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| - α-Helical-within-Discotic Columnar Structures of a Complexbetween Poly(ethylene oxide)-block-poly(l-lysine) and aHexa-peri-hexabenzocoronene
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| - Poly(ethylene oxide)-block-poly(l-lysine) (PEO−PLL) was complexed with an amphiphilic hexa-peri-hexabenzocoronene (HBC). This produced a thermotropic liquid crystalline material (PEO−PLL−HBC),which was investigated by FTIR spectroscopy and differential scanning calorimetry as well as by wide-and small-angle X-ray scattering. It was found that the poly(l-lysine) blocks form an α-helical secondarystructure. Each helix is surrounded symmetrically by six discotic columns of HBC, which gives an α-helical-within-discotic column structural entity. The dense packing of these entities produces hexagonal sublattices(formed by the columns) in the frame of a two-dimensional hexagonal lattice (formed by the helices). Anorder−order transition from a columnar structure Col1 to Col2 was found at 54 °C. The unit cell constantsare 5.75 nm (Col1) and 6.60 nm (Col2). The larger unit cell size of Col2 was explained by a higherintracolumnar order of the latter in which the packing distance of the disklike HBC cores is well-defined(0.353 nm). PEO−PLL−HBC combines essential features of liquid crystals with a basic structural elementof proteins into a single material.
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