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Volumn 127, Issue 47, 2005, Pages 16578-16591

Carbohydrate rod conjugates: Ternary rod-coil molecules forming complex liquid crystal structures

Author keywords

[No Author keywords available]

Indexed keywords

BIREFRINGENCE; CRYSTAL STRUCTURE; DIFFERENTIAL SCANNING CALORIMETRY; HYDROPHILICITY; MOLECULAR DYNAMICS; SYNTHESIS (CHEMICAL); X RAY SCATTERING;

EID: 28444492377     PISSN: 00027863     EISSN: None     Source Type: Journal    
DOI: 10.1021/ja0535357     Document Type: Article
Times cited : (105)

References (121)
  • 4
    • 0344099416 scopus 로고    scopus 로고
    • Recent reviews about crystal engineering: (a) Braga, D. Chem. Commun. 2003, 2751-2754.
    • (2003) Chem. Commun. , pp. 2751-2754
    • Braga, D.1
  • 25
    • 0037192503 scopus 로고    scopus 로고
    • Kalo, T. Science 2002, 295, 2414-2418.
    • (2002) Science , vol.295 , pp. 2414-2418
    • Kalo, T.1
  • 39
    • 37049088112 scopus 로고
    • Carbohydrate LC incorporating terminally attached rodlike segments: (a) Müller, H.; Tschierske, C. Chem. Commun. 1995, 645-646.
    • (1995) Chem. Commun. , pp. 645-646
    • Müller, H.1    Tschierske, C.2
  • 42
  • 48
    • 0000836501 scopus 로고    scopus 로고
    • Most of the compounds are hygroscopic. To remove traces of water, the open samples were heated to 170°C for ca. 5 s; then, they were immediately covered or sealed and investigated. The weight loss corresponds to the amount of water absorbed by the material, which can be determined according to: Dunkel, R.; Hahn, M.; Borisch, K.; Neumann, B.; Rüttinger, H.-H.; Tschierske, C. Liq. Cryst. 1998, 24, 211-213. Filling of the capillaries for X-ray investigations was also done at that temperature.
    • (1998) Liq. Cryst. , vol.24 , pp. 211-213
    • Dunkel, R.1    Hahn, M.2    Borisch, K.3    Neumann, B.4    Rüttinger, H.-H.5    Tschierske, C.6
  • 51
    • 28444475098 scopus 로고    scopus 로고
    • note
    • The value h = 0.45 nin corresponds to the maximum of the wide-angle scattering in the diffraction pattern.
  • 55
    • 28444453568 scopus 로고    scopus 로고
    • note
    • This small negative deviation (d = 0.92L) is typical for LC phases with a layer structure and is due to conformational disorder of the alkyl chains.
  • 56
    • 28444494640 scopus 로고    scopus 로고
    • note
    • The mesophases reported herein represent ordered fluids, which means that there is no long-range order in atomic or molecular positions. Hence, there are no well-defined crystal-like structures, as might be suggested by the schematic models shown. Instead, there are distinct regions with enhanced concentration of aromatic cores, polar groups, and aliphatic chains. Due to this disorder, only diffuse scattering can be found in the wide-angle region of the diffraction pattern.
  • 57
    • 28444480579 scopus 로고    scopus 로고
    • note
    • The transition takes place between 102°C and 115°C on heating and cooling, with the DSC peak maximum at T = 107°C; the broadness of the transition might be due to the fact that a 3D ordered mesophase is involved in the transition and that a complete reorganization of the molecules takes place.
  • 58
    • 28444456608 scopus 로고    scopus 로고
    • note
    • hex, either from parallel to perpendicular (Figure 5 a to c) or from perpendicular to parallel (Figure 5 b to d).
  • 59
    • 0041688794 scopus 로고
    • There are only a few examples of inversion of birefringence in LC systems: (a) Pelzl, G.; Sackmann, H. Mol. Cryst. Liq. Cryst. 1971, 15, 75-87.
    • (1971) Mol. Cryst. Liq. Cryst. , vol.15 , pp. 75-87
    • Pelzl, G.1    Sackmann, H.2
  • 64
    • 28444460643 scopus 로고    scopus 로고
    • note
    • cyl becomes even slightly smaller in some cases (compound A4/2). This suggests that the pentagonal shape remains, but the pentagonal cylinders become rotationally disordered.
  • 72
    • 0035913725 scopus 로고    scopus 로고
    • There is only one report about a pentagonal net in solid crystal structure, but in this case the net deviates from planarity (wavelike deformation) in order to allow for periodic tiling by identical pentagons: Moulton, B.; Lu, J.-J.; Zaworotko, M. J. J. Am. Chem. Soc. 2001, 123, 9224-9225.
    • (2001) J. Am. Chem. Soc. , vol.123 , pp. 9224-9225
    • Moulton, B.1    Lu, J.-J.2    Zaworotko, M.J.3
  • 79
    • 28444445872 scopus 로고    scopus 로고
    • note
    • Due to the confinement by the columns, which penetrate the nematic continuum perpendicular to the nematic director, the director field follows the curvature, and therefore, there is no uniform director in the plane perpendicular to the columns; orientational order is only maintained parallel to the columns. In contrast, there is no disturbance of the nematic director if the columns penetrate the nematic continuum parallel to the long axis of the rods.
  • 100
    • 0028062883 scopus 로고
    • Examples of supramolecular hexagons, hexagonal cylinders, and hexagonal grids: (a) Venkataraman, D.; Lee, S.; Zhang, J.; Moore, J. S. Nature 1994, 371, 591-593.
    • (1994) Nature , vol.371 , pp. 591-593
    • Venkataraman, D.1    Lee, S.2    Zhang, J.3    Moore, J.S.4
  • 110
    • 0035384248 scopus 로고    scopus 로고
    • Reviews about coordination polymers: (a) Moulton, B.; Zaworotko, M. J. Chem. Rev., 2001, 101, 1629-1658.
    • (2001) Chem. Rev. , vol.101 , pp. 1629-1658
    • Moulton, B.1    Zaworotko, M.J.2


* 이 정보는 Elsevier사의 SCOPUS DB에서 KISTI가 분석하여 추출한 것입니다.