Influence of flexible spacers on liquid-crystalline self-assembly of T-shaped bolaamphiphiles

Journal of the American Chemical Society

Volumn 133, Issue 20, 2011, Pages 7872-7881

  Cheng, Xiaohong ^a,b   Liu, Feng ^c   Zeng, Xiangbing ^c   Ungar, Goran ^c,d   Kain, Jens ^b   Diele, Siegmar ^b   Prehm, Marko ^b   Tschierske, Carsten ^b  

^a YUNNAN UNIVERSITY   (China)

^b MARTIN LUTHER UNIVERSITY HALLE WITTENBERG   (Germany)

^c UNIVERSITY OF SHEFFIELD   (United Kingdom)

^d Seoul National University   (South Korea)

Author keywords

[No Author keywords available]

Indexed keywords

2D LATTICE; ALKYL SPACERS; BOLAAMPHIPHILES; COLUMNAR PHASIS; ELECTRON DENSITY MAPS; FLEXIBLE SPACER; LATERAL CHAINS; LIQUID-CRYSTALLINE; LIQUID-CRYSTALLINE PHASIS; PHASE TRANSITION TEMPERATURES; POLAR GROUPS; POLARIZING MICROSCOPY; RIGID CORE; SECOND-ORDER PHASE TRANSITION; SIDE LENGTH; SIDE-CHAINS; SPACER LENGTHS; SQUARE CROSS SECTION; SQUARE CYLINDERS; TEMPERATURE DEPENDENT; TERMINAL POSITION;

CRYSTALLINE MATERIALS; CYLINDERS (SHAPES); HONEYCOMB STRUCTURES; HYDROGEN BONDS; PHASE TRANSITIONS; SELF ASSEMBLY;

LIQUIDS;

ALKYL GROUP; AMPHOPHILE; BIPHENYL; HYDROGEN;

ARTICLE; CHEMICAL STRUCTURE; CRYSTALLIZATION; DENSITY; ELECTRON; HYDROGEN BOND; LIQUID CRYSTAL; PHASE TRANSITION; POLARIZATION MICROSCOPY; SYNTHESIS; TEMPERATURE DEPENDENCE; THERMODYNAMICS; THERMOSTABILITY; TRANSITION TEMPERATURE; X RAY CRYSTALLOGRAPHY;

CRYSTALLIZATION; MOLECULAR STRUCTURE; X-RAY DIFFRACTION;

EID: 79957701104     PISSN: 00027863     EISSN: 15205126     Source Type: Journal    
DOI: 10.1021/ja200822z     Document Type: Article

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68. The value h = 0.45 nm was used in all calculations, independent of the actual position of the maximum of the wide angle scattering in the diffraction pattern. The reason is that the bolaamphiphilic units (their average diameter is 0.45 nm) are responsible for the lattice of the cylinder shells, whereas the semiperfluoralkyl chains only fill the channels within this structure. Because the cross section of the perfluorinated segments is larger than the rest of the molecules, there is a drift of the maximum of the diffuse scattering in the X-ray diffraction pattern to larger d -values with increasing degree of fluorination. However, this shift is due to a change of a molecular parameter rather than due to a change of the structure. Because the diameter of the fluorinated segments is larger than that of the nonfluorinated bolaamphiphilic moieties, which form the cylinder walls, there is a mixing of the chains of adjacent (hypothetical) unit cells along the cylinders, i.e. the perfluorinated chains in one (hypothetical) unit cell also contribute to the space filling in the adjacent unit cell.
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