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Volumn 45, Issue 42, 2006, Pages 7026-7030

Fluorescent H-aggregates of merocyanine dyes

Author keywords

Chromophores; Dye aggregates; Dyes pigments; Fluorescence; Supramolecular chemistry

Indexed keywords

CHROMOPHORES; DIMERS; EXCITONS; FLUORESCENCE; HYDROGEN; SUPRAMOLECULAR CHEMISTRY;

EID: 33750629321     PISSN: 14337851     EISSN: None     Source Type: Journal    
DOI: 10.1002/anie.200602286     Document Type: Article
Times cited : (355)

References (42)
  • 4
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    • M. Kasha, H. R. Rawls, M. A. El-Bayoumi, Pure Appl. Chem. 1965, 11, 371-392. For good reasons, the expressions H- and J-aggregate have been avoided in this seminal paper on the theoretical description of dimer aggregate spectra by exciton theory. According to this theory as well as more elaborate ones (see Ref. [3]), for the majority of possible dimer geometries two absorption bands arise, one at higher ("H-band") and one at lower ("J-band") energy relative to the monomer band. Thus, spectra of perfect H- and J-aggregates (where the transition to one of the two exciton states is fully forbidden) will only occur for the special situation of a perfect parallel or antiparallel orientation of the two dyes in the dimer aggregate. Despite these facts, dye aggregates are most commonly classified as H- and J-type on the basis of their most intense absorption band. Accordingly, we regard aggregates of merocyanines 1-3 as typical representatives of H-type dimer aggregates.
    • (1965) Pure Appl. Chem. , vol.11 , pp. 371-392
    • Kasha, M.1    Rawls, H.R.2    El-Bayoumi, M.A.3
  • 6
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    • (Ed.: T. Kobayashi), World Scientific, Singapore
    • b) H. Kuhn, C. Kuhn in J-Aggregates (Ed.: T. Kobayashi), World Scientific, Singapore 1996, pp. 1-40;
    • (1996) J-Aggregates , pp. 1-40
    • Kuhn, H.1    Kuhn, C.2
  • 7
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    • DOI:10.1016/j.chemphys.2006.07.023
    • for a recent study by time-dependent quantum methodology with special emphasis on rotational displacements in perylenebisimide aggregates, see: c) J. Seibt, P. Marquetand, V. Engel, Z. Chen, V. Dehm, F. Würthner, J. Chem. Phys., DOI:10.1016/j.chemphys.2006.07.023.
    • J. Chem. Phys.
    • Seibt, J.1    Marquetand, P.2    Engel, V.3    Chen, Z.4    Dehm, V.5    Würthner, F.6
  • 10
    • 0004283576 scopus 로고    scopus 로고
    • (Ed.: T. Kobayashi), World Scientific, Singapore
    • c) J-Aggregates (Ed.: T. Kobayashi), World Scientific, Singapore, 1996.
    • (1996) J-Aggregates
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    • 0038587628 scopus 로고    scopus 로고
    • Angew. Chem. Int. Ed. 2003, 42, 2080-2083.
    • (2003) Angew. Chem. Int. Ed. , vol.42 , pp. 2080-2083
  • 29
    • 33750625839 scopus 로고    scopus 로고
    • PhD thesis, Technische Universität Kaiserslautern
    • U. Rösch, PhD thesis, Technische Universität Kaiserslautern, 2006.
    • (2006)
    • Rösch, U.1
  • 31
    • 33750615957 scopus 로고    scopus 로고
    • note
    • [11] in this study the nonlinear regression analysis was performed by taking into account the complete set of spectral data.
  • 32
    • 33750610409 scopus 로고    scopus 로고
    • note
    • -1 for the dimer band. All fluorescence measurements have been performed on a Jobin-Yvon Fluorolog 3-22 Tau instrument. The decay times were evaluated by applying single exponentials to the time-resolved measurements in the frequency domain.
  • 33
    • 33750611699 scopus 로고    scopus 로고
    • note
    • -30 C m at a torsion angle of α = 10° calculated at the MP2/6-31G(d,p) level of theory. However, we would like to point out that we are not yet sure if the small transition dipole moment for the lower energy excitonic transition that arises from such a small torsional twist of 10° is sufficient to explain the observed intensity of the dimer fluorescence. Alternatively, a relaxation of the Franck-Condon excited state could be taking place that affords an even more twisted excited state geometry which exhibits an increased radiative transition probability.
  • 34
    • 15744375697 scopus 로고    scopus 로고
    • Gaussian, Inc., Wallingford CT
    • All ab initio calculations were done with Gaussian 03, Revision C.02, Gaussian, Inc., Wallingford CT 2004.
    • (2004) Gaussian 03, Revision C.02
  • 39
    • 0000153165 scopus 로고    scopus 로고
    • see, for example
    • Intense fluorescence has been reported for several merocyanine dyes upon rigidification in frozen solution, the solid state, or in an organogel; see, for example, a) F. Würthner, R. Sens, K.-H. Etzbach, G. Seybold, Angew. Chem. 1999, 111, 1753-1757;
    • (1999) Angew. Chem. , vol.111 , pp. 1753-1757
    • Würthner, F.1    Sens, R.2    Etzbach, K.-H.3    Seybold, G.4
  • 40
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    • Angew. Chem. Int. Ed. 1999, 38, 1649-1652;
    • (1999) Angew. Chem. Int. Ed. , vol.38 , pp. 1649-1652
  • 42
    • 33750631518 scopus 로고    scopus 로고
    • note
    • An even longer fluorescence lifetime of 11.2 ns has been observed for dimers of dye 3, see Ref. [13].


* 이 정보는 Elsevier사의 SCOPUS DB에서 KISTI가 분석하여 추출한 것입니다.