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Abbreviations used: TPP, 5,10,15,20-tetraphenylporphyrin; OEP, 2,3,7,8,12,13,17,18-octaethylporphyrin; DPP, 2,3,5,7,8,10,12,13,15,17,18,20-dodecaphenylporphyrin; PPDME, 2,18-dimethylpropionate-3,18-divinyl-3,7,12,17-tetramethylporphyrin; T(tert-butyl)P, 5,10,15,20-tetra-tert-butylporphyrin; OETPP, 5,10,15,20-tetraphenyl-2,3,7,8,12,13,17,18-octaethylporphyrin.
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1(π,π*) spectrum of NiDPP occurs about 5 nm to shorter wavelengths than the position of the ground-state Soret band (Figures 3 and 4A), and (iii) the amplitude of the bleaching is about 40% of that expected based on the amplitudes of the bleachings in the Q bands.
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manuscript in preparation
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Drain, C. M.; Nurco, D. J.; Medforth, C. J.; Smith, K. M.; Holten, D., manuscript in preparation.
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Drain, C.M.1
Nurco, D.J.2
Medforth, C.J.3
Smith, K.M.4
Holten, D.5
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71
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85033043441
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note
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1(π,π*) decay.
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72
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85033072539
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note
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Since similar spectra of the ligand-field excited state have been observed for NiTPP, NiOEP, NiPPDME, and all the other nickel porphyrins investigated previously, specific effects involving the peripheral groups appear to be relatively unimportant. Since similar results have been found for all of these molecules using several different excitation wavelengths, it is unlikely that the red-shifts derive from excitation of some fraction of slightly distorted molecules that may be present in solution.
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73
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85033053008
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manuscript in preparation
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Drain, C. M.; Nurco, D. J.; Ema, T.; Nelson, N. Y.; Medforth, C. J.; Smith, K. M.; Simpson, C.; Shelnutt, J. A.; Holten, D., manuscript in preparation.
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Drain, C.M.1
Nurco, D.J.2
Ema, T.3
Nelson, N.Y.4
Medforth, C.J.5
Smith, K.M.6
Simpson, C.7
Shelnutt, J.A.8
Holten, D.9
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74
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85033041600
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note
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x2-y2) should not have substantially different inherent decay times, and other short-lived excited states such as metal ↔ ring charge-transfer states should be at considerably higher energy.
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