Angewandte
Chemie
Spiering, R. A. J. Janssen, E. W. Meijer, Synth. Met. 2000, 111,
0.46 nm of the polymer chains, whereas the low-intensity
anisotropic halo is assigned to the poorly ordered alkyl side
chains, which fills the periphery between the rigid conjugated
units. The meridional reflection corresponds to a period of
0.76 nm and therefore to every second monomer unit along
the polymer backbone being in an identical arrangement, as
illustrated in Figure 5b.
The organization of the polymer changed slightly above
the phase transition of 1328C (see the Supporting Informa-
tion). The shape and intensity of the equatorial reflections
were unchanged, but the reflections were shifted to lower
angles indicating smaller lateral distances of 3.15 nm at the
higher-temperature phase. Such a decrease in distance
between rigid, well-packed polymer chains might be
explained by the melting of the alkyl substituents. Indeed,
the diffuse anisotropic halo is characteristic for the melting of
the alkyl side chains. The change of the side-chain dynamics
does not affect the correlations between the repeat units
along the polymer chain, but does lead to an increase of their
steric demand and thus to a hindrance of the polymer
stacking. This change is reflected by the lowered intensity of
the reflection corresponding to the stacking distance; the full
intensity was recovered upon cooling the sample back to
308C.
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In conclusion, the new, electron-rich, electroactive soluble
polymer
with
a
regiosymmetric
structure
poly-
[PheDOT-(C12)2] was synthesized by chemical polymeri-
zation. The polymer possesses a high degree of intra- and
interchain order, both in solution and the solid state. At high
temperature in ODCB or xylenes, the polymer possesses a
planar conformation, which leads to aggregation at low
temperature. Spin-coating from a hot ODCB leads to the
formation of nanoribbons. Structural investigation by 2D-
WAXS of mechanically aligned filaments revealed a pro-
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correlations along the polymer backbone and between the
polymer chains were observed. Because the order of con-
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requirement for charge-carrier transport, and thus for their
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Keywords: conducting materials · pi interactions · polymers ·
self-assembly · thermochromism
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