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Chiral‐Selective Formation of 1D Polymers Based on Ullmann‐Type Coupling: The Role of the Metallic Substrate
Author(s) -
Pham Tuan Anh,
Tran Bay V.,
Nguyen ManhThuong,
Stöhr Meike
Publication year - 2017
Publication title -
small
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.785
H-Index - 236
eISSN - 1613-6829
pISSN - 1613-6810
DOI - 10.1002/smll.201603675
Subject(s) - scanning tunneling microscope , polymer , materials science , molecule , annealing (glass) , dehydrogenation , covalent bond , metal , chirality (physics) , density functional theory , selectivity , graphene , chemical engineering , polymer chemistry , nanotechnology , chemistry , computational chemistry , organic chemistry , chiral symmetry , composite material , physics , quantum mechanics , quark , nambu–jona lasinio model , engineering , metallurgy , catalysis
The chiral‐selective formation of 1D polymers from a prochiral molecule, namely, 6,12‐dibromochrysene in dependence of the type of metal surface is demonstrated by a combined scanning tunneling microscopy and density functional theory study. Deposition of the chosen molecule on Au(111) held at room temperature leads to the formation of a 2D porous molecular network. Upon annealing at 200 °C, an achiral covalently linked polymer is formed on Au(111). On the other hand, a chiral Cu‐coordinated polymer is spontaneously formed upon deposition of the molecules on Cu(111) held at room temperature. Importantly, it is found that the chiral‐selectivity determines the possibility of obtaining graphene nanoribbons (GNRs). On Au(111), upon annealing at 350 °C or higher cyclo‐dehydrogenation occurs transforming the achiral polymer into a GNR. In contrast, the chiral coordination polymer on Cu(111) cannot be converted into a GNR.