Mechanisms of excited-state energy-transfer grating in linear versus branched multiporphyrin arrays

Journal of Physical Chemistry B

Volumn 105, Issue 22, 2001, Pages 5341-5352

  Lammi, Robin K ^a   Wagner, Richard W ^b   Ambroise, Arounaguiry ^b   Diers, James R ^c   Bocian, David F ^c   Holten, Dewey ^a   Lindsey, Jonathan S ^b  

^a WASHINGTON UNIVERSITY   (United States)

^b NORTH CAROLINA STATE UNIVERSITY   (United States)

^c UNIVERSITY OF CALIFORNIA   (United States)

Author keywords

[No Author keywords available]

Indexed keywords

MOLECULAR PHOTONICS; MULTIPORPHYRIN ARRAYS; TIME RESOLVED OPTICAL SPECTROSCOPY;

CHARGE TRANSFER; ELECTROCHEMISTRY; ENERGY TRANSFER; OPTICAL MICROSCOPY; OPTOELECTRONIC DEVICES; REDOX REACTIONS;

ORGANIC COMPOUNDS;

EID: 0035822212     PISSN: 10895647     EISSN: None     Source Type: Journal    
DOI: 10.1021/jp010857y     Document Type: Article

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24. We used the term "gate" to describe these devices, in which electrochemical modulation turns the light output of the Fb porphyrin on and off.
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44. It is difficult to ascertain whether a longer-lived state forms in low yield due to a small amount of photodecomposition that often occurs in the oxidized arrays during the course of the experiments.
45. (a) The photoexcited cation radicals of monomeric porphyrins decay very rapidly to the ground electronic state, presumably via the manifold of low-lying excited states present in these species (as is evident from the weak, broad features extending past 1000 nm in the absorption spectra (ref 43)). The decays appear to occur in at least two phases, one < 1 ps and one ∼10 ps, with the lifetimes depending on the cation radical.
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47. (c) Brancato-Buentello, K. E.; Wagner, R. W.; Lindsey, J. S.; Scheidt, W. R.; Holten, D. In preparation.
48. + of ∼20 ps might have been expected based on the trend set by the other members of the oxidized-triad series and the analogous trend in energy-transfer rates in the neutral forms (ref 28) of the same triads. Thus, the measured time constant of ∼10 ps is only a factor of 2 or so shorter than the value expected based on other work.
49. + hole-transfer using the Zn porphyrin as a superexchange mediator.
50. Relative to the broad featureless excited-state absorption, the ratio of the bleachings at 516 and 550 is ∼1.5/1 in the 1.1-ns spectrum corresponding to the ratio of the Fb porphyrin ground-state bands. In the 23-ps spectrum the intensity ratio of these two features is reversed (0.9/1), consistent with the contribution of bleaching of the Zn porphyrin 550 nm Q(0,0) band and the weaker 516 nm Q(1,0) band due to the presence of Zn*.
51. +) was unavoidably excited in a significant number of molecules due to its broad absorption spectrum. The excited cation decays very quickly (ref 45), resulting in dampened signals relative to the neutral gates. It is therefore difficult to directly determine the rates of the individual processes in the oxidized gates.
52. The formation of Zn* is evidenced by the decrease in the 516/551 intensity ratio, from ∼1.5 in the 4-ps spectrum to <1 in the 48-ps trace: the 4-ps spectrum is due predominantly to BDPY* (with its prominent 516 nm-bleaching) along with some Fb* due to direct excitation of Fb in a fraction of the arrays (with its bleachings near 551 and 550 nm, as is seen in the 2.2 ns spectrum); the 48-ps spectrum has a substantial contribution from Zn* with its prominent 550 nm Q(1,0 ) bleaching relative to its 590 Q(0,0) band. These ratios and assignments are consistent with the ground-state absorption properties of each chromophore.
53. -1 is predicted for through-space energy transfer between the distant Fb and oxidized Mg porphyrins. Note that both of these values are only approximations for the Mg-porphyrin π-cation radical with its weak, broad absorption features. The dominance of the through-bond mechanism (with a lesser contribution of the Fo&dierster through-space mechanism) for energy transfer between diarylethyne-linked porphyrins has been discussed extensively (refs 28-34).
54. Lammi, R. K.; Wagner, R. W.; Abroise, A.; Diers, J. R.; Bocian, D. F.; Holten, D.; Lindsey, J. S. Chem. Phys. Lett., in press.
55. BDPY undergoes a photoinduced conformational change, resulting in two excited-state populations that differ in geometry BDPY-porphyrin couplings, and energy-transfer rates.
56. -1).
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