Functionalized Truxenes: Adsorption and Diffusion of Single Molecules on the KBr(001) Surface

Such, Bartosz; Trevethan, Thomas; Glatzel, Thilo; Kawai, Shigeki; Zimmerli, Lars; Meyer, Ernst; Shluger, Alexander L.; Amijs, Catelijne H. M.; Mendoza, Paula de; Echavarren, Antonio M.

doi:10.1021/nn100424g

Cited by 59 publications

(76 citation statements)

References 65 publications

(81 reference statements)

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“…[9,10] Recent advances in experimental techniques have allowed the motion and interactions of single molecules to be studied with improved accuracy. Some of these techniques, such as atomic force microscopy, [11,12] total internal reflection fluorescence (TIRF) imaging, [13,14] and super-resolution imaging, [15][16][17] have allowed direct images to be produced which provide insight into the orientation, [18] clustering, or changes to a molecule within a system. Time-stop imaging techniques have also been used to determine the kinetic properties of a system.…”

Section: Introduction: Single Molecule Diffusionmentioning

confidence: 99%

Single Macromolecule Diffusion in Confined Environments

Mears

Tarmey

Geoghegan

2011

Macromol. Rapid Commun.

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ÐÐÐÐÐÐÐÐÐWe consider the behaviour of single molecules on surfaces and, more generally, in confined environments. These are loosely split into three sections: single molecules in biology, the physics of single molecules on surfaces, and controlled (directed) diffusion. With recent advances in single molecule detection techniques, the importance and mechanisms of single molecule processes such as localised enzyme production and intracellular diffusion across membranes has been highlighted, emphasising the extra information that cannot be obtained with techniques, which present average behaviour. Progress has also been made in producing artificial systems that can control the rate and direction of diffusion, and because these are still in their infancy (especially in comparison to complex biological systems), we discuss the new physics revealed by these phenomena. Introduction: single molecule diffusionThe motion of the very small has been studied for a long time, [1,2] beginning with the initial microscopic observations of pollen on water in 1827 and continuing in the present day with a vast array of molecular diffusion studies. Initially such studies concentrated on the average -2 -motion of an ensemble of molecules as techniques such as fluorescence recovery after photobleaching [3] (FRAP) were not sensitive enough to observe an individual particle. Despite this, averaging techniques have been, and continue to be, very successful in probing protein dynamics [4][5][6] and protein-protein interactions, [7,8] as well as determining average diffusion coefficients of molecules within a small region. [9,10] Recent advances in experimental techniques have allowed the motion and interactions of single molecules to be studied with improved accuracy. Some of these techniques, such as atomic force microscopy, [11,12] total internal reflection fluorescence (TIRF) imaging, [13,14] and super-resolution imaging, [15][16][17] have allowed direct images to be produced which provide insight into the orientation, [18] clustering, or changes to a molecule within a system. Time-stop imaging techniques have also been used to determine the kinetic properties of a system. [19] However these are somewhat limited by the equipment in terms of exposure time, acquisition rate, and size of detection region. In general, imaging is useful as it provides visual confirmation of the region under study. We show in Figure 1 data exemplifying why single molecule imaging reveals more information than ensemble averaging techniques; here molecular motion is smeared out of the signal when the data are averaged (box 4 in Figure 1), but time-stop imaging reveals a complex molecular trajectory (box 3 in Figure 1).Techniques designed to examine the diffusive properties of molecules within a sample, such as neutron spin echo, [20][21][22] dynamic light scattering, [23,24] fluorescence correlation spectroscopy (FCS), [25][26][27][28] and single mode optical fibre detectors, [29] generally do not involve imaging in real space, but require spectroscopic determ...

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Section: Introduction: Single Molecule Diffusionmentioning

confidence: 99%

Single Macromolecule Diffusion in Confined Environments

Mears

Tarmey

Geoghegan

2011

Macromol. Rapid Commun.

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“…The cleaved bulk surfaces often exhibit large and atomically flat terraces bounded by monoatomic step edges. In particular, the geometry and potential variations near step edges play a main role in growth and etching of crystals [11,12], adsorption of molecules [13][14][15] and metallic nanoclusters [16], including the diffusion and pinning dynamics of adsorbates [17,18], and friction [19,20]. It is well known that atomic interaction increases due to the low coordination of the step ions [21], forming an Ehrlich-Schwoebel-like barrier [22].…”

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confidence: 99%

Measuring Electric Field Induced Subpicometer Displacement of Step Edge Ions

et al. 2012

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We provide unambiguous evidence that the applied electrostatic field displaces step atoms of ionic crystal surfaces by subpicometers in different directions via the measurement of the lateral force interactions by bimodal dynamic force microscopy combined with multiscale theoretical simulations. Such a small imbalance in the electrostatic interaction of the shifted anion-cation ions leads to an extraordinary long-range feature potential variation and is now detectable with the extreme sensitivity of the bimodal detection.

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“…The topography image in Figure 4(a) shows many noise lines, which represent displacements of molecules that are caused by interaction with the scanning tip. 41,42 Only few stable ZnDCPPs are observed and appear as bright dots with a diameter of about 2 nm. They are mainly found on the terraces.…”

Section: B Stability Of Zndcpp Configurationsmentioning

confidence: 99%

Thermally induced anchoring of a zinc-carboxyphenylporphyrin on rutile TiO2 (110)

Jöhr

Hinaut

Pawlak

et al. 2017

The Journal of Chemical Physics

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Functionalization of surfaces has become of high interest for a wealth of applications such as sensors, hybrid photovoltaics, catalysis, and molecular electronics. Thereby molecule-surface interactions are of crucial importance for the understanding of interface properties. An especially relevant point is the anchoring of molecules to surfaces. In this work, we analyze this process for a zinc-porphyrin equipped with carboxylic acid anchoring groups on rutile TiO2 (110) using scanning probe microscopy. After evaporation, the porphyrins are not covalently bound to the surface. Upon annealing, the carboxylic acid anchors undergo deprotonation and bind to surface titanium atoms. The formation of covalent bonds is evident from the changed stability of the molecule on the surface as well as the adsorption configuration. Annealed porphyrins are rotated by 45° and adopt another adsorption site. The influence of binding on electronic coupling with the surface is investigated using photoelectron spectroscopy. The observed shifts of Zn 2p and N 1s levels to higher binding energies indicate charging of the porphyrin core, which is accompanied by a deformation of the macrocycle due to a strong interaction with the surface.

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Functionalized Truxenes: Adsorption and Diffusion of Single Molecules on the KBr(001) Surface

Cited by 59 publications

References 65 publications

Single Macromolecule Diffusion in Confined Environments

Single Macromolecule Diffusion in Confined Environments

Measuring Electric Field Induced Subpicometer Displacement of Step Edge Ions

Thermally induced anchoring of a zinc-carboxyphenylporphyrin on rutile TiO2 (110)

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