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Volumn 8, Issue 6, 2008, Pages 1660-1666

Consecutive conformational transitions and deaggregation of multiple-helical poly(diacetylene)s

Author keywords

[No Author keywords available]

Indexed keywords

ACETYLENE; BIOPOLYMERS; CONJUGATED POLYMERS; MONOMERS;

EID: 48449087450     PISSN: 15306984     EISSN: None     Source Type: Journal    
DOI: 10.1021/nl080478h     Document Type: Article
Times cited : (33)

References (50)
  • 1
    • 10644284474 scopus 로고
    • Lakes, R. Nature 1993, 361, 511.
    • (1993) Nature , vol.361 , pp. 511
    • Lakes, R.1
  • 7
    • 36849057990 scopus 로고    scopus 로고
    • 1st ed, Hecht, S, Huc, I, Eds, Wiley-VCH: Weinheim, Germany
    • Foldamers: Structure, Properties, and Applications, 1st ed.; Hecht, S., Huc, I., Eds.; Wiley-VCH: Weinheim, Germany, 2007.
    • (2007) Foldamers: Structure, Properties, and Applications
  • 38
    • 61449144833 scopus 로고    scopus 로고
    • See Supporting Information
    • See Supporting Information.
  • 41
    • 61449120452 scopus 로고    scopus 로고
    • Consistent with our own self-assembly model (ref 29) and in analogy to the model proposed by Boden et al. (ref 40), the terms tapes, ribbons, and fibrils are explicitly used to describe single β-sheets, stacked dimers of β-sheets, as well as higher aggregates via stacking of β-sheets, respectively.
    • Consistent with our own self-assembly model (ref 29) and in analogy to the model proposed by Boden et al. (ref 40), the terms tapes, ribbons, and fibrils are explicitly used to describe single β-sheets, stacked dimers of β-sheets, as well as higher aggregates via stacking of β-sheets, respectively.
  • 48
    • 0020770309 scopus 로고    scopus 로고
    • A few reports concerning the CD activity of poly(diacetylene)s have been published previously (refs 36, 37, 44-47, With the exception of the investigations by Ando et al. and Hanks et al, refs 36 and 37, however, only poorly defined CD signatures were observed that were typically not interpretable and probably resulted from a circular intensity differential scattering (cids) contribution of large, ill-defined superstructures. This conclusion is, for example, illustrated by the results reported by Liu et al, ref 47, who observed CD activity in LB films of achiral poly(diacetylene)s; the CD activity was irreproducible and depended, e.g, on the subphase; TEM images showed supposedly helical superstructures with a pitch on the order of the wavelength of the absorbed light. For more information on cids, see Bustamante, C. Tinoco, I, Jr, Maestre, M. F. Proc. Natl. Acad. Sci. U.S.A. 1983, 80, 3568
    • A few reports concerning the CD activity of poly(diacetylene)s have been published previously (refs 36, 37, 44-47). With the exception of the investigations by Ando et al. and Hanks et al. (refs 36 and 37), however, only poorly defined CD signatures were observed that were typically not interpretable and probably resulted from a circular intensity differential scattering (cids) contribution of large, ill-defined superstructures. This conclusion is, for example, illustrated by the results reported by Liu et al. (ref 47), who observed CD activity in LB films of achiral poly(diacetylene)s; the CD activity was irreproducible and depended, e.g., on the subphase; TEM images showed supposedly helical superstructures with a pitch on the order of the wavelength of the absorbed light. For more information on cids, see Bustamante, C. Tinoco, I., Jr.; Maestre, M. F. Proc. Natl. Acad. Sci. U.S.A. 1983, 80, 3568.
  • 49
    • 61449174158 scopus 로고    scopus 로고
    • The color changes may look similar to previously published examples (refs 32-35) at first sight, but there are important differences. Solutions of P1 or P2 in chlorinated solvents maintained their blue-purple color, and only the addition of strong hydrogen bond breaking agents induced the color changes. The transition from the blue to the yellow form clearly proceeded in two consecutive steps, with the red form as an actual intermediate. A similar supposedly two-step transition was recently described by Dautel, Moreau et al. (ref 28), but the reported UV spectra showed mixtures of different species and were, hence, difficult to interpret.
    • The color changes may look similar to previously published examples (refs 32-35) at first sight, but there are important differences. Solutions of P1 or P2 in chlorinated solvents maintained their blue-purple color, and only the addition of strong hydrogen bond breaking agents induced the color changes. The transition from the blue to the yellow form clearly proceeded in two consecutive steps, with the red form as an actual intermediate. A similar supposedly two-step transition was recently described by Dautel, Moreau et al. (ref 28), but the reported UV spectra showed mixtures of different species and were, hence, difficult to interpret.
  • 50
    • 0028272646 scopus 로고    scopus 로고
    • Giesa et al. have conclusively shown that this explanation falls short anyway; UV absorption maxima above about 550 nm probably result from interactions of poly(diacetylene) chromophores in the crystalline or aggregated state; see Giesa, R. R. Schulz, C. Polym. Int. 1994, 33, 43.
    • Giesa et al. have conclusively shown that this explanation falls short anyway; UV absorption maxima above about 550 nm probably result from interactions of poly(diacetylene) chromophores in the crystalline or aggregated state; see Giesa, R. R. Schulz, C. Polym. Int. 1994, 33, 43.


* 이 정보는 Elsevier사의 SCOPUS DB에서 KISTI가 분석하여 추출한 것입니다.