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Volumn 47, Issue 36, 2008, Pages 6892-6896

Bent-core mesogens with branched carbosilane termini: Flipping suprastructural chirality without reversing polarity

Author keywords

Chirality; Electrooptics; Ferroelectric switching; Liquid crystals; Phase transitions

Indexed keywords

ENANTIOMERS; STEREOCHEMISTRY;

EID: 53249111755     PISSN: 14337851     EISSN: None     Source Type: Journal    
DOI: 10.1002/anie.200800814     Document Type: Article
Times cited : (17)

References (40)
  • 7
    • 53249096943 scopus 로고    scopus 로고
    • The origin of supermolecular chirality is described in Figures S1 and S2 in the Supporting Information. Due to the opposing definitions of the term dipole moment in chemistry and physics, it is proposed that the bend direction is used for the definition of layer chirality in Figure S1.
    • The origin of supermolecular chirality is described in Figures S1 and S2 in the Supporting Information. Due to the opposing definitions of the term "dipole moment" in chemistry and physics, it is proposed that the bend direction is used for the definition of layer chirality in Figure S1.
  • 20
    • 53249116751 scopus 로고    scopus 로고
    • [6d]
    • [6d]
  • 25
    • 33645025102 scopus 로고    scopus 로고
    • The nanosegregated siloxane sublayers were directly observed by diffuse scattering in the wide-angle region of X-ray scattering: C. Keith, R. Amaranatha Reddy, A. Hauser, U. Baumeister, C. Tschierske, J. Am. Chem. Soc. 2006, 128, 3051
    • The nanosegregated siloxane sublayers were directly observed by diffuse scattering in the wide-angle region of X-ray scattering: C. Keith, R. Amaranatha Reddy, A. Hauser, U. Baumeister, C. Tschierske, J. Am. Chem. Soc. 2006, 128, 3051.
  • 29
    • 53249116749 scopus 로고    scopus 로고
    • F that describes a specific state/phase structure.
    • F that describes a specific state/phase structure.
  • 30
    • 53249114797 scopus 로고    scopus 로고
    • Note that only synclinic organization was reported for columnar phases with an oblique lattice presumably due to the strong interribbon frustration in an anticlinic organization. See Ref, 6b, 15] Calculated using cosθ, d/L, θ, 43°; the molecular geometry was optimized by the employment of MOPAC calculations using the AM1 Hamiltonian. The molecular length (L, 6.18 nm) is equal to the sum of the length of the molecular long axis from the molecular modeling (5.94 nm) and two times of the van der Waals radius (0.12nm) of the hydrogen atom
    • Note that only synclinic organization was reported for columnar phases with an oblique lattice presumably due to the strong interribbon frustration in an anticlinic organization. See Ref. [6b]. [15] Calculated using cosθ = d/L, θ = 43°; the molecular geometry was optimized by the employment of MOPAC calculations using the AM1 Hamiltonian. The molecular length (L = 6.18 nm) is equal to the sum of the length of the molecular long axis from the molecular modeling (5.94 nm) and two times of the van der Waals radius (0.12nm) of the hydrogen atom.
  • 31
    • 53249102730 scopus 로고    scopus 로고
    • It is possible that in the field-induced FE state the layer modulation could be not completely removed. Therefore, the synclinic FE structure induced from the ColobPA phase is assigned as, or, )-SmC sPF-like so that it can be distinguished from, or, )-SmCsPF structures, induced in the nonmodulated smectic phases SmCsPFE phases of compounds 1 and 2, where such layer modulations can be excluded
    • FE phases of compounds 1 and 2), where such layer modulations can be excluded.
  • 32
    • 53249122488 scopus 로고    scopus 로고
    • This is achieved by cooling the isotropic liquid under a square electric field (± 30 V, 10 Hz) and then switching to a triangular electric field ± 30 Vpp, 10 Hz
    • This is achieved by cooling the isotropic liquid under a square electric field (± 30 V, 10 Hz) and then switching to a triangular electric field (± 30 Vpp, 10 Hz).
  • 33
    • 53249116750 scopus 로고    scopus 로고
    • The application of a square-wave field always results in single-peak switching since there is no time (at 0 V) to allow polar states to relax to the ground-state AF structure. Hence, under a square-wave field ferroelectric and antiferroelectric switching cannot be distinguished, and therefore the term polar switching (PS) is used here
    • The application of a square-wave field always results in single-peak switching since there is no time (at 0 V) to allow polar states to relax to the ground-state AF structure. Hence, under a square-wave field ferroelectric and antiferroelectric switching cannot be distinguished, and therefore the term polar switching (PS) is used here.
  • 34
    • 53249110840 scopus 로고    scopus 로고
    • It should be noted that the initial application of a square-wave electric field leads to AF switching from ColobPA to SmC sPF-like structures by rotation around the molecular long axis, and polar switching by rotation about a cone occurs subsequently as the sign of the electric field is changed
    • F-like structures by rotation around the molecular long axis, and polar switching by rotation about a cone occurs subsequently as the sign of the electric field is changed.
  • 39
    • 53249083549 scopus 로고    scopus 로고
    • F phase was recently reported, which probably results from the reorganization of molecules in anticlinic interfaces upon the application of a dynamic ac field: R. Amaranatha Reddy, M. W. Schröder, M. Bodyagin, H. Kresse, S. Diele, G. Pelzl, W. Weissflog, Angew. Chem. 2005, 117, 784;
    • F phase was recently reported, which probably results from the reorganization of molecules in anticlinic interfaces upon the application of a dynamic ac field: R. Amaranatha Reddy, M. W. Schröder, M. Bodyagin, H. Kresse, S. Diele, G. Pelzl, W. Weissflog, Angew. Chem. 2005, 117, 784;


* 이 정보는 Elsevier사의 SCOPUS DB에서 KISTI가 분석하여 추출한 것입니다.