scholarly journals Molecular assemblies on surfaces: towards physical and electronic decoupling of organic molecules

2021 ◽  
Vol 12 ◽  
pp. 950-956
Author(s):  
Sabine Maier ◽  
Meike Stöhr
Keyword(s):  
Organic Molecules ◽  
Molecular Assemblies

scholarly journals Influence of electrospray deposition on C60 molecular assemblies

2021 ◽  
Vol 12 ◽  
pp. 552-558
Author(s):  
Antoine Hinaut ◽  
Sebastian Scherb ◽  
Sara Freund ◽  
Zhao Liu ◽  
Thilo Glatzel ◽  
...  
Keyword(s):  
Organic Molecules ◽  
Thermal Evaporation ◽  
Molecular Level ◽  
High Vacuum ◽  
Good Alternative ◽  
Scanning Probe ◽  
Deposition Method ◽  
Electrospray Deposition ◽  
Molecular Assemblies ◽  
Oxide Substrates

Maintaining clean conditions for samples during all steps of preparation and investigation is important for scanning probe studies at the atomic or molecular level. For large or fragile organic molecules, where sublimation cannot be used, high-vacuum electrospray deposition is a good alternative. However, because this method requires the introduction into vacuum of the molecules from solution, clean conditions are more difficult to be maintained. Additionally, because the presence of solvent on the surface cannot be fully eliminated, one has to take care of its possible influence. Here, we compare the high-vacuum electrospray deposition method to thermal evaporation for the preparation of C60 on different surfaces and compare, for sub-monolayer coverages, the influence of the deposition method on the formation of molecular assemblies. Whereas the island location is the main difference for metal surfaces, we observe for alkali halide and metal oxide substrates that the high-vacuum electrospray method can yield single isolated molecules accompanied by surface modifications.

TERRACE INDUCED HOMOCHIRAL SELF-ASSEMBLY OF ZINC PHTHALOCYANINEON COPPER (111) SURFACE

2016 ◽  
Vol 23 (06) ◽  
pp. 1650047
Author(s):  
XIN SONG ◽  
HUIHUI KONG ◽  
LACHENG LIU ◽  
XIAOQING LIU ◽  
MINGDONG DONG ◽  
...  
Keyword(s):  
Self Assembly ◽  
Growth Process ◽  
Room Temperature ◽  
Organic Molecules ◽  
The Self ◽  
Step Edge ◽  
Suitable Method ◽  
Large Area ◽  
Molecular Assemblies ◽  
Lower Terrace

It is still a challenge to find a suitable method to fabricate a well-defined homochiral surface from achiral molecules, and one of the possible methods is to modify surfaces with organic molecular assemblies. Large-area chiral self-assembly nanostructures have been observed at room temperature by depositing ZnPc molecules on a Cu(111) surface. The growth process has been investigated. ZnPc molecules get adsorbed first at the terrace steps, and then extend over the lower terrace until the whole terrace is covered with ZnPc molecules; such growth process would be stopped when the self-assembly nanostructure run into a decorated upper terrace step edge. We found that the terrace steps with specific directions with respect to the close-packed directions of the substrate can induce homochiral self-assembly on the lower terraces. So we can propose a possible way to fabricate a well-defined homochiral surface from achiral organic molecules.

scholarly journals Hierarchical Construction of Versatile Diamondoid Porous Organic Salts (d-POS)

2014 ◽  
Vol 70 (a1) ◽  
pp. C983-C983
Author(s):  
Norimitsu Tohnai ◽  
Atsushi Yamamoto ◽  
Ichiro Hisaki ◽  
Mikiji Miyata
Keyword(s):  
Hydrogen Bonding ◽  
Sulfonic Acid ◽  
Organic Molecules ◽  
Gas Absorption ◽  
Porous Structures ◽  
Molecular Assemblies ◽  
Sulfonic Acids ◽  
Organic Salts ◽  
New Class ◽  
Hydrogen Bonding Networks

Porous materials using organic molecules have attracted much attention due to their potential application such as gas absorption and so on. However, it is still difficult to construct porous structures from only simple organic molecules. Thus, we proposed a novel hierarchical method to construct porous structures. In this method, the first step is to build up molecular assemblies. These assemblies act to sustain porous structures with larger inclusion spaces. Then, the assemblies are accumulated by intermolecular interactions between assemblies to achieve both robustness and dynamics of the porous structures. We have previously reported organic salts composed of triphenylmethylamine (TPMA) and various sulfonic acid derivatives constructed unique molecular assemblies "supramolecular clusters" through cubic hydrogen-bonding networks. Here we demonstrate that TPMA and sulfonic acids having polyaromatic moieties give a new class of porous structures consisting of diamond networks, named as diamondoid porous organic salts (d-POSs). The supramolecular clusters are hierarchically accumulated by π–π interactions between the polyaromatic moieties to yield the d-POSs through formation of the diamond networks. Large steric hindrance of the clusters prevents the diamond networks from constructing highly interpenetrated structures, giving continuous open channels. It should be noted that the interpenetration degree of the diamond networks is controlled by tuning the bulkiness of the cluster with alteration of sulfonic acids.

scholarly journals Surface-controlled reversal of the selectivity of halogen bonds

2020 ◽  
Vol 11 (1) ◽  
Author(s):  
Jalmar Tschakert ◽  
Qigang Zhong ◽  
Daniel Martin-Jimenez ◽  
Jaime Carracedo-Cosme ◽  
Carlos Romero-Muñiz ◽  
...  
Keyword(s):  
Gas Phase ◽  
Self Assembly ◽  
Organic Molecules ◽  
Halogen Bond ◽  
Control Parameters ◽  
Halogen Bonds ◽  
Molecular Assemblies ◽  
Molecular Charge ◽  
Different Types ◽  
Bond Strengths

Abstract Intermolecular halogen bonds are ideally suited for designing new molecular assemblies because of their strong directionality and the possibility of tuning the interactions by using different types of halogens or molecular moieties. Due to these unique properties of the halogen bonds, numerous areas of application have recently been identified and are still emerging. Here, we present an approach for controlling the 2D self-assembly process of organic molecules by adsorption to reactive vs. inert metal surfaces. Therewith, the order of halogen bond strengths that is known from gas phase or liquids can be reversed. Our approach relies on adjusting the molecular charge distribution, i.e., the σ-hole, by molecule-substrate interactions. The polarizability of the halogen and the reactiveness of the metal substrate are serving as control parameters. Our results establish the surface as a control knob for tuning molecular assemblies by reversing the selectivity of bonding sites, which is interesting for future applications.

scholarly journals A new design strategy for redox-active molecular assemblies with crystalline porous structures for lithium-ion batteries

2020 ◽  
Vol 11 (1) ◽  
pp. 37-43 ◽  
Author(s):  
Kensuke Nakashima ◽  
Takeshi Shimizu ◽  
Yoshinobu Kamakura ◽  
Akira Hinokimoto ◽  
Yasutaka Kitagawa ◽  
...  
Keyword(s):  
Porous Structure ◽  
Lithium Ion Batteries ◽  
High Performance ◽  
Organic Molecules ◽  
Lithium Ion ◽  
Design Strategy ◽  
Porous Structures ◽  
Molecular Assemblies ◽  
Active Materials ◽  
Redox Active

A new design strategy for the high-performance organic cathode-active materials of lithium-ion batteries is presented, which involves the assembly of redox-active organic molecules with a crystalline porous structure.

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