Multichannel Conductance of Folded Single‐Molecule Wires Aided by Through‐Space Conjugation

Chen, Long; Wang, Yahao; He, Bo; Nie, Han; Hu, Rongrong; Huang, Fei; Qin, Anjun; Zhou, Xiao‐Shun; Zhao, Zujin; Tang, Ben Zhong

doi:10.1002/anie.201411909

Cited by 97 publications

(67 citation statements)

References 35 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…That overlap vanishes in m-CB and p-CB,which is due to the relatively larger distances between the two phenyl groups in their molecular skeletons (Supporting Information, Figure S14). [24] In conclusion, we have demonstrated the presence of QI in charge transport through multicenter bonding system by experimental and theoretical investigation of single-molecule carborane junctions with all possible connectivities.W ef ind that the single-molecule conductance for the three connectivities of carboranes reduces as the following trend: o-CB > p-CB > m-CB,inwhich the shorter molecule junctions of m-CB shows lower single-molecule conductance than p-CB.The DFT calculations also support the length-independent conductance trend, and the orbital symmetry rule provides an intuitive understanding of the QI in carborane system. [24] In conclusion, we have demonstrated the presence of QI in charge transport through multicenter bonding system by experimental and theoretical investigation of single-molecule carborane junctions with all possible connectivities.W ef ind that the single-molecule conductance for the three connectivities of carboranes reduces as the following trend: o-CB > p-CB > m-CB,inwhich the shorter molecule junctions of m-CB shows lower single-molecule conductance than p-CB.The DFT calculations also support the length-independent conductance trend, and the orbital symmetry rule provides an intuitive understanding of the QI in carborane system.…”

Section: Methodsmentioning

confidence: 69%

Multicenter‐Bond‐Based Quantum Interference in Charge Transport Through Single‐Molecule Carborane Junctions

et al. 2019

View full text Add to dashboard Cite

Molecular components are vital to introduce and manipulate quantum interference (QI) in charge transport through molecular electronic devices.Uptonow,the functional molecular units that show QI are mostly found in conventional p-a nd s-bond-based systems;i ti st hus intriguing to study QI in multicenter bonding systems without both p-a nd sconjugations.N ow the presence of QI in multicenter-bondbased systems is demonstrated for the first time,t hrough the single-molecule conductance investigation of carborane junctions.W ef ind that all the three connectivities in carborane frameworks showdifferent levels of destructive QI, which leads to highly suppressed single-molecule conductance in para-and meta-connected carboranes.T he investigation of QI into carboranes provides ap romising platform to fabricate molecular electronic devices based on multicenter bonds.Quantum interference (QI) offers the unique opportunity to tune charge transport through molecular devices and materials, [1] which leads to various applications such as QIbased thermoelectrics, [2] molecular memory, [3] molecular transistors, [4] and sensors. [5] Them olecular building blocks play avital role in investigating QI-based molecular junctions. Up to now,the molecular building blocks with QI are mostly found in conventional two-center-two-electron (2c-2e) bondbased systems,w hich lead to p-interference [1d, 3, 4, 6] and sinterference. [2b] In the p systems,the involvement of s bonds are inevitable,a nd the p-interference can only suppress the p channels,l eaving the s channels unaffected. When the molecular building blocks are only constructed from s bonds with the vanishing of p channels,t he s-interference will lead to strong conductance suppression, as recently demonstrated in s-conjugated silane system. [2b] Besides the 2c-2e bondbased system, inorganic clusters based on metal-metal bonds were also found to show QI. [7] These progresses suggest the great potential of exploring QI in distinctive bonding systems.Besides the conventional 2c-2e bonds,t here exist abundantly unconventional multicenter bonding systems,showing much richer patterns to form bonds with the absence of both p and s conjugations (Figure 1a). Thus,whether and how QI is present in those multicenter bonding systems become an unexplored and promising avenue.T oe xplore such multicenter-bond-based QI, carborane is an ideal molecular building block. Since the carborane framework is constructed from three-center-two-electron( 3c-2e) bonds,t he electrons of the 3c-2e bonds can delocalize around the framework, ensuring efficient conjugation between each multicenter bond. Thee fficient conjugation of carborane leads to distinctively three-dimensional aromaticity [8] and high stability, [9] which has already been applied in ab road spectrum of fields, [9b,10] such as catalysis, [11] supramolecular chemistry, [12] and optoelectronics. [13] Thus the single-molecule conductance investigation of carborane provides an ideal testbed to investigate the multicenter-bond-based QI, which w...

show abstract

Section: Methodsmentioning

confidence: 69%

Multicenter‐Bond‐Based Quantum Interference in Charge Transport Through Single‐Molecule Carborane Junctions

et al. 2019

View full text Add to dashboard Cite

show abstract

“…The synthetic procedure for obtaining f ‐TPE‐PV has been described elsewhere . f‐TPE‐PVP was synthesized according to the procedures as follows: A 250 mL two‐necked round‐bottomed flask was charged with f ‐TPE‐PV (1.61 g, 3.0 mmol), iodobenzene (1.84 g, 9.0 mmol), Pd(OAc) 2 (40 mg, 0.18 mmol), n Bu 4 NCl (1.67 g, 6.0 mmol), and Na 2 CO 3 (636 mg, 6.0 mmol).…”

Section: Methodsmentioning

confidence: 99%

Spectroscopic and Theoretical Characterization of Through‐Space Conjugation of Foldamers with a Tetraphenylethene Hinge

Luo

Zhao

et al. 2017

Chemistry A European J

Self Cite

View full text Add to dashboard Cite

Through-space conjugation is an important noncovalent interaction in artificial materials and biomacromolecules. Establishing relationships between geometry and property is of high significance to provide deeper insights into this phenomenon. In this work, we have focused on the through-space conjugation in a new class of foldamers with a folded tetraphenylethene core. We have studied its impact on the photophysical properties through experimental measurements and theoretical calculations. It is found that the through-space conjugation makes significant contributions to the short-wavelength absorption in these foldamers. Moreover, these foldamers exhibit aggregation-enhanced emission (AEE) and apparent blue shifts in their emission spectra on going from solution to aggregates. The structural changes are smaller in the aggregated state than those in the isolated state during the excited-state relaxation process, which results in lower re-organization energies. This accounts for the blueshifted and enhanced emissions in the aggregates.

show abstract

“…The current curves were treated by the logarithm and binning, and a conductance histogram was constructed. More details can be seen in our previous reports [30,31,32,33]. …”

Section: Methodsmentioning

confidence: 99%

Detecting Electron Transport of Amino Acids by Using Conductance Measurement

Huang

et al. 2017

Sensors

Self Cite

View full text Add to dashboard Cite

The single molecular conductance of amino acids was measured by a scanning tunneling microscope (STM) break junction. Conductance measurement of alanine gives out two conductance values at 10−1.85 G0 (1095 nS) and 10−3.7 G0 (15.5 nS), while similar conductance values are also observed for aspartic acid and glutamic acid, which have one more carboxylic acid group compared with alanine. This may show that the backbone of NH2–C–COOH is the primary means of electron transport in the molecular junction of aspartic acid and glutamic acid. However, NH2–C–COOH is not the primary means of electron transport in the methionine junction, which may be caused by the strong interaction of the Au–SMe (methyl sulfide) bond for the methionine junction. The current work reveals the important role of the anchoring group in the electron transport in different amino acids junctions.

show abstract

Multichannel Conductance of Folded Single‐Molecule Wires Aided by Through‐Space Conjugation

Cited by 97 publications

References 35 publications

Multicenter‐Bond‐Based Quantum Interference in Charge Transport Through Single‐Molecule Carborane Junctions

Multicenter‐Bond‐Based Quantum Interference in Charge Transport Through Single‐Molecule Carborane Junctions

Spectroscopic and Theoretical Characterization of Through‐Space Conjugation of Foldamers with a Tetraphenylethene Hinge

Detecting Electron Transport of Amino Acids by Using Conductance Measurement

Contact Info

Product

Resources

About