Effect of asymmetry on the electronic delocalization in diiron and iron-cobalt mixed valence metallocenic compounds |
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Authors: | Portilla Y Chávez I Arancibia V Loeb B Manríquez J M Roig A Molins E |
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Institution: | Institut de Ciència de Materials de Barcelona (ICMAB-CSIC), Campus UAB, 08193 Bellaterra, Barcelona, Espa?a. |
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Abstract: | In this work, we report the synthesis and a study on the degree of electronic delocalization in the asymmetric mixed valence complexes CpFe(C(8)H(6))Fe(C(8)H(7))](+), 3a(+), and CpCo(C(8)H(6))Fe(C(8)H(7))](+), 3b(+), (Cp = C(5)Me(5), C(8)H(6) = pentalenyde, C(8)H(7) = hydropentalenyde, and = ((3,5(CF(3))(2)C(6)H(3))(4)B(-))). Electrochemical methods, (57)Fe M?ssbauer spectroscopy, electronic spectroscopy, and electron paramagnetic resonance were used for this purpose. Although the anti conformation of the complexes precludes any metal-metal interaction, all the techniques employed show that 3a(+) is a electronic delocalized system, while 3b(+) behaves as two individual metallic centers with localized electron density. |
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