scholarly journals Solvent-Dependent Self-Assembly of 4,7-Dibromo-5,6-bis(octyloxy)benzo[c][1,2,5] Thiadiazole on Graphite Surface by Scanning Tunneling Microscopy

2013 ◽  
Vol 2013 ◽  
pp. 1-7 ◽  
Author(s):  
Bao Zha ◽  
Xinrui Miao ◽  
Yijing Li ◽  
Pei Liu ◽  
Kai Miao ◽  
...  
Keyword(s):  
Scanning Tunneling Microscopy ◽  
Self Assembly ◽  
Lamellar Structure ◽  
Octanoic Acid ◽  
Linear Structure ◽  
Halogen Bonding ◽  
The Self ◽  
Scanning Tunneling ◽  
Tunneling Microscopy ◽  
Solvent Molecules

Solvent effect on self-assembly of 4,7-dibromo-5,6-bis(octyloxy)benzo[c][1,2,5] thiadiazole (DBT) on a highly oriented graphite (HOPG) surface was investigated by scanning tunneling microscopy (STM) by using 1-phenyloctane, 1-octanoic acid, and 1-octanol as the solvents. Two different patterns were obtained in 1-phenyloctane and 1-octanoic acid, suggesting that the self-assembly of DBT was solvent dependent. At the 1-phenyloctane/HOPG interface, a linear structure was revealed due to the intermolecular halogen bonding. When 1-octanoic acid and 1-octanol are used as the solvents, the coadsorption of solvent molecules resulting from the hydrogen bonding between DBT and solvent made an important contribution to the formation of a lamellar structure. The results demonstrate that solvents could affect the molecular self-assembly according to the variational intermolecular interactions.

scholarly journals Halogen Bonds Fabricate 2D Molecular Self-Assembled Nanostructures by Scanning Tunneling Microscopy

Crystals ◽  
2020 ◽  
Vol 10 (11) ◽  
pp. 1057
Author(s):  
Yi Wang ◽  
Xinrui Miao ◽  
Wenli Deng
Keyword(s):  
Scanning Tunneling Microscopy ◽  
Self Assembly ◽  
Density Functional ◽  
Deep Understanding ◽  
Halogen Bonding ◽  
The Self ◽  
Scanning Tunneling ◽  
Halogen Bonds ◽  
Tunneling Microscopy ◽  
Self Assembled

Halogen bonds are currently new noncovalent interactions due to their moderate strength and high directionality, which are widely investigated in crystal engineering. The study about supramolecular two-dimensional architectures on solid surfaces fabricated by halogen bonding has been performed recently. Scanning tunneling microscopy (STM) has the advantages of realizing in situ, real-time, and atomic-level characterization. Our group has carried out molecular self-assembly induced by halogen bonds at the liquid–solid interface for about ten years. In this review, we mainly describe the concept and history of halogen bonding and the progress in the self-assembly of halogen-based organic molecules at the liquid/graphite interface in our laboratory. Our focus is mainly on (1) the effect of position, number, and type of halogen substituent on the formation of nanostructures; (2) the competition and cooperation of the halogen bond and the hydrogen bond; (3) solution concentration and solvent effects on the molecular assembly; and (4) a deep understanding of the self-assembled mechanism by density functional theory (DFT) calculations.

Scanning Tunneling Microscopy Reveals Single-Molecule Insights into the Self-Assembly of Amyloid Fibrils

ACS Nano ◽  
2012 ◽  
Vol 6 (8) ◽  
pp. 6882-6889 ◽  
Author(s):  
Nataliya Kalashnyk ◽  
Jakob T. Nielsen ◽  
Erik H. Nielsen ◽  
Troels Skrydstrup ◽  
Daniel E. Otzen ◽  
...  
Keyword(s):  
Scanning Tunneling Microscopy ◽  
Single Molecule ◽  
Self Assembly ◽  
Amyloid Fibrils ◽  
The Self ◽  
Scanning Tunneling ◽  
Tunneling Microscopy

scholarly journals Potential Driven Non-Reactive Phase Transitions of Ordered Porphyrin Molecules on Iodine-Modified Au(100): An Electrochemical Scanning Tunneling Microscopy (EC-STM) Study

Surfaces ◽  
2018 ◽  
Vol 1 (1) ◽  
pp. 12-28 ◽  
Author(s):  
Tomasz Kosmala ◽  
Matías Blanco ◽  
Gaetano Granozzi ◽  
Klaus Wandelt
Keyword(s):  
Scanning Tunneling Microscopy ◽  
Long Range ◽  
Self Assembly ◽  
Electrostatic Interactions ◽  
The Self ◽  
Scanning Tunneling ◽  
Tunneling Microscopy ◽  
Electrode Potentials ◽  
Electrochemical Scanning Tunneling Microscopy

The modelling of long-range ordered nanostructures is still a major issue for the scientific community. In this work, the self-assembly of redox-active tetra(N-methyl-4-pyridyl)-porphyrin cations (H2TMPyP) on an iodine-modified Au(100) electrode surface has been studied by means of Cyclic Voltammetry (CV) and in-situ Electrochemical Scanning Tunneling Microscopy (EC-STM) with submolecular resolution. While the CV measurements enable conclusions about the charge state of the organic species, in particular, the potentio-dynamic in situ STM results provide new insights into the self-assembly phenomena at the solid-liquid interface. In this work, we concentrate on the regime of positive electrode potentials in which the adsorbed molecules are not reduced yet. In this potential regime, the spontaneous adsorption of the H2TMPyP molecules on the anion precovered surface yields the formation of up to five different potential-dependent long-range ordered porphyrin phases. Potentio-dynamic STM measurements, as a function of the applied electrode potential, show that the existing ordered phases are the result of a combination of van der Waals and electrostatic interactions.

Investigation of the non-covalent interactions of molecular self-assembly by scanning tunneling microscopy using the association of aromatic structures in pyrene-4,5,9,10-tetraone and phenanthrene-9,10-dione molecules

RSC Advances ◽  
2015 ◽  
Vol 5 (125) ◽  
pp. 103316-103320 ◽  
Author(s):  
Huiling Zhao ◽  
Shuai Zhang ◽  
Shuang Li ◽  
Xin Song ◽  
Wei Liu ◽  
...  
Keyword(s):  
Scanning Tunneling Microscopy ◽  
Self Assembly ◽  
The Self ◽  
Self Assembled Monolayers ◽  
Scanning Tunneling ◽  
Tunneling Microscopy ◽  
Aromatic Molecules ◽  
Assembled Monolayers ◽  
Non Covalent Interactions ◽  
Covalent Interactions

The self-assembled monolayers of aromatic molecules (pyrene-4,5,9,10-tetraone and phenanthrene-9,10-dione) were investigated at the liquid/solid (1-phenyloctane/graphite) interface using scanning tunneling microscopy, respectively.

Solvent Effects on the Self-Assembly of 1-Bromoeicosane on Graphite. Part I. Scanning Tunneling Microscopy

2009 ◽  
Vol 113 (9) ◽  
pp. 3631-3640 ◽  
Author(s):  
Gina M. Florio ◽  
Boaz Ilan ◽  
Thomas Müller ◽  
Thomas A. Baker ◽  
Adam Rothman ◽  
...  
Keyword(s):  
Scanning Tunneling Microscopy ◽  
Solvent Effects ◽  
Self Assembly ◽  
The Self ◽  
Scanning Tunneling ◽  
Tunneling Microscopy ◽  
Graphite Part

Adsorption of Pyrrole on the Si(111)-7×7 Surface: Effect of Substrate Temperature

2015 ◽  
Vol 1117 ◽  
pp. 35-38
Author(s):  
Masaru Shimomura ◽  
Keisuke Ota
Keyword(s):  
Substrate Temperature ◽  
Scanning Tunneling Microscopy ◽  
Self Assembly ◽  
Room Temperature ◽  
Surface Effect ◽  
Bond Cleavage ◽  
The Self ◽  
Scanning Tunneling ◽  
Tunneling Microscopy

Adsorption of pyrrole on the Si(111)-7×7 surface was investigated using scanning tunneling microscopy (STM). Template-induced molecular corral structure was observed at room temperature though the N-H bond cleavage. At the substrate temperature of 130 °C, the pyrrolyl adsorbates were observed by STM with reserving the 7×7 substrate. However, the self-assembly of the molecular corral structure was disarranged at 130 °C. Then, pyrrolyl group was decomposed or desorbed from the surface at the substrate temperature of 200 °C. The defect-induced attachment of pyrrole was also observed.

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