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Generally speaking, planar metalloporphyrins with electron-donating meso-aryl groups give O2u-type -T-cation radicals having substantial spin density on meso-carbons; see: Atamian, M.; Wagner, R. W.; Lindsey, J. L.; Bocian, D. F. Inorg. Chem. 1988, 27, 1510.
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33744850115
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Procedures for the preparation of all compounds as well as spectral data are contained in the Supporting Information.
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Procedures for the preparation of all compounds as well as spectral data are contained in the Supporting Information.
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43
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0029902288
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MO calculations and electrochemistry are consistent with an Q2ll-like HOMO for meso-ethynyl porphyrins; see: LeCours, S. M.; DiMagno, S. G.; Therien, M. J. J. Am. Chem. Soc. 1996, 778, 11854.
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33744878428
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note
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Porphyrin oxidation was achieved by cannulating 2 equiv of tris(4-bromophenyDamminium hexachloroantimonate into a cold (-78 °C) méthylène chloride solution of bis(porphyrin). After 30 min, solvent was removed on the Schlenk line, and the green solid was taken into a glovebox for EPR sample preparation. Samples were 10 mil in bis(porphyrin) for frozensolution experiments and 1 mM for fluid-solution EPR measurements. The EPR spectra of solutions of oxidized 2 remain unchanged for several days.
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49
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85085634113
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2+ consists of a single line devoid of hyperfme structure; see the Supporting Information.
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2+ consists of a single line devoid of hyperfme structure; see the Supporting Information.
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51
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33744859868
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note
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ms,2 is the field at which the Am, = 2 transition occurs, and D is the zero-field-splitting parameter.
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53
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33847798299
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An empirical correction to the point-dipole expression has been suggested for dinitroxide biradicals; see: Gleason, W. B.; Barnett, R. E. J. Am. Chem. Soc. 1976, 9S, 2701.
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0000785837
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Berson, J. A., Ed.; John Wiley & Sons: New York
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For a discussion of the utility of Curie plots, see the following and references therein: The Chemistry ofQuinonoid Compounds; Berson, J. A., Ed.; John Wiley & Sons: New York, 1988; Vol. 2, pp 473-489.
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