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Volumn 19, Issue 4, 2007, Pages 694-710

Ferroelectric and antiferroelectric smectic and columnar liquid crystalline phases formed by silylated and non-silylated molecules with fluorinated bent cores

Author keywords

[No Author keywords available]

Indexed keywords

AROMATIC CORES; ELECTROOPTICAL INVESTIGATIONS; FERROELECTRIC SWITCHING; OBLIQUE LATTICE; OLIGOSILOXANE;

EID: 33947155857     PISSN: 08974756     EISSN: None     Source Type: Journal    
DOI: 10.1021/cm061749x     Document Type: Article
Times cited : (45)

References (104)
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    • Lagerwall, S.T. In Handbook of liquid crystals; Demus, D., Goodby, J. W., Gray, G. W., Spiess, H.-W., Vill, V., Eds.; Wiley-VCH: Weinheim, 1998; Vol. 2B, pp 515-664.
    • (1998) Handbook of liquid crystals , vol.2 B , pp. 515-664
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    • Ros, M. B.; Serrano, J. L.; de la Fuente, M. R.; Folcia, C. L. J. Mater. Chem. 2005, 15, 5093-5098.
    • (c) Ros, M. B.; Serrano, J. L.; de la Fuente, M. R.; Folcia, C. L. J. Mater. Chem. 2005, 15, 5093-5098.
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    • Green, M. M, Nolte, R. J. M, Meijer, E. W, Eds, Wiley: New York, Materials-Chirality, pp
    • (b) Walba, D. M. Topics in Stereochemistry, Green, M. M., Nolte, R. J. M., Meijer, E. W., Eds.; Wiley: New York, 2003; Vol. 42 (Materials-Chirality), pp 475-518.
    • (2003) Topics in Stereochemistry , vol.42 , pp. 475-518
    • Walba, D.M.1
  • 12
    • 33947188965 scopus 로고    scopus 로고
    • The subscript F' is used for FE switching phases with a proven FE ground-state structure in the bulk before application of an external field, see ref 81, for mesophases where a FE switching is found experimentally, but where the virgin ground-state structure is unknown or nonpolar the subscript FE is used, as suggested in ref 5d
    • The subscript "F' is used for FE switching phases with a proven FE ground-state structure in the bulk (before application of an external field, see ref 81); for mesophases where a FE switching is found experimentally, but where the virgin ground-state structure is unknown or nonpolar the subscript FE is used, as suggested in ref 5d.
  • 13
    • 0343431504 scopus 로고    scopus 로고
    • Examples of non-silylated FE switching bent-core materials: (a) Walba, D. M.; Körblova, E.; Shao, R.; Maclennan, J. E.; Link, D. R.; Glaser, M. A.; Clark, N. A. Science 2000, 288, 2181-2184.
    • Examples of non-silylated FE switching bent-core materials: (a) Walba, D. M.; Körblova, E.; Shao, R.; Maclennan, J. E.; Link, D. R.; Glaser, M. A.; Clark, N. A. Science 2000, 288, 2181-2184.
  • 25
    • 0034625939 scopus 로고    scopus 로고
    • Dark conglomerate phase of non-silylated molecules : (a) Thisayukta, J.; Nakayama, Y.; Kawauchi, S.; Takezoe, H.; Watanabe, J. J. Am. Chem. Soc. 2000, 122, 7441-7448.
    • Dark conglomerate phase of non-silylated molecules : (a) Thisayukta, J.; Nakayama, Y.; Kawauchi, S.; Takezoe, H.; Watanabe, J. J. Am. Chem. Soc. 2000, 122, 7441-7448.
  • 34
    • 0033646923 scopus 로고    scopus 로고
    • [*] phases: (a) Heppke, G.; Parghi, D. D.; Sawade, H. Liq. Cryst. 2000, 27, 313-320.
    • [*] phases: (a) Heppke, G.; Parghi, D. D.; Sawade, H. Liq. Cryst. 2000, 27, 313-320.
  • 62
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    • A).
    • A).
  • 63
    • 0032003493 scopus 로고    scopus 로고
    • Examples of columnar phases formed by bent-core molecules: (a) Watanabe, J.; Niori, T.; Sekine, T.; Takezoe, H. Jpn. J. Appl. Phys. 1998, 37, L139-L142.
    • Examples of columnar phases formed by bent-core molecules: (a) Watanabe, J.; Niori, T.; Sekine, T.; Takezoe, H. Jpn. J. Appl. Phys. 1998, 37, L139-L142.
  • 68
    • 0042320354 scopus 로고    scopus 로고
    • See ref 21b. (h) Nguyen, H. T.; Bedel, J. P.; Rouillon, J. C.; Marcerou, J. P.; Achard, M. F. Pramana, J. Phys. 2003, 61, 395-404.
    • (f) See ref 21b. (h) Nguyen, H. T.; Bedel, J. P.; Rouillon, J. C.; Marcerou, J. P.; Achard, M. F. Pramana, J. Phys. 2003, 61, 395-404.
  • 71
    • 84944812512 scopus 로고    scopus 로고
    • mol corrected for the less dense packing in the liquid crystal assuming the packing coefficient to be intermediate between the average packing coefficient in the crystalline (k = 0.7) and liquid state (k = 0.55) (Kitaigorodski, A. I. Molekülkristalle, Akademieverlag Berlin, 1979, see Table S2).
    • mol corrected for the less dense packing in the liquid crystal assuming the packing coefficient to be intermediate between the average packing coefficient in the crystalline (k = 0.7) and liquid state (k = 0.55) (Kitaigorodski, A. I. "Molekülkristalle", Akademieverlag Berlin, 1979, see Table S2).
  • 74
    • 24144502866 scopus 로고    scopus 로고
    • Examples of polar switching columnar phases of non-silylated compounds: (a) Reddy, R. A.; Sadashiva, B. K.; Baumeister, U. J. Mater. Chem. 2005, 15, 3303-3316.
    • Examples of polar switching columnar phases of non-silylated compounds: (a) Reddy, R. A.; Sadashiva, B. K.; Baumeister, U. J. Mater. Chem. 2005, 15, 3303-3316.
  • 79
    • 33947112704 scopus 로고    scopus 로고
    • In the ColobPFE phases of 4a and 5a the splay seems to be relatively weak, as it can be removed under an electric field, leading to a FE switching smectic phase. Also, formation of an oblique lattice instead of a rectangular one is in line with a relatively weak splay of polarization
    • FE phases of 4a and 5a the splay seems to be relatively weak, as it can be removed under an electric field, leading to a FE switching smectic phase. Also, formation of an oblique lattice instead of a rectangular one is in line with a relatively weak splay of polarization.
  • 87
    • 37649031301 scopus 로고    scopus 로고
    • 7-type phases: Nakata, M.; Link, D. R.; Takanishi, Y.; Takahasi, Y.; Thisayukta, J.; Niwano.H. Coleman, D.A.; Watanabe, J.; Iida, A.; Clark, N. A.; Takezoe, H. Phys. Rev. E 2005, 71, 011705.
    • 7-type phases: Nakata, M.; Link, D. R.; Takanishi, Y.; Takahasi, Y.; Thisayukta, J.; Niwano.H. Coleman, D.A.; Watanabe, J.; Iida, A.; Clark, N. A.; Takezoe, H. Phys. Rev. E 2005, 71, 011705.
  • 88
    • 1842584226 scopus 로고    scopus 로고
    • Examples of field-induced Col to Sm transitions: (a) Ortega, J.; de la Fuente, M. R.; Etxebarria, J.; Folcia, C. L.; Diez, S.; Gallastegui, J. A.; Gimeno, N.; Ros, M. B. Phys. Rev. E 2004, 69, 011703.
    • Examples of field-induced Col to Sm transitions: (a) Ortega, J.; de la Fuente, M. R.; Etxebarria, J.; Folcia, C. L.; Diez, S.; Gallastegui, J. A.; Gimeno, N.; Ros, M. B. Phys. Rev. E 2004, 69, 011703.
  • 90
    • 33947123010 scopus 로고    scopus 로고
    • FE switching on a cone is in principle possible in flat layers as well as in modulated and undulated layers. In contrast, in AF switching modulated (columnar) phases the switching on a cone is hindered for steric reasons an unfavorable packing would arise at the inter-ribbon interfaces, and therefore, switching around the molecular long axis is observed instead of the switching on a cone
    • FE switching on a cone is in principle possible in flat layers as well as in modulated and undulated layers. In contrast, in AF switching modulated (columnar) phases the switching on a cone is hindered for steric reasons (an unfavorable packing would arise at the inter-ribbon interfaces), and therefore, switching around the molecular long axis is observed instead of the switching on a cone.
  • 91
    • 33344469328 scopus 로고    scopus 로고
    • FE switching by rotation on a cone was also observed for a FE switching columnar phase of bent-core dimesogens: Umadevi, S, Jakli, A, Sadashiva, B. K. Soft Matter 2006, 2, 215-222
    • FE switching by rotation on a cone was also observed for a FE switching columnar phase of bent-core dimesogens: Umadevi, S.; Jakli, A.; Sadashiva, B. K. Soft Matter 2006, 2, 215-222.
  • 92
    • 2442639044 scopus 로고    scopus 로고
    • Examples for switching of suprastructural chirality by collective rotation around the long axis: (a) Schröder, M. W.; Diele, S.; Pelzl, G.; Weissflog, W. ChemPhysChem 2004, 5, 99-103.
    • Examples for switching of suprastructural chirality by collective rotation around the long axis: (a) Schröder, M. W.; Diele, S.; Pelzl, G.; Weissflog, W. ChemPhysChem 2004, 5, 99-103.
  • 97
    • 33947144540 scopus 로고    scopus 로고
    • This mesophase stabilizing effect was also observed for compounds of structure 2 (Chart 1),8d.20,21,30 whereas in calamitic mesogens lateral F substituents usually reduce the transition temperatures: Takeshi, I. In Organofluorine Chemistry: Principles and Commercial Applications; Banks, R.E, et al, Eds, Plenum Press: New York, 1994; pp 263-286
    • 8d.20,21,30 whereas in calamitic mesogens lateral F substituents usually reduce the transition temperatures: Takeshi, I. In Organofluorine Chemistry: Principles and Commercial Applications; Banks, R.E., et al., Eds.; Plenum Press: New York, 1994; pp 263-286.
  • 99
    • 33947127514 scopus 로고    scopus 로고
    • aPA structure obtained at 0 V should be the same as that proposed for the dark conglomerate textures in the ground state of these mesophases with the difference that it is not optically isotropic.
    • aPA structure obtained at 0 V should be the same as that proposed for the dark conglomerate textures in the ground state of these mesophases with the difference that it is not optically isotropic.
  • 102
    • 33947176986 scopus 로고    scopus 로고
    • The smooth texture under the applied field (Figure 13b) is replaced by a stripe texture at 0 V Figure 13c, Such stripe pattern could have different reasons. One possibility is that the size of the [SmCsP F]sPA domains under the field is larger than the size of the SmCsPF layer stacks in the [SmC sPF]sPA structure at 0 V
    • A structure at 0 V.
  • 103
    • 33947120534 scopus 로고    scopus 로고
    • The absence of an odd-even effect (see ref 12) is an additional indication of the week coupling between the layers
    • The absence of an odd-even effect (see ref 12) is an additional indication of the week coupling between the layers.


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