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α-Helical-within-Discotic Columnar Structures of a Complex between Poly(ethylene oxide)-block-poly(L-lysine) and a Hexa- peri-hexabenzocoronene

MPS-Authors
http://pubman.mpdl.mpg.de/cone/persons/resource/persons48235

Kubowicz,  S.
MPI for Polymer Research, Max Planck Society;

http://pubman.mpdl.mpg.de/cone/persons/resource/persons48967

Watson,  Mark D.
MPI for Polymer Research, Max Planck Society;

http://pubman.mpdl.mpg.de/cone/persons/resource/persons48847

Tchebotareva,  N.
MPI for Polymer Research, Max Planck Society;

http://pubman.mpdl.mpg.de/cone/persons/resource/persons48459

Müllen,  Klaus
MPI for Polymer Research, Max Planck Society;

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Citation

Thünemann, A. F., Kubowicz, S., Burger, C., Watson, M. D., Tchebotareva, N., & Müllen, K. (2003). α-Helical-within-Discotic Columnar Structures of a Complex between Poly(ethylene oxide)-block-poly(L-lysine) and a Hexa- peri-hexabenzocoronene. Journal of the American Chemical Society, 125(2), 352-356.


Cite as: http://hdl.handle.net/11858/00-001M-0000-000F-62A9-D
Abstract
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 secondary structure. 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). An order-order transition from a columnar structure CoI1 to CoI2 was found at 54 degreesC. The unit cell constants are 5.75 nm (CoI1) and 6.60 nm (CoI2). The larger unit cell size Of CoI2 was explained by a higher intracolumnar 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 element of proteins into a single material.