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Darmon JM, Stieber SCE, Sylvester KT, Fernández I, Lobkovsky E, Semproni SP, Bill E, Wieghardt K, DeBeer S, Chirik PJ. Oxidative addition of carbon-carbon bonds with a redox-active bis(imino)pyridine iron complex. J Am Chem Soc 2012; 134:17125-37. [PMID: 23043331 PMCID: PMC3777725 DOI: 10.1021/ja306526d] [Citation(s) in RCA: 125] [Impact Index Per Article: 10.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Abstract
Addition of biphenylene to the bis(imino)pyridine iron dinitrogen complexes, ((iPr)PDI)Fe(N(2))(2) and [((Me)PDI)Fe(N(2))](2)(μ(2)-N(2)) ((R)PDI = 2,6-(2,6-R(2)-C(6)H(3)-N═CMe)(2)C(5)H(3)N; R = Me, (i)Pr), resulted in oxidative addition of a C-C bond at ambient temperature to yield the corresponding iron biphenyl compounds, ((R)PDI)Fe(biphenyl). The molecular structures of the resulting bis(imino)pyridine iron metallacycles were established by X-ray diffraction and revealed idealized square pyramidal geometries. The electronic structures of the compounds were studied by Mössbauer spectroscopy, NMR spectroscopy, magnetochemistry, and X-ray absorption and X-ray emission spectroscopies. The experimental data, in combination with broken-symmetry density functional theory calculations, established spin crossover (low to intermediate spin) ferric compounds antiferromagnetically coupled to bis(imino)pyridine radical anions. Thus, the overall oxidation reaction involves cooperative electron loss from both the iron center and the redox-active bis(imino)pyridine ligand.
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Affiliation(s)
- Jonathan M. Darmon
- Department of Chemistry and Chemical Biology, Baker Laboratory, Cornell University, Ithaca, New York 14850, United States
- Department of Chemistry, Princeton University, Princeton, New Jersey 08544, United States
| | - S. Chantal E. Stieber
- Department of Chemistry, Princeton University, Princeton, New Jersey 08544, United States
| | - Kevin T. Sylvester
- Department of Chemistry and Chemical Biology, Baker Laboratory, Cornell University, Ithaca, New York 14850, United States
| | - Ignacio Fernández
- Área de Química Orgánica, Universidad de Almería, Carretera de Sacramento s/n, 04120, Almería, Spain
| | - Emil Lobkovsky
- Department of Chemistry and Chemical Biology, Baker Laboratory, Cornell University, Ithaca, New York 14850, United States
| | - Scott P. Semproni
- Department of Chemistry, Princeton University, Princeton, New Jersey 08544, United States
| | - Eckhard Bill
- Max-Planck Institute for Chemical Energy Conversion, Stiftstrasse 34-36, D-45470 Mülheim an der Ruhr, Germany
| | - Karl Wieghardt
- Max-Planck Institute for Chemical Energy Conversion, Stiftstrasse 34-36, D-45470 Mülheim an der Ruhr, Germany
| | - Serena DeBeer
- Department of Chemistry and Chemical Biology, Baker Laboratory, Cornell University, Ithaca, New York 14850, United States
- Max-Planck Institute for Chemical Energy Conversion, Stiftstrasse 34-36, D-45470 Mülheim an der Ruhr, Germany
| | - Paul J. Chirik
- Department of Chemistry, Princeton University, Princeton, New Jersey 08544, United States
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Paulsen H, Duelund L, Winkler H, Toftlund H, Trautwein AX. Free energy of spin-crossover complexes calculated with density functional methods. Inorg Chem 2001; 40:2201-3. [PMID: 11304167 DOI: 10.1021/ic000954q] [Citation(s) in RCA: 215] [Impact Index Per Article: 9.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- H Paulsen
- Institut für Physik, Medizinische Universität Lübeck, D-23538 Lübeck, Germany
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Boča R, Vrbová M, Werner R, Haase W. Spin crossover in iron(II) tris(2-(2-pyridyl)benzimidazole) complex monitored by the variable temperature EXAFS. Chem Phys Lett 2000. [DOI: 10.1016/s0009-2614(00)00902-7] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Gütlich P, Hauser A, Spiering H. Thermisch und optisch schaltbare Eisen(II)-Komplexe. Angew Chem Int Ed Engl 1994. [DOI: 10.1002/ange.19941062006] [Citation(s) in RCA: 396] [Impact Index Per Article: 13.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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