Highly conductive molecular junctions were formed by direct binding of benzene molecules between two Pt electrodes. Measurements conductance, isotopic shift in inelastic spectroscopy, and shot noise compared with calculations provide indications for a stable junction where the molecule is preserved intact bonded to leads via carbon atoms. The has conductance comparable that metallic atomic (around 0.1-1G0), number transmission channels are controlled molecule's orientation at different...

The in situ observation of geometrical and electronic structural dynamics a single molecule junction is critically important order to further progress molecular electronics. Observations junctions are difficult, however, because sensitivity limits. Here, we report surface-enhanced Raman scattering (SERS) 4,4′-bipyridine under conditions current flow nanogap, by using nano-fabricated, mechanically controllable break (MCBJ) electrodes. When adsorbed at room temperature on metal nanoelectrodes...

The electronic structure and spin magnetism for few-layer-graphene nanoribbons synthesized by chemical vapor deposition have been investigated using near-edge x-ray absorption fine (NEXAFS) electron-spin resonance (ESR). For the pristine sample, a prepeak was observed below ${\ensuremath{\pi}}^{\ensuremath{\ast}}$ peak close to Fermi level in NEXAFS, indicating presence of additional states level. intensity this decreased with increasing annealing temperature disappeared after above...

Aromatic stacks formed through self-assembly are promising building blocks for the construction of molecular electronic devices with adjustable functions, in which noncovalently bound π-stacks act as replaceable modular components. Here we describe electron-transport properties single-molecule aromatic aligned a self-assembled cage, using scanning probe microscopic and break junction methods. Same different pairs stacked within cage holder, leads to diverse functions. The insertion same...

Abstract Aromaticity is a fundamental concept in chemistry. It described by Hückel’s rule that states cyclic planar π-system aromatic when it shares 4 n +2 π-electrons and antiaromatic possesses π-electrons. Antiaromatic compounds are predicted to exhibit remarkable charge transport properties high redox activities. However, has so far only been possible measure with reduced aromaticity but not species due their energetic instability. Here, we address these issues investigating the...

A single molecular resistive (conductance) switch via control of anchoring positions was examined by using a molecule consisting more than two same anchors. For this purpose, we adopted the covered quaterthiophene (QT)-based wire junction. The QT-based consisted thiophene ring anchors on each side; thus, shift potentially possible without change in binding modes and distortion intramolecular structure. We observed three distinct conductance states scanning tunneling microscope-based break...

Adsorption sites of molecules critically determine the electric/photonic properties and stability heterogeneous molecule–metal interfaces. Then, selectivity adsorption site is essential for development fields including organic electronics, catalysis, biology. However, due to current technical limitations, site-selectivity, i.e., precise determination molecular site, remains a major challenge because difficulty in selection meaningful one among sites. We have succeeded single site-selection...

A single-molecule junction shows novel functionalities caused by its unique structure of a low-dimensional nano-material with two metal–molecule interfaces.

By use of the reversible trimerization boronic acids, series boroxine cages 3-mer, 6-mer, and 12-mer were constructed from rationally designed diboronic acids whose bond angles between two C-B bonds are 60°, 84°, 117°, respectively. Boroxine 6-mer have 1.5 2.5 nm sized cavities,

Exploration of highly conductive molecules is essential to achieve single-molecule electronic devices. The present paper describes the results on conductance study polyyne wires doped with organometallic Ru(dppe)2 fragment, X—(C≡C)n—Ru(dppe)2—(C≡C)n—X. metallapolyyne end-capped gold fragments (X = AuL) are subjected measurements STM break junction technique, which reveal high (10–3–10–2 G0; n 2–4) low attenuation factor (0.25 Å–1) and contact resistance (33 kΩ). A unique "'doping'" effect...

Single molecular junctions, in which a single molecule bridges between metal electrodes, have attracted wide attention as novel properties can appear due to their peculiar geometrical and electronic characters. The junction has also its potential application ultrasmall devices, where molecules are utilized active components. Thus, fabrication of junctions well understanding controlling (e.g. conductance, optical magnetic properties) become long-standing goals scientists engineers. This...

Face-to-face communication: Electron transport through single-molecule π stacks was directly measured between gold nanogap electrodes by using STM (see scheme). Self-assembled coordination cages containing π-stacked aromatic molecules are conductive (right), whereas the empty cage is not (left). Detailed facts of importance to specialist readers published as ”Supporting Information”. Such documents peer-reviewed, but copy-edited or typeset. They made available submitted authors. Please note:...

We have designed and synthesized a pyridine-based tripodal anchor unit to construct single-molecule junction with gold electrode. The advantage of anchoring surface was unambiguously demonstrated by cyclic voltammetry measurements. X-ray photoelectron spectroscopy measurements indicated that the π orbital pyridine contributes physical adsorption surface. conductance consists diphenyl acetylene measured modified scanning tunneling microscope techniques successfully determined be 5 ± 1 ×...

We investigated the effect of anchoring group position on formation and electric conductance single molecule junctions for benzenedithiol benzenediamine by scanning tunneling microscope break junction technique. The conductances 1,4-benzenedithiol, 1,3-benzenedithiol, 1,4-benzenediamine, 1,3-benzenediamine molecules were 0.005 (±0.001) G0 (G0 = 2e2/h), 0.004 G0, 0.01 (±0.003) (±0.002) respectively. No 1,2-disubstituted benzene formed junctions. While 1,4-position provided larger than...

A triphosphasumanene trisulfide was designed and synthesized as an out-of-plane anisotropic π-conjugated molecule. Incorporating three phosphine sulfide moieties into a sumanene skeleton induced cumulative anisotropy with large dipole moment (12.0 D), which is aligned in perpendicular direction respect to the π-framework more than twice those of conventional molecules. In crystal, molecules align form columnar structures, electron-rich electron-deficient sides face each other. The...

We report, herein, the design, synthesis, and properties of new materials directed toward molecular electronics. A transition metal-containing insulated wire was synthesized through coordination polymerization a Ru(II) porphyrin with an bridging ligand well-defined structure. The displayed not only high linearity rigidity, but also intramolecular charge mobility. Owing to unique bond, interconversion between monomer polymer states realized under carbon monoxide atmosphere or UV irradiation....

Ion nanowire: Electron transport through discrete gold-ion arrays within coordination cages was directly measured between Au nanogap electrodes (see picture) using STM. Precise calibration of the electron distance demonstrates that Au-ion exhibit good conductance and only moderate loss with increasing length. As a service to our authors readers, this journal provides supporting information supplied by authors. Such materials are peer reviewed may be re-organized for online delivery, but not...

Recent developments of single-molecule conductance measurements allow us to understand fundamental conducting properties molecular wires. While a wide variety organic wires have been studied so far, inorganic and organometallic received much less attention. However, with transition-metal atoms show interesting features functions distinct from those These originate mainly metal-ligand dπ-pπ interactions metal-metal d-d interactions. Thanks the rich combination metal supporting ligands,...

Electronic and structural detail at the electrode-molecule interface have a significant influence on charge transport across molecular junctions. Despite decisive role of metal-molecule interface, complete electronic characterization remains challenge. This is in no small part due to current experimental limitations. Here, we present comprehensive approach obtain detailed description single-molecule junctions, based current-voltage (I-V) measurements. Contrary conventional conductance...

When employing self-assembled monolayers (SAMs) for tuning surface and interface properties, organic molecules that enable strong binding to the substrate, large-area structural uniformity, precise alignment of functional groups, control their density are highly desirable. To achieve these goals, tripod systems bearing multiple bonding sites have been developed as an alternative conventional monodentate systems. Bonding all three has, however, hardly achieved, with consequence uniformity...

We present a simple but powerful method to determine the thicknesses of accumulation and depletion layers distribution curve injected carriers in organic field effect transistors. The conductivity semiconductors thin film transistors was measured in-situ continuously with bottom contact configuration, as function thickness at various gate voltages. Using this method, pentacene were determined be 0.9 nm (VG=-15 V) 5 (VG=15 V).

The effect of anchoring group on the electrical conductance a single molecule bridging two Au electrodes was studied using disubstituted [isocyanide (CN–), thiol (S–), or cyanide (NC–)] benzene. Au/1,4-diisocyanobenzene/Au junction anchored by isocyanide via C atom (junction with Au–CN bond) 3×10−3G0(=2e2∕h). value comparable to 4×10−3G0 Au/1,4-benzenedithiol/Au Au–S bond. Au/1,4-dicyanobenzene/Au molecular Au–NC bond did not show well-defined values. metal-molecule strength estimated...

Stable, single-molecule conducting-bridge configurations are typically identified from peak structures in a conductance histogram. In previous work on Pt with H2 at cryogenic temperatures it has been shown that near 1G0 identifies Pt-H2-Pt bridge. The histogram shows an additional structure lower not identified. Here, we show is likely due to hydrogen decorated chain contact the molecular

Abstract An electronic conductance with small fluctuations, which is stipulated in single‐molecule junctions, necessary for the precise control of devices. However, suppression fluctuations conventional molecular junctions intrinsically difficult because are related to contact and motion. In present study involving experimental theoretical investigations, it found that covering a single π ‐conjugated wire an α ‐cyclodextrin molecule promising technique suppressing fluctuations. The histogram...