Hydrogen-bond-induced quantum interference in single-molecule junctions of regioisomers

Abstract

Solvents can play a significant role in tuning the electrical conductance of single-molecule junctions. In this respect, protic solvents offer the potential to form hydrogen bonds with molecular backbones and...

In Situ Adjustable Nanogaps and In‐Plane Break Junctions

“…To further confirm that the low conductance truly results from the BDA dimer, ethanol was added during the self‐assembling process which could dissociate the intermolecular hydrogen bond because ethanol can form new hydrogen bonds with BDA; thus, destroying the original hydrogen bonds. [ 52 ] It is found that only the high conductance peak is presented, that is, the low conductance peak disappears after adding ethanol (Figure S9d–f, Supporting Information). This observation supports our hypothesis that the low conductance originates from the BDA dimer formed via the intermolecular hydrogen bond.…”

The pivotal role of non-covalent interactions in single-molecule charge transport

“…84 Ge et al took advantage of protic solvents to induce electrostatic gating and hydrogen bond formation using STM-BJ. 85 They interrogated the possibility of using protic solvent to tune hydrogen bond-mediated charge transport and even switch between destructive quantum interference (DQI) and constructive quantum interference (CQI) in a SMJ. Specifically, they used zwitterionic (BIT-Z) and neutral (BIT-N) forms of [2,2′-Bi-1 H -indene]-3,3′-dihydroxy-1,1-dione (BIT-OH 2 ) because theoretical calculations predicted that in the absence of solvents charge transport through BIT-Z and BIT-N is controlled by DQI and CQI, respectively.…”

Conductance of o-carborane-based wires with different substitution patterns

“…22 Molecular wires based on noncovalent through-space conjugation have been widely studied in recent decades, in which the π-electrons of adjacent stacked aromatic rings realize charge transport through spatial interaction, bringing unique physical and chemical phenomena. [23][24][25] Based on the above discussion, it is worthwhile to further explore the properties of molecules with the same molecular skeleton but different substitution positions of the anchor group, particularly for the o-carborane-based molecules with multiple conduction channels, which will reveal the relationship between QI effects, molecular configurations, and charge transport paths. Herein, we choose the o-carborane skeleton as the building block for molecular wires and explore the influence of through-space transport on conductance by changing the anchor group configuration ( p-OCB, m-OCB and o-OCB).…”

“…22 Molecular wires based on noncovalent through-space conjugation have been widely studied in recent decades, in which the π-electrons of adjacent stacked aromatic rings realize charge transport through spatial interaction, bringing unique physical and chemical phenomena. 23–25…”