene Oligomers and a Polymer and Electrochemical and Optical Analysis of Internuclear Electronic Interactions in Their Mixed-Valence States.
Inorg Chem
; 38(22): 5113-5123, 1999 Nov 01.
Article
em En
| MEDLINE
| ID: mdl-11671258
ABSTRACT
New azo-bridged ferrocene trimers, Fc-Fc'-N=N-Fc (2) and Fc-N=N-Fc'-N=N-Fc (3), where Fc and Fc' refer to (eta(5)-C(5)H(5))Fe(eta(5)-C(5)H(4)-) and Fe(eta(5)-C(5)H(4)-)(2), respectively, were obtained in the reaction of a mixture of lithioferrocene and 1,1'-dilithioferrocene with N(2)O. X-ray crystallography of azoferrocene (1) has determined that the Fe-Fe distance is 6.80 Å in the trans form. Cyclic voltammograms of 3 in aprotic solvents such as CH(2)Cl(2) or THF exhibit reversible 2e(-) and 1e(-) oxidation waves, indicating that the positive charge in the monocation is localized mostly on the terminal ferrocene unit (correspondingly, Fc(+)-N(2)-Fc'-N(2)-Fc) due to a strong electron-withdrawing effect of the azo group. This charge distribution in the mixed-valence state is supported by the characteristics of intervalence-transfer (IT) bands. An asymmetrical complex, 2, undergoes a three-step 1e(-) oxidation, and the two mixed-valence forms can be roughly expressed as Fc(+)-Fc'-N(2)-Fc and Fc(+)-Fc'-N(2)-Fc(+). The redox potentials and IT band characteristics of 1(+), 2(+), and 2(2+) depend markedly on the solvent. The solvent effect of the IT band on nu(max) cannot be interpreted only by the parameters in the Marcus-Hush theory, indicating that the nature of the solvent as donor or acceptor should be taken into account in the electron-exchange process in the mixed-valence states. More donating solvent affords higher IT and LMCT energy, indicating the hole-transfer mechanism. The reaction of 1,1'-dilithioferrocene and N(2)O gives a polymer composed of [-(Fc'-N=N-Fc')(0.6)-(Fc'-Fc')(0.4)-](n)().
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Coleções:
01-internacional
Base de dados:
MEDLINE
Idioma:
En
Revista:
Inorg Chem
Ano de publicação:
1999
Tipo de documento:
Article
País de afiliação:
Japão