scholarly journals Monolayer and Bilayer Formation of Molecular 2D Networks Assembled at the Liquid/Solid Interfaces by Solution-Based Drop-Cast Method

Molecules ◽  
2021 ◽  
Vol 26 (24) ◽  
pp. 7707
Author(s):  
Xingming Zeng ◽  
Yi Hu ◽  
Rongbin Xie ◽  
Sadaf Bashir Khan ◽  
Shern-Long Lee
Keyword(s):  
Organic Solvent ◽  
Organic Molecules ◽  
Two Dimensions ◽  
Three Dimensions ◽  
Scanning Tunneling ◽  
Tetracarboxylic Acid ◽  
Tunneling Microscopy ◽  
Simple Route ◽  
Trimesic Acid ◽  
Facile Preparation

In recent years, extending self-assembled structures from two-dimensions (2D) to three-dimensions (3D) has been a paradigm in surface supramolecular chemistry and contemporary nanotechnology. Using organic molecules of p-terphenyl-3,5,3′,5′-tetracarboxylic acid (TPTC), and scanning tunneling microscopy (STM), we present a simple route, that is the control of the solute solubility in a sample solution, to achieve the vertical growth of supramolecular self-assemblies, which would otherwise form monolayers at the organic solvent/graphite interface. Presumably, the bilayer formations were based on π-conjugated overlapped molecular dimers that worked as nuclei to induce the yielding of the second layer. We also tested other molecules, including trimesic acid (TMA) and 1,3,5-tris(4-carboxyphenyl)-benzene (BTB), as well as the further application of our methodology, demonstrating the facile preparation of layered assemblies.

scholarly journals Describing chain-like assembly of ethoxygroup-functionalized organic molecules on Au(111) using high-throughput simulations

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Lokamani ◽  
Jeffrey Kelling ◽  
Robin Ohmann ◽  
Jörg Meyer ◽  
Tim Kühne ◽  
...  
Keyword(s):  
High Throughput ◽  
Energy Function ◽  
Organic Molecules ◽  
Molecular Wires ◽  
Scanning Tunneling ◽  
Tunneling Microscopy ◽  
Intermolecular Interaction Energy ◽  
One Dimensional ◽  
Coverage Density ◽  
Clustering Approach

AbstractDue to the low corrugation of the Au(111) surface, 1,4-bis(phenylethynyl)-2,5-bis(ethoxy)benzene (PEEB) molecules can form quasi interlocked lateral patterns, which are observed in scanning tunneling microscopy experiments at low temperatures. We demonstrate a multi-dimensional clustering approach to quantify the anisotropic pair-wise interaction of molecules and explain these patterns. We perform high-throughput calculations to evaluate an energy function, which incorporates the adsorption energy of single PEEB molecules on the metal surface and the intermolecular interaction energy of a pair of PEEB molecules. The analysis of the energy function reveals, that, depending on coverage density, specific types of pattern are preferred which can potentially be exploited to form one-dimensional molecular wires on Au(111).

Mining Predicted Crystal Structure Landscapes with High Throughput Crystallization: Old Molecules, New Insights

2019 ◽  
Author(s):  
Peng Cui ◽  
David P. McMahon ◽  
Peter Spackman ◽  
Ben M. Alston ◽  
Marc A. Little ◽  
...  
Keyword(s):  
Crystal Structure ◽  
High Throughput ◽  
Structure Prediction ◽  
Organic Molecules ◽  
Screening Method ◽  
Molecular Crystals ◽  
Crystal Structure Prediction ◽  
Tetracarboxylic Acid ◽  
Trimesic Acid ◽  
Interconnected Pores

<a></a><a>Organic molecules tend to close pack to form dense structures when they are crystallized from organic solvents. Porous molecular crystals defy this rule: they typically crystallize with lattice solvent in the interconnected pores. However, the design and discovery of such structures is often challenging and time consuming, in part because it is difficult to predict solvent effects on crystallization. Here, we combine crystal structure prediction (CSP) with a high-throughput crystallization screening method to accelerate the discovery of stable hydrogen-bonded frameworks. We exemplify this strategy by finding new phases of two well-studied molecules in a computationally targeted way. Specifically, we find a new porous polymorph of trimesic acid, δ-<b>TMA</b>, that has a guest free hexagonal pore structure, as well as three new solvent-stabilized diamondoid frameworks</a> of adamantane-1,3,5,7-tetracarboxylic acid (<b>ADTA</b>).

Supramolecular Chemistry at the Liquid/Solid Interface a Scanning Tunneling Microscopy Approach

2007 ◽  
Vol 121-123 ◽  
pp. 369-372
Author(s):  
S. de Feyter ◽  
A. Miura ◽  
H. Uji-i ◽  
P. Jonkheijm ◽  
A.P.H.J. Schenning ◽  
...  
Keyword(s):  
Hydrogen Bonding ◽  
Scanning Tunneling Microscopy ◽  
Supramolecular Chemistry ◽  
Organic Molecules ◽  
Molecular Conformation ◽  
Scanning Tunneling ◽  
Conjugated Oligomers ◽  
Two Dimensional ◽  
Tunneling Microscopy ◽  
Solid Interface

With scanning tunneling microscopy (STM), the intramolecular conformational and intermolecular ordering aspects have been investigated of a variety of organic molecules physisorbed at the liquid-solid interface. By balancing the interplay between intramolecular and intermolecular interactions (hydrogen bonding), leading to control of the molecular conformation, foldamers were created which order into well-defined two-dimensional crystals. The nature of the hydrogen bonding groups in conjugated oligomers leads to the formation of infinite stacks and cyclic multimers, expressing the chiral nature of the molecules.

LOCAL SPECTROSCOPY OF ELECTRONS CONFINED IN LESS THAN TWO DIMENSIONS

1997 ◽  
Vol 04 (02) ◽  
pp. 381-390
Author(s):  
A. L. VÁZQUEZ DE PARGA
Keyword(s):  
Size Effects ◽  
Electron Gas ◽  
Two Dimensions ◽  
Scanning Tunneling ◽  
Nanometer Scale ◽  
Quantum Size Effects ◽  
Tunneling Microscopy ◽  
Electron Confinement ◽  
Quantum Size ◽  
Unique Ability

Scanning tunneling microscopy provides new ways of studying electron confinement and quantum size effects. In this paper we will summarize the results obtained in the study of the interaction between a 2D electron gas and different structures, some of them natural and others artificially constructed using another unique ability of STM: modify and manipulate materials at the atomic and the nanometer scale.

HYDROGEN-BONDED STRUCTURES OF TRIMESIC AND MELAMINE ON HIGHLY ORIENTED PYROLYTIC GRAPHITE

2014 ◽  
Vol 21 (03) ◽  
pp. 1450035 ◽  
Author(s):  
LING ZHU ◽  
XUMING XU ◽  
YAN WANG ◽  
SHUYI LIU ◽  
JIE LING ◽  
...  
Keyword(s):  
Scanning Tunneling Microscopy ◽  
Functional Groups ◽  
Guest Molecule ◽  
Pyrolytic Graphite ◽  
Building Blocks ◽  
Scanning Tunneling ◽  
Porous Structures ◽  
Highly Oriented Pyrolytic Graphite ◽  
Tunneling Microscopy ◽  
Trimesic Acid

The assembled structures of triangular symmetrically shape molecules with three functional groups, trimesic acid (TMA) and melamine, have been investigated by scanning tunneling microscopy on Highly Oriented Pyrolytic Graphite (HOPG) in ambient. Hexagonal porous structures are formed by these molecules and the cavity of the assembled structure becomes bigger when larger molecules are used as building blocks. The cavity within the assembled structure formed by TMA is bigger enough to host guest molecule.

scholarly journals Ester formation at the liquid–solid interface

2017 ◽  
Vol 8 ◽  
pp. 2139-2150 ◽  
Author(s):  
Nguyen T. N. Ha ◽  
Thiruvancheril G Gopakumar ◽  
Nguyen D. C. Yen ◽  
Carola Mende ◽  
Lars Smykalla ◽  
...  
Keyword(s):  
Deposition Temperature ◽  
Pyrolytic Graphite ◽  
Alcoholic Solution ◽  
Scanning Tunneling ◽  
Tunneling Microscopy ◽  
Regular Array ◽  
Trimesic Acid ◽  
Solid Interface ◽  
Ester Formation ◽  
Adsorbate Layer

A chemical reaction (esterification) within a molecular monolayer at the liquid–solid interface without any catalyst was studied using ambient scanning tunneling microscopy. The monolayer consisted of a regular array of two species, an organic acid (trimesic acid) and an alcohol (undecan-1-ol or decan-1-ol), coadsorbed out of a solution of the acid within the alcohol at the interface of highly oriented pyrolytic graphite (HOPG) (0001) substrate. The monoester was observed promptly after reaching a threshold either related to the increased packing density of the adsorbate layer (which can be controlled by the concentration of the trimesic acid within the alcoholic solution via sonication or extended stirring) or by reaching a threshold with regards to the deposition temperature. Evidence that esterification takes place directly at the liquid–solid interface was strongly supported.

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