2018
DOI: 10.1002/pssb.201800349
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Surface Mediated Synthesis of 2D Covalent Organic Networks: 1,3,5‐Tris(4‐bromophenyl)benzene on Au(111)

Abstract: Covalent organic networks derived from surface-mediated self-assembly of 1,3,5-tris(4-bromophenyl)benzene into two-dimensional networks on Au(111) have been studied by scanning tunneling microscopy (STM) and by X-ray spectroscopic methods. High resolution soft X-ray photoemission spectroscopy (SXPS) using synchrotron radiation have been used to study the formation of the 1,3,5-tris(4-bromophenyl)benzene-derived 2D networks by observing temperature-dependent C 1s and Br 3d core level XPS spectra. X-ray absorpti… Show more

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Cited by 11 publications
(22 citation statements)
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“…38 A minor Br 3d doublet with Br 3d 5/2 (green) shifted about 1.6 eV toward low BE is required to achieve better peak deconvolution (see also Figure 2b) and ascribed to surface-bound Br atoms. 40,41 The latter corresponds to about 3% of the entire Br 3d signal. Accordingly, almost all adsorbed molecules are intact, which is expected due to the low Au( 111 S1b).…”
Section: ■ Results and Discussionmentioning
confidence: 99%
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“…38 A minor Br 3d doublet with Br 3d 5/2 (green) shifted about 1.6 eV toward low BE is required to achieve better peak deconvolution (see also Figure 2b) and ascribed to surface-bound Br atoms. 40,41 The latter corresponds to about 3% of the entire Br 3d signal. Accordingly, almost all adsorbed molecules are intact, which is expected due to the low Au( 111 S1b).…”
Section: ■ Results and Discussionmentioning
confidence: 99%
“…The component at 284.9 eV is attributed to the C atoms linked to the Br atoms (C–Br). , On the other hand, the Br 3d spectrum (Figure f) is dominated by a Br 3d doublet with Br 3d 5/2 centered at 69.7 eV (blue) and attributed to the Br–C bonds . A minor Br 3d doublet with Br 3d 5/2 (green) shifted about 1.6 eV toward low BE is required to achieve better peak deconvolution (see also Figure b) and ascribed to surface-bound Br atoms. , The latter corresponds to about 3% of the entire Br 3d signal. Accordingly, almost all adsorbed molecules are intact, which is expected due to the low Au(111) surface reactivity.…”
Section: Resultsmentioning
confidence: 99%
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“…Notably, slight basic conditions (i.e., the addition of triethylamine or N,N-diisopropylethylamine) can significantly enhance the reaction rate without sacrificing the quality of the as-prepare films. However, few positive results can be obtained from chlorine- and fluorine-substituted aromatic compounds probably due to the higher bond energy of Ar–Cl and Ar–F. ,, After polymerization, all films were characterized by various spectra and exhibited finger peaks: PPP­(Br) (FTIR: ∼ 820 cm –1 ; Raman: 1001, 1289, and 1607 cm –1 ), , poly­(1,4-nanphthalene) (1,4-PN) (FTIR: 842 and 774 cm –1 ), , poly­(1,5-naphthalene) (1,5-PN) (FTIR: 795 and 775 cm –1 ); poly­(9,10-anthracene) (9,10-PA) (FTIR: 746 and disappearance of 880 cm –1 ), , poly­(2,6-anthracene) (2,6-PA) (FTIR: 885 and 802 cm –1 ), poly­(2,7-phenanthrene) (2,7-PPA) (FTIR: 888, 810, and 740 cm –1 ), , poly­(2,7-pyrene) (2,7-PPy) (FTIR: 879 and 818 cm –1 ), 1,3,5-polybenzene (PTBB) (FTIR: ∼887, 756, and 698 cm –1 ; Raman: 1001, 1300, and 1602 cm –1 ), and poly­(1,3,5-triphenylbenzene) (PTBPB) (FTIR: 881 and 820 cm –1 ; Raman: 1001, 1346, and 1608 cm –1 ) . Also, the UV–vis absorption of all films has been conducted as shown in Figure : the maximum absorptions are located at 328 nm for PPP­(Br), 355 nm for 1,4-PN, 320 nm for 1,5-PN, 391 nm for 9,10-PA, 296 nm for 2,6-PA, 330 nm for 2,7-PPA, 385 nm for 2,7-PPy, 293 nm for PTBB, and 322 nm for PTBPB film, respectively.…”
Section: Resultsmentioning
confidence: 99%
“…The construction of various conjugated polymers under neutral and mild conditions has attracted many scientists’ attention because these materials have diverse applications in optoelectrical devices. Various synthetic methods, such as the Ullmann reaction, Suzuki reaction, free-radical polymerization, metallic/organometallic catalysis, on-surface polymerization, mechanochemical polymerization, electrochemically assistant polymerization, etc., have been employed to prepare various conjugated polymers. Among them, employing electrons as catalysts to construct diverse conjugated polymers under mild and neutral conditions did not receive much attention. However, this method is very important to fabricate large-area thin films as well as to construct multilayer heterostructures for broad applications. To date, the catalytic ability of electrons under neutral conditions for the simultaneous synthesis and film fabrication of conjugated polymers is rarely investigated.…”
Section: Introductionmentioning
confidence: 99%