Journal
ACS NANO
Volume 7, Issue 4, Pages 3014-3021Publisher
AMER CHEMICAL SOC
DOI: 10.1021/nn400337v
Keywords
polymerization; liquid-solid; homolysis; halogenated monomer; STM; XPS; Au(111)
Categories
Funding
- UK Engineering and Physical Sciences Research Council
- Hanns-Seidel-Stiftung
- Kurt Fordan Forderverein fur herausragende Begabung e.V.
- DFG [LA1842/4]
- Nanosystems-Initiative-Munich (NIM)
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The polymerization of 1,3,5-tri(4-iodophenyI)benzene (TIPB) on Au(111) through covalent aryl-aryl coupling is accomplished using a solution-based approach and investigated by scanning tunneling microscopy. Drop-casting of the TIPB monomer onto Au(111) at room temperature results in poorly ordered noncovalent arrangements of molecules and partial dehalogenation. However, drop-casting on a preheated Au(111) substrate yields various topologically distinct covalent aggregates and networks. Interestingly, some of these covalent nanostructures do not adsorb directly on the Au(111) surface, but are loosely bound to a disordered layer of a mixture of chemisorbed iodine and molecules, a conclusion that is drawn from STM data and supported by X-ray photoelectron spectroscopy. We argue that the gold surface becomes covered by a strongly chemisorbed iodine monolayer which eventually Inhibits further polymerization.
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