NDLI: Synthesis and electronic structure of a two dimensional π-conjugated polythiophene

Content Provider	Royal Society of Chemistry (RSC)
Author	Rosei, Federico Vondráček, Martin Fu, Chaoying Fagot-Revurat, Yannick Perepichka, Dmitrii F. Malterre, Daniel Lipton-Duffin, Josh Dinca, Laurentiu E. Cardenas, Luis Brusso, Jaclyn L. Gutzler, Rico
Copyright Year	2013
Abstract	We report the synthesis and first electronic characterization of an atomically thin two dimensional π-conjugated polymer. Polymerization via Ullmann coupling of a tetrabrominated tetrathienoanthracene on Ag(111) in ultra-high vacuum (UHV) produces a porous 2D polymer network that has been characterized by scanning tunnelling microscopy (STM). High-resolution X-ray photoelectron spectroscopy (HRXPS) shows that the reaction proceeds via two distinct steps: dehalogenation of the brominated precursor, which begins at room temperature (RT), and C–C coupling of the resulting Ag-bound intermediates, which requires annealing at 300 °C. The formation of the 2D conjugated network is accompanied by a shift of the occupied molecular states by 0.6 eV towards the Fermi level, as observed by UV photoelectron spectroscopy (UPS). A theoretical analysis of the electronic gap reduction in the transition from monomeric building blocks to various 1D and 2D oligomers and polymers yields important insight into the effect of topology on the electronic structure of 2D conjugated polymers.
Starting Page	3263
Ending Page	3268
Page Count	6
File Format	HTM / HTML PDF
ISSN	20416520
Volume Number	4
Issue Number	8
Journal	Chemical Science
DOI	10.1039/c3sc50800e
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Subscribed
Subject Keyword	Ubiquitin Ultra-high vacuum Electronvolt Polymer Ullmann Photoemission spectroscopy Topology Scanning tunneling microscope Fermi level Ullmann reaction Sacramento Regional Transit District Gap reduction X-ray photoelectron spectroscopy Nucleic acid thermodynamics
Content Type	Text
Resource Type	Article
Subject	Chemistry

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