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Volumn 20, Issue 1, 2008, Pages 29-31

Simple spacer-free dye-polyelectrolyte ionic complex: Side-chain liquid crystal order with high and stable photoinduced birefringence

Author keywords

[No Author keywords available]

Indexed keywords

BIREFRINGENCE; COMPLEXATION; MOLECULAR STRUCTURE; THERMOTROPIC LIQUID CRYSTALS; X RAY DIFFRACTION;

EID: 39149124453     PISSN: 08974756     EISSN: None     Source Type: Journal    
DOI: 10.1021/cm702525y     Document Type: Article
Times cited : (60)

References (62)
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    • Some recent reviews: (a) Natansohn, A.; Rochon, P. Chem. Rev. 2002, 102, 4139.
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    • Advincula, R., Polyelectrolyte Layer-by-Layer Self-Assembled Multilayers Containing Azobenzene Dyes. In Handbook of Polyelectrolytes and Their Applications; Tripathy, S. K., Kumar, J., Nalwa, H. S., Eds.; American Scientific: Stevenson Ranch, CA, 2002;1, Chapter 3, p 65.
    • (e) Advincula, R., Polyelectrolyte Layer-by-Layer Self-Assembled Multilayers Containing Azobenzene Dyes. In Handbook of Polyelectrolytes and Their Applications; Tripathy, S. K., Kumar, J., Nalwa, H. S., Eds.; American Scientific: Stevenson Ranch, CA, 2002;Vol. 1, Chapter 3, p 65.
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    • See for example: (a) Bosshard, Ch, Sutter, K, Prêtre, Ph, Hulliger, J, Flörsheimer, M, Kaatz, P, Günter, P, Eds, Gordon and Breach: New York
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    • (1995) Organic Nonlinear Optical Materials
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    • In terms of ease of synthesis, mention may be made as well of the ionic self-assembly of charged azo-dyes with oppositely charged small molecules (generally with flexible alkyl chains present), some of which also show LC behavior along with high dichroic ratios: (a) Zakrevskyy, Y.; Stumpe, J.; Faul, C. F. J. Adv. Mater. 2006, 18, 2133.
    • In terms of ease of synthesis, mention may be made as well of the ionic self-assembly of charged azo-dyes with oppositely charged small molecules (generally with flexible alkyl chains present), some of which also show LC behavior along with high dichroic ratios: (a) Zakrevskyy, Y.; Stumpe, J.; Faul, C. F. J. Adv. Mater. 2006, 18, 2133.
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    • (b) Demus, D.; Goodby, J. W.; Gray, G. W.; Spiess, H. W.; Vill, V., Eds. Handbook of Liquid Crystals; Wiley-VCH: Weinheim, Germany, 1998; Vol. 4.
    • (1998) Handbook of Liquid Crystals , vol.4
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    • McArdle, C. B, Ed, Chapman and Hall: New York, and references therein
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    • (1989) Side Chain Liquid Crystal Polymers , pp. 49-53
    • Percec, V.1    Pugh, C.2
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    • It has long been known that a sufficiently long flexible tail in the side chain can also allow LC order to appear, as observed for comb polymers having simple alkyl side chains. Plate, N. A.;Shibaev, V. P. J. Polym. Sci., Macromol. Rev. 1974, 5, 117. Furthermore, many early SCLCPs consist of directly attached side-chain rigid groups with long alkyl chains (see, for example, refs 7-10).
    • It has long been known that a sufficiently long flexible tail in the side chain can also allow LC order to appear, as observed for comb polymers having simple alkyl side chains. Plate, N. A.;Shibaev, V. P. J. Polym. Sci., Macromol. Rev. 1974, 5, 117. Furthermore, many early SCLCPs consist of directly attached side-chain rigid groups with long alkyl chains (see, for example, refs 7-10).
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    • Some recent reviews: (a) Binnemans, K. Chem Rev. 2005, 105, 4148.
    • Some recent reviews: (a) Binnemans, K. Chem Rev. 2005, 105, 4148.
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    • Similar H-bond complexes of phenol and pyridyl derivatives to poly(2dimethylaminoethyl methacrylate) and poly(2-hydroxyethyl methacrylate), respectively, reported to be nematic, involve a short spacer in the pendant group of the polymer and less than equimolar complexation. Malik, S.; Dhal, K.; Mashelkar, R. A. Macromolecules 1995, 28, 2159.
    • Similar H-bond complexes of phenol and pyridyl derivatives to poly(2dimethylaminoethyl methacrylate) and poly(2-hydroxyethyl methacrylate), respectively, reported to be nematic, involve a short spacer in the pendant group of the polymer and less than equimolar complexation. Malik, S.; Dhal, K.; Mashelkar, R. A. Macromolecules 1995, 28, 2159.
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    • See the Supporting Information for details
    • See the Supporting Information for details.
  • 49
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    • -1 was determined for this system, orders of magnitude faster than typical rates for other MO-based azo dyes: Barrett, C.; Natansohn, A.; Rochon, P. Chem. Mater. 1995, 7, 899 and ref 3c. This suggests that the ionic interactions alter the electronic structure of the chromophore significantly.
    • -1 was determined for this system, orders of magnitude faster than typical rates for other MO-based azo dyes: Barrett, C.; Natansohn, A.; Rochon, P. Chem. Mater. 1995, 7, 899 and ref 3c. This suggests that the ionic interactions alter the electronic structure of the chromophore significantly.
  • 50
    • 39149132046 scopus 로고    scopus 로고
    • The PIB depends on the exposure dose (power of writing laser multiplied by writing time) and the intrinsic response of the chromophore at the writing wavelength used photoisomerization quantum yield, cis, trans isomerization rate, etc, Thus, comparisons possible depend on the information available and, in some cases, are extrapolated. A high exposure dose may also cause irreversible changes in the exposed region that affect potential relaxation processes
    • The PIB depends on the exposure dose (power of writing laser multiplied by writing time) and the intrinsic response of the chromophore at the writing wavelength used (photoisomerization quantum yield, cis - trans isomerization rate, etc.). Thus, comparisons possible depend on the information available and, in some cases, are extrapolated. A high exposure dose may also cause irreversible changes in the exposed region that affect potential relaxation processes.
  • 53
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    • Polyelectrolyte layer-by-layer assemblies involving covalently or noncovalently bound dyes can also show interesting photoinduced alignment see, for example, ref 1e, however, to the best of our knowledge, there are no reports of high PIB, only high dichroic ratios, which are not directly comparable
    • Polyelectrolyte layer-by-layer assemblies involving covalently or noncovalently bound dyes can also show interesting photoinduced alignment (see, for example, ref 1e); however, to the best of our knowledge, there are no reports of high PIB, only high dichroic ratios, which are not directly comparable.
  • 57
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    • In a novel approach to obtain high birefringence changes, an azotolane film was prealigned, providing extremely high birefringence, which could then be erased by applying a laser beam, a Okano, K, Shishido, A, Tsutsumi, O, Shiono, T, Ikeda, T. J. Mater. Chem. 2005, 15, 3395
    • In a novel approach to obtain high birefringence changes, an azotolane film was prealigned, providing extremely high birefringence, which could then be erased by applying a laser beam, (a) Okano, K.; Shishido, A.; Tsutsumi, O.; Shiono, T.; Ikeda, T. J. Mater. Chem. 2005, 15, 3395.
  • 62
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    • In the final stage of the review process of the present contribution, a closely related paper showing the LC character and photoresponsiveness of a very similar complex appeared in the literature: Xiao, S, Lu, X, Lu, Q. Macromolecules 2007, 40, 7944
    • In the final stage of the review process of the present contribution, a closely related paper showing the LC character and photoresponsiveness of a very similar complex appeared in the literature: Xiao, S.; Lu, X.; Lu, Q. Macromolecules 2007, 40, 7944.


* 이 정보는 Elsevier사의 SCOPUS DB에서 KISTI가 분석하여 추출한 것입니다.