Journal of the American Chemical Society
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AUTHOR INFORMATION
Corresponding Authors
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The authors declare no competing financial interest.
ACKNOWLEDGMENTS
We gratefully acknowledge the MALDI-MS analysis of 1 per-
formed by Bruker, Bremen. Financial Support by the Fonds der
Chemischen Industrie and the DFG (SFB 624) is gratefully
acknowledged.
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Figure 2. STM images and (supra-)molecular models of 1 (a, b)
and 9 (c) at the OA/HOPG interface. (a) Overview STM image of
1 that forms a hexagonal pattern to which a unit cell of a = b =
(10.8 ± 0.2) nm, = (60 ± 2)° is indexed (33.0 33.0 nm2; VS = –
0.6 V, It = 17 pA, c = 3 10-7 M). (b) High-resolution STM image
of one molecule of 1 (15.3 15.3 nm2; VS = –0.6 V, It = 17 pA, c
= 3 10-7 M). (c) STM image of 9 (30 30 nm2 (internal scanner
calibration); VS = –0.8 V, It = 5 pA, c = 3 10-7 M). The white
asterisks indicate the HOPG main axes directions. Throughout all
models, the alkyl chains are partly omitted for clarity.
In summary, we expanded our modular synthetic strategy
towards molecular spoked wheel structures by using polymer
homologue phenylene-ethynylene-butadienylene oligomers as
building blocks to synthesize a rigid disc-like defined structure
with a diameter of about 12 nm. Since the higher elements of
these oligomer series are readily available, processable homo-
logues with sizes well above ten nanometer should be accessi-
ble. In addition, the importance and informative value of mi-
croscopic techniques for the characterization of nanoscale
compounds is highlighted.
ASSOCIATED CONTENT
Supporting Information
(15) Lazzaroni, R.; Calderone, A.; Brédas, J. L.; Rabe, J. P. J.
Chem. Phys. 1997, 107, 99.
Additional STM images, detailed synthesis and characterization
of all compounds. This material is available free of charge via the
ACS Paragon Plus Environment