scholarly journals Mono- and multilayers of molecular spoked carbazole wheels on graphite

2014 ◽  
Vol 10 ◽  
pp. 2783-2788 ◽  
Author(s):  
Stefan-S Jester ◽  
A Vikas Aggarwal ◽  
Daniel Kalle ◽  
Sigurd Höger
Keyword(s):  
Octanoic Acid ◽  
Pyrolytic Graphite ◽  
Self Assembled Monolayers ◽  
Scanning Tunneling ◽  
Tunneling Microscopy ◽  
Chemical Structures ◽  
Rigid Objects ◽  
Assembled Monolayers ◽  
Stm Images ◽  
Insight Into

Self-assembled monolayers of a molecular spoked wheel (a shape-persistent macrocycle with an intraannular spoke/hub system) and its synthetic precursor are investigated by scanning tunneling microscopy (STM) at the liquid/solid interface of 1-octanoic acid and highly oriented pyrolytic graphite. The submolecularly resolved STM images reveal that the molecules indeed behave as more or less rigid objects of certain sizes and shapes – depending on their chemical structures. In addition, the images provide insight into the multilayer growth of the molecular spoked wheels (MSWs), where the first adlayer acts as a template for the commensurate adsorption of molecules in the second layer.

scholarly journals Self-assembled monolayers of shape-persistent macrocycles on graphite: interior design and conformational polymorphism

2014 ◽  
Vol 10 ◽  
pp. 2774-2782 ◽  
Author(s):  
Joscha Vollmeyer ◽  
Friederike Eberhagen ◽  
Sigurd Höger ◽  
Stefan-S Jester
Keyword(s):  
Interior Design ◽  
Pyrolytic Graphite ◽  
Self Assembled Monolayers ◽  
Scanning Tunneling ◽  
Tunneling Microscopy ◽  
Conformational Polymorphism ◽  
Assembled Monolayers ◽  
Self Assembled ◽  
Solid Liquid Interface ◽  
Solid Liquid

Three shape-persistent naphthylene–phenylene–acetylene macrocycles of identical backbone structures and extraannular substitution patterns but different (empty, apolar, polar) nanopore fillings are self-assembled at the solid/liquid interface of highly oriented pyrolytic graphite and 1,2,4-trichlorobenzene. Submolecularly resolved images of the resulting two-dimensional (2D) crystalline monolayer patterns are obtained by in situ scanning tunneling microscopy. A concentration-dependent conformational polymorphism is found, and open and more dense packing motifs are observed. For all three compounds alike lattice parameters are found, therefore the intermolecular macrocycle distances are mainly determined by their size and symmetry. This is an excellent example that the graphite acts as a template for the macrocycle organization independent from their specific interior.

scholarly journals Syntheses and properties of thienyl-substituted dithienophenazines

2010 ◽  
Vol 6 ◽  
pp. 1180-1187 ◽  
Author(s):  
Annemarie Meyer ◽  
Eva Sigmund ◽  
Friedhelm Luppertz ◽  
Gregor Schnakenburg ◽  
Immanuel Gadaczek ◽  
...  
Keyword(s):  
Density Functional ◽  
Pyrolytic Graphite ◽  
Electron Donors ◽  
Time Dependent ◽  
Self Assembled Monolayers ◽  
Scanning Tunneling ◽  
Tunneling Microscopy ◽  
Functional Theory ◽  
Highly Ordered Pyrolytic Graphite ◽  
Assembled Monolayers

A series of dithienophenazines with different lengths of the oligomeric thiophene units (quaterthiophenes and sexithiophenes) was synthesized. The thiophene and phenazine units act as electron donors and acceptors, respectively, resulting in characteristic absorption spectra. The optical spectra were calculated using time-dependent density functional theory at the B3LYP/TZVP level and verify the experimental data. Adsorption of the dithienophenazines on highly ordered pyrolytic graphite (HOPG) was investigated by scanning tunneling microscopy, showing that one of the compounds forms highly organized self-assembled monolayers.

Specific Immobilization of Streptavidin on Mixed Self-Assembled Monolayers as Mixing Ratio

2007 ◽  
Vol 121-123 ◽  
pp. 495-498 ◽  
Author(s):  
Jun Hyung Park ◽  
Buyng Su Park ◽  
Gu Huh ◽  
Seung Hyun Lee ◽  
Hyun Sook Lee ◽  
...  
Keyword(s):  
Colorimetric Detection ◽  
Gold Surface ◽  
Self Assembled Monolayers ◽  
Scanning Tunneling ◽  
Local Domain ◽  
Mixing Ratio ◽  
Tunneling Microscopy ◽  
Self Assembled Monolayer ◽  
Assembled Monolayers ◽  
Self Assembled

We report on the distribution of mixed self-assembled monolayers (SAMs) composed of biotinylated and diluent alkylthiolates for streptavidin immobilization. Two thiol derivatives, 11-mercapto-1-undecanol (MUOH) and 11-mercaptoundecanoic-(8-biotinylamido-3,6-dioxaoctyl) amide (MBDA), were employed for mixed SAM. These thiols formed self-assembled monolayer without local domain, and streptavidins were immobilized onto biotinylated gold surface without nonspecific binding. In order to find the optimized condition of immobilization of streptavidin, we controlled the mixing ratio of two kind thiols by colorimetric detection assay, and the immobilization was characterized by atomic force microscopy (AFM), scanning tunneling microscopy (STM), and ellipsometer.

Scanning Tunneling Microscopy of Template-Stripped Au Surfaces and Highly Ordered Self-Assembled Monolayers

Langmuir ◽  
2008 ◽  
Vol 24 (12) ◽  
pp. 5984-5987 ◽  
Author(s):  
Sangyeob Lee ◽  
Sung-Soo Bae ◽  
Gilberto Medeiros-Ribeiro ◽  
Jason J. Blackstock ◽  
Sehun Kim ◽  
...  
Keyword(s):  
Scanning Tunneling Microscopy ◽  
Self Assembled Monolayers ◽  
Scanning Tunneling ◽  
Tunneling Microscopy ◽  
Assembled Monolayers ◽  
Self Assembled

scholarly journals Transfer of chiral information from a chiral solvent to a two-dimensional network

2017 ◽  
Vol 204 ◽  
pp. 215-231 ◽  
Author(s):  
Iris Destoop ◽  
Andrea Minoia ◽  
Oleksandr Ivasenko ◽  
Aya Noguchi ◽  
Kazukuni Tahara ◽  
...  
Keyword(s):  
Self Assembled Monolayers ◽  
Scanning Tunneling ◽  
Tunneling Microscopy ◽  
Chiral Induction ◽  
Dimensional Network ◽  
Assembled Monolayers ◽  
Self Assembled ◽  
The Impact ◽  
Atomically Flat ◽  
Origin Of Homochirality

Chiral induction in self-assembled monolayers has garnered considerable attention in the recent past, not only due to its importance in chiral resolution and enantioselective heterogeneous catalysis but also because of its relevance to the origin of homochirality in life. Here, we demonstrate the emergence of homochirality in a supramolecular low-density network formed by achiral molecules at the interface of a chiral solvent and an atomically-flat achiral substrate. We focus on the impact of structure and functionality of the adsorbate and the chiral solvent on the chiral induction efficiency in self-assembled physisorbed monolayers, as revealed by scanning tunneling microscopy. Different induction mechanisms are proposed and evaluated, with the assistance of advanced molecular modeling simulations.

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