Syntheses, Crystal Structures, Spectroscopic Properties, and Catalytic Aerobic Oxidations of Novel Trinuclear Non-Heme Iron Complexes
Rabe V, Frey W, Baro A, Laschat S, Bauer M, Bertagnolli H, Rajagopalan S, Asthalter T, Roduner E, Dilger H, Glaser T, et al. (2009)
EUROPEAN JOURNAL OF INORGANIC CHEMISTRY 2009(31): 4660-4674.
Zeitschriftenaufsatz
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Autor*in
Rabe, Volker;
Frey, Wolfgang;
Baro, Angelika;
Laschat, Sabine;
Bauer, Matthias;
Bertagnolli, Helmut;
Rajagopalan, Subramanian;
Asthalter, Tanja;
Roduner, Emil;
Dilger, Herbert;
Glaser, ThorstenUniBi;
Schnieders, David
Alle
Alle
Einrichtung
Abstract / Bemerkung
A series of 2,6-diacylpyridine ligand precursors 5a-d center dot HCl with different tether lengths between the carboxyl and pyridine moiety was prepared and converted into the correspondig trinuclear Fe-3(mu(3)-O) complexes 8a-d and 10. Under slow precipitation conditions a tetranuclear complex 9 was isolated instead of 8a. Single-crystal X-ray diffraction analyses were performed on ligands 5a-d and complexes 9 and 10. Characterization by X-ray absorption spectroscopy (XAS) proved a trinuclear Fe-3(mu(3)-O) core for complexes 8a-d. When complex 8a was submitted to Gif-type oxidations (O-2, Zn, pyridine, HOAc), Mossbauer and nuclear inelastic scattering (NIS) suggested the formation of mononuclear species. The trinuclear ferric complex 10 has an isosceles molecular structure, which is manifested in the Fe-57 Mossbauer spectrum by two quadrupole doublets with a 2:1 intensity ratio. The magnetic measurements reveal two moderate antiferromagnetic exchange interactions of -22.1 and -33.8 cm(-1). Spin concentrations of complex 10 were determined by EPR spectroscopy, which supports the Mossbauer and magnetic studies. Complexes 8-10 were employed in catalytic aerobic oxidations of adamantane 11, cyclohexene 19, and alpha-pinene 23. For adamantane 11, the oxidation of secondary C-H bonds to the corresponding ketone 14 is favored. In addition, adamantylpyridines 15-18 were isolated, thus supporting a radical pathway. A strong preference of allylic oxidation versus epoxidation was found for cyclohexene 19 and alpha-pinene 23. ((C) Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2009)
Stichworte
Carboxylate ligands;
EXAFS spectroscopy;
Mossbauer;
Oxidation;
EPR spectroscopy;
spectroscopy
Erscheinungsjahr
2009
Zeitschriftentitel
EUROPEAN JOURNAL OF INORGANIC CHEMISTRY
Band
2009
Ausgabe
31
Seite(n)
4660-4674
ISSN
1434-1948
eISSN
1099-0682
Page URI
https://pub.uni-bielefeld.de/record/1589580
Zitieren
Rabe V, Frey W, Baro A, et al. Syntheses, Crystal Structures, Spectroscopic Properties, and Catalytic Aerobic Oxidations of Novel Trinuclear Non-Heme Iron Complexes. EUROPEAN JOURNAL OF INORGANIC CHEMISTRY. 2009;2009(31):4660-4674.
Rabe, V., Frey, W., Baro, A., Laschat, S., Bauer, M., Bertagnolli, H., Rajagopalan, S., et al. (2009). Syntheses, Crystal Structures, Spectroscopic Properties, and Catalytic Aerobic Oxidations of Novel Trinuclear Non-Heme Iron Complexes. EUROPEAN JOURNAL OF INORGANIC CHEMISTRY, 2009(31), 4660-4674. https://doi.org/10.1002/ejic.200900516
Rabe, Volker, Frey, Wolfgang, Baro, Angelika, Laschat, Sabine, Bauer, Matthias, Bertagnolli, Helmut, Rajagopalan, Subramanian, et al. 2009. “Syntheses, Crystal Structures, Spectroscopic Properties, and Catalytic Aerobic Oxidations of Novel Trinuclear Non-Heme Iron Complexes”. EUROPEAN JOURNAL OF INORGANIC CHEMISTRY 2009 (31): 4660-4674.
Rabe, V., Frey, W., Baro, A., Laschat, S., Bauer, M., Bertagnolli, H., Rajagopalan, S., Asthalter, T., Roduner, E., Dilger, H., et al. (2009). Syntheses, Crystal Structures, Spectroscopic Properties, and Catalytic Aerobic Oxidations of Novel Trinuclear Non-Heme Iron Complexes. EUROPEAN JOURNAL OF INORGANIC CHEMISTRY 2009, 4660-4674.
Rabe, V., et al., 2009. Syntheses, Crystal Structures, Spectroscopic Properties, and Catalytic Aerobic Oxidations of Novel Trinuclear Non-Heme Iron Complexes. EUROPEAN JOURNAL OF INORGANIC CHEMISTRY, 2009(31), p 4660-4674.
V. Rabe, et al., “Syntheses, Crystal Structures, Spectroscopic Properties, and Catalytic Aerobic Oxidations of Novel Trinuclear Non-Heme Iron Complexes”, EUROPEAN JOURNAL OF INORGANIC CHEMISTRY, vol. 2009, 2009, pp. 4660-4674.
Rabe, V., Frey, W., Baro, A., Laschat, S., Bauer, M., Bertagnolli, H., Rajagopalan, S., Asthalter, T., Roduner, E., Dilger, H., Glaser, T., Schnieders, D.: Syntheses, Crystal Structures, Spectroscopic Properties, and Catalytic Aerobic Oxidations of Novel Trinuclear Non-Heme Iron Complexes. EUROPEAN JOURNAL OF INORGANIC CHEMISTRY. 2009, 4660-4674 (2009).
Rabe, Volker, Frey, Wolfgang, Baro, Angelika, Laschat, Sabine, Bauer, Matthias, Bertagnolli, Helmut, Rajagopalan, Subramanian, Asthalter, Tanja, Roduner, Emil, Dilger, Herbert, Glaser, Thorsten, and Schnieders, David. “Syntheses, Crystal Structures, Spectroscopic Properties, and Catalytic Aerobic Oxidations of Novel Trinuclear Non-Heme Iron Complexes”. EUROPEAN JOURNAL OF INORGANIC CHEMISTRY 2009.31 (2009): 4660-4674.
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