Spectroscopy and Electrochemistry of Cobalt(III) Schiff Base Complexes

Inorganic Chemistry

Volumn 36, Issue 12, 1997, Pages 2498-2504

  Böttcher, Arnd ^a   Takeuchi, Toshihiko ^a   Hardcastle, Kenneth I ^a,c   Meade, Thomas J ^a   Gray, Harry B ^a   Cwikel, Dory ^b   Kapon, Moshe ^b   Dori, Zvi ^b  

^a CALIFORNIA INSTITUTE OF TECHNOLOGY   (United States)

^b TECHNION ISRAEL INSTITUTE OF TECHNOLOGY   (Israel)

^c CALIFORNIA STATE UNIVERSITY   (United States)

Author keywords

[No Author keywords available]

Indexed keywords

EID: 0343370029     PISSN: 00201669     EISSN: None     Source Type: Journal    
DOI: 10.1021/ic961146v     Document Type: Article

References (40)

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3. Bloemink, M. J.; Reedijk, J. In Metal Ions in Biological Systems; Sigel, A., Sigel, H., Eds.; Marcel Dekker, Inc.: New York, 1996; p 641. Whitehead, J. P., Lippard, S. J. Ibid., p 687.
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8. III(acacen) absorption spectra: (a) Marcu, G.; Várhelyi, C.; Fülöp, J.; Itul, D. Rev. Roum. Chim. 1989, 34, 1029. (b) Abdel Salam El Absy, M.; Marcu, G.; Zsakó, J.; Várhelyi, C. Rev. Roum. Chim. 1982, 27, 917. (c) Costa, G.; Mestroni, G.; Tauzher, G.; Stefani, L. J. Organomet. Chem. 1966, 6, 181.
9. III(acacen) absorption spectra: (a) Marcu, G.; Várhelyi, C.; Fülöp, J.; Itul, D. Rev. Roum. Chim. 1989, 34, 1029. (b) Abdel Salam El Absy, M.; Marcu, G.; Zsakó, J.; Várhelyi, C. Rev. Roum. Chim. 1982, 27, 917. (c) Costa, G.; Mestroni, G.; Tauzher, G.; Stefani, L. J. Organomet. Chem. 1966, 6, 181.
10. III(acacen) electrochemistry: (a) Averill, D. F.; Broman, R. F. Inorg. Chem. 1978, 77, 3389. (b) Costes, J. P.; Cros, G.; Muratet, F.; Darbieu, M.-H. Polyhedron 1987, 6, 995. (c) Costes, J. P.; Cros, G.; Darbieu, M.-H.; Laurent, J.-P. Trans. Met. Chem. 1982, 7, 219. (d) Darbieu, M.-H.; Cros, G.; de Montauzon, D.; Laurent, J.-P. Trans. Met. Chem. 1982, 7, 149.
11. III(acacen) electrochemistry: (a) Averill, D. F.; Broman, R. F. Inorg. Chem. 1978, 77, 3389. (b) Costes, J. P.; Cros, G.; Muratet, F.; Darbieu, M.-H. Polyhedron 1987, 6, 995. (c) Costes, J. P.; Cros, G.; Darbieu, M.-H.; Laurent, J.-P. Trans. Met. Chem. 1982, 7, 219. (d) Darbieu, M.-H.; Cros, G.; de Montauzon, D.; Laurent, J.-P. Trans. Met. Chem. 1982, 7, 149.
12. III(acacen) electrochemistry: (a) Averill, D. F.; Broman, R. F. Inorg. Chem. 1978, 77, 3389. (b) Costes, J. P.; Cros, G.; Muratet, F.; Darbieu, M.-H. Polyhedron 1987, 6, 995. (c) Costes, J. P.; Cros, G.; Darbieu, M.-H.; Laurent, J.-P. Trans. Met. Chem. 1982, 7, 219. (d) Darbieu, M.-H.; Cros, G.; de Montauzon, D.; Laurent, J.-P. Trans. Met. Chem. 1982, 7, 149.
13. III(acacen) electrochemistry: (a) Averill, D. F.; Broman, R. F. Inorg. Chem. 1978, 77, 3389. (b) Costes, J. P.; Cros, G.; Muratet, F.; Darbieu, M.-H. Polyhedron 1987, 6, 995. (c) Costes, J. P.; Cros, G.; Darbieu, M.-H.; Laurent, J.-P. Trans. Met. Chem. 1982, 7, 219. (d) Darbieu, M.-H.; Cros, G.; de Montauzon, D.; Laurent, J.-P. Trans. Met. Chem. 1982, 7, 149. (e) Costa, G.; Mestroni, G.; Puxeddu, A.; Reisenhofer, E. J. Chem. Soc. A 1970, 2870.
14. III(acacen) electrochemistry: (a) Averill, D. F.; Broman, R. F. Inorg. Chem. 1978, 77, 3389. (b) Costes, J. P.; Cros, G.; Muratet, F.; Darbieu, M.-H. Polyhedron 1987, 6, 995. (c) Costes, J. P.; Cros, G.; Darbieu, M.-H.; Laurent, J.-P. Trans. Met. Chem. 1982, 7, 219. (d) Darbieu, M.-H.; Cros, G.; de Montauzon, D.; Laurent, J.-P. Trans. Met. Chem. 1982, 7, 149. (e) Costa, G.; Mestroni, G.; Puxeddu, A.; Reisenhofer, E. J. Chem. Soc. A 1970, 2870.
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27. 5ccounteranion
28. This band is shifted to shorter wavelengths by 5-12 nm in aqueous solution. Substitution of the counteranion of the complex (chloride, bromide, tetraphenylborate) does not significantly influence the spectrum.
29. Bosnich, B. J. Am. Chem. Soc. 1968, 90, 627.
30. a) Ridley, J. E.; Zerner, M. C. Theor. Chim. Acta 1973, 32, 111.
31. (b) Bacon, A.; Zerner, M. C. Theor. Chim. Acta 1979, 53, 21.
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34. -1 (oscillator strength, A)]: Free ligand (L), A = Me, B = H, 40 049 (0.9366); Zn(L), A = Me, B = H, 36 314 (0.8972); Zn(L), A = Ph, B = H, 35083 (1.197).
35. -1.25 i.e., if the axial ligand is not present in excess, the corresponding four-coordinate Co(II) complex will be the dominant species in solution. Indeed, the reversible Co(II/I) couple does not depend on the concentration of the potential axial ligands, which confirms that the Co(III) complex loses both axial ligands upon electrochemical reduction to Co(III) in acetonitrile solution under the experimental conditions.
36. Carter, M. J.; Rillema, D. P.; Basolo, F. J. Am. Chem. Soc. 1974, 96, 392.
37. The anodic-cathodic peak potential separation for the Co(II/I) couple is 75-95 mV (scan rate 0.1 V/s) and thus larger than expected theoretically for a reversible one-electron process: Bard, A. J.; Faulkner, L. R. Electrochemical Methods, Fundamentals and Applications; Wiley: New York, 1980. However, under the conditions of our experiment the peak separation of the ferrocene/ferrocenium couple was observed to be 80-100 mV, which can be used as a criterion for electrochemical reversibility. The peak separation increases only slightly with increasing scan rate, and the same is true for the ferrocenel ferrocenium couple under our experimental conditions.
38. II(acacen) complexes form only mono (pyridine) adducts requires revision.
39. 3, 10.25. Perrin, D. D. Dissociation Constants of Organic Bases in Aqueous Solution; Butterworths: London, 1972; Suppl, 1972.
40. Tait, A. M.; Lovecchio, F. V.; Busch, D. H. Inorg. Chem. 1977, 16, 2206.