近日，兰州大学张浩力团队报道了打破干扰驱动的反转电流以提高单分子电导。2025年10月14日，《德国应用化学》杂志发表了这一成果。

控制单分子结中的电荷输运对于推进分子电子学是必不可少的。研究组展示了一种新的策略，通过防止破坏性量子干涉（DQI）制度中的反转电流形成来显著提高交叉共轭系统的电导。

研究组设计了用氢键二酮（OHO）或硼配位环（NBN， NBO， OBO）取代元取代苯基环的分子，它们都保持六边形交叉共轭拓扑结构。实验和理论分析表明，抑制反向电流会产生反直觉的电导增强。用二酮（OHO）代替原型间苯基环（mPh）可使电导提高一个数量级。硼配位进一步协同调节量子干涉和能级，使OBO的电导史无前例地增加了两个数量级（从10^-5.39 G₀增加到10^-3.41 G₀）。这项工作建立了一个范例，有效的电导调制通过有针对性的反转电流抑制，实现合理设计量子干涉分子器件。

附：英文原文

Title: Breaking Interference-Driven Reversal Currents to Boost Single-Molecule Conductance

Author: Shun-Da Wu, Shu-Tong Liu, Zi-Ming Cai, Bing Sun, Xiao-Di Liu, Li-Yu-Yang Shi, Colin J. Lambert, Hao-Li Zhang

Issue&Volume: 2025-10-14

Abstract: Controlling charge transport in single-molecule junctions is essential for advancing molecular electronics. This study demonstrates a novel strategy to dramatically enhance conductance in cross-conjugated systems by preventing reversal current formation in destructive quantum interference (DQI) regimes. We design four molecules with meta-substituted phenyl rings replaced by hydrogen-bonded diketone (OHO) or boron-coordinated rings (NBN, NBO, OBO), all maintaining hexagonal cross-conjugated topology. Experimental and theoretical analyses reveal a counterintuitive conductance enhancement arising from suppressed reversal currents. Replacing the prototype m-phenyl ring (mPh) with diketone (OHO) elevates conductance by one order of magnitude. Further boron coordination synergistically modulates quantum interference and energy levels, achieving an unprecedented two orders of magnitude increase in conductance in OBO (from 105.39 G0 to 103.41 G0). This work establishes a paradigm for efficient conductance modulation via targeted reversal current suppression, enabling rationally designed quantum-interference molecular devices.

DOI: 10.1002/anie.202520318

Source: https://onlinelibrary.wiley.com/doi/10.1002/anie.202520318