Aggregation of surfactant squaraine dyes in aqueous solution and microheterogeneous media: Correlation of aggregation behavior with molecular structure

Journal of the American Chemical Society

Volumn 118, Issue 11, 1996, Pages 2584-2594

  Chen, Huijuan ^a   Farahat, Mohammad S ^a   Law, Kock Yee ^b   Whitten, David G ^a  

^a UNIVERSITY OF ROCHESTER   (United States)

^b XEROX CORPORATION   (United States)

Author keywords

[No Author keywords available]

Indexed keywords

DYE; SQUARAINE DERIVATIVE; UNCLASSIFIED DRUG;

ARTICLE; DRUG STRUCTURE; FLUORESCENCE; PARTICLE SIZE;

EID: 0029962154     PISSN: 00027863     EISSN: None     Source Type: Journal    
DOI: 10.1021/ja9523911     Document Type: Article

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38. The biexponential nature of the excited state decay may also be caused by interconversion between close-lying electronic states after the initial excitation process, in addition to the usual deactivation channels (Jones, G. II; Farahat, M. S Adv. Electron Transfer 1993, 3, 1 and Rettig, W. Topics Curr. Chem. 1994, 169, 253). In such a case, no wavelength dependence is observed for the fluorescence decay parameters when only one of the excited states involved is emissive (Lippert, E.; Rettig, W.; Bonacic-Koutecky, V.; Miehe, J. Adv. Chem. Phys. 1987, 68, 1).
39. The biexponential nature of the excited state decay may also be caused by interconversion between close-lying electronic states after the initial excitation process, in addition to the usual deactivation channels (Jones, G. II; Farahat, M. S Adv. Electron Transfer 1993, 3, 1 and Rettig, W. Topics Curr. Chem. 1994, 169, 253). In such a case, no wavelength dependence is observed for the fluorescence decay parameters when only one of the excited states involved is emissive (Lippert, E.; Rettig, W.; Bonacic-Koutecky, V.; Miehe, J. Adv. Chem. Phys. 1987, 68, 1).
40. The biexponential nature of the excited state decay may also be caused by interconversion between close-lying electronic states after the initial excitation process, in addition to the usual deactivation channels (Jones, G. II; Farahat, M. S Adv. Electron Transfer 1993, 3, 1 and Rettig, W. Topics Curr. Chem. 1994, 169, 253). In such a case, no wavelength dependence is observed for the fluorescence decay parameters when only one of the excited states involved is emissive (Lippert, E.; Rettig, W.; Bonacic-Koutecky, V.; Miehe, J. Adv. Chem. Phys. 1987, 68, 1).
41. Multiphoton ionization may be dismissed based on the lack of quadratic dependence of the new absorption on laser intensity Formation of dye radicals by an excited state annihilation mechanism may also be ruled out, since the observed spectra at long times after laser excitation appear only as positive bands indicating an oscillator strength greater than that of the ground state - an unlikely situation.
42. Formation of the monomeric form would give rise to a distinctive new absorbance peak in the 640 nm region, contrary to the observed results (Figure 7).
43. Observation of two-exciton bands in pump-probe experiments and other non-linear processes have been explored both theoretically (Spano, F. C. Chem. Phys. Lett. 1995, 234, 29 and Mukamel, S. Principles of Nonlinear Optical Spectroscopy; Oxford University: Oxford, 1995) and experimentally (VanBurgel, M.; Wiersma, D. A ; Duppen, K. J. Chem. Phys. 1995, 102, 20 and Horng, M. L.; Quitevis, E. L. J. Phys. Chem. 1993, 97, 12403).
44. Observation of two-exciton bands in pump-probe experiments and other non-linear processes have been explored both theoretically (Spano, F. C. Chem. Phys. Lett. 1995, 234, 29 and Mukamel, S. Principles of Nonlinear Optical Spectroscopy; Oxford University: Oxford, 1995) and experimentally (VanBurgel, M.; Wiersma, D. A ; Duppen, K. J. Chem. Phys. 1995, 102, 20 and Horng, M. L.; Quitevis, E. L. J. Phys. Chem. 1993, 97, 12403).
45. Observation of two-exciton bands in pump-probe experiments and other non-linear processes have been explored both theoretically (Spano, F. C. Chem. Phys. Lett. 1995, 234, 29 and Mukamel, S. Principles of Nonlinear Optical Spectroscopy; Oxford University: Oxford, 1995) and experimentally (VanBurgel, M.; Wiersma, D. A ; Duppen, K. J. Chem. Phys. 1995, 102, 20 and Horng, M. L.; Quitevis, E. L. J. Phys. Chem. 1993, 97, 12403).
46. Observation of two-exciton bands in pump-probe experiments and other non-linear processes have been explored both theoretically (Spano, F. C. Chem. Phys. Lett. 1995, 234, 29 and Mukamel, S. Principles of Nonlinear Optical Spectroscopy; Oxford University: Oxford, 1995) and experimentally (VanBurgel, M.; Wiersma, D. A ; Duppen, K. J. Chem. Phys. 1995, 102, 20 and Horng, M. L.; Quitevis, E. L. J. Phys. Chem. 1993, 97, 12403).
47. In order to investigate the excitonic interactions in squaraine dyes. a model series of covalently linked dimeric squaraines has been synthesized and their steady state and time resolved properties have been investigated. The pump-probe spectra for these molecules show two-exciton absorption bands, and they can be modeled using non-linear optical response theory (see Mukamel, S. in ref 41). Farahat, M. S.; Liang, K.; Mukamel, S.; Whitten, D. G. Manuscript in preparation.
48. In order to investigate the excitonic interactions in squaraine dyes. a model series of covalently linked dimeric squaraines has been synthesized and their steady state and time resolved properties have been investigated. The pump-probe spectra for these molecules show two-exciton absorption bands, and they can be modeled using non-linear optical response theory (see Mukamel, S. in ref 41). Farahat, M. S.; Liang, K.; Mukamel, S.; Whitten, D. G. Manuscript in preparation.