Weiss Emily A, Wasielewski Michael R, Ratner Mark A
Department of Chemistry and Center for Nanofabrication and Molecular Self-Assembly, Northwestern University, 2145, N. Sheridan Rd., IL 60208-3113, Evanston, USA,
Top Curr Chem. 2005;257:103-33. doi: 10.1007/b136068.
In this chapter, we explore experimental and theoretical aspects of molecular wire-like charge transport from the mechanistic point of view. We discuss competition between coherent superexchange and sequential mechanisms of transport through donor-bridge-acceptor systems, where the donor and acceptor are either molecules or metal/semiconductor contacts. The focus is on the two major determinants of mechanism: electronic coupling and energy level matching. Some methods of calculating conductance are outlined, and the relationship between conductance in a metal/molecule/metal junction and electron transfer, where donor and acceptor have relatively discrete electronic energy levels is explored. Finally, we give several examples of chemical systems that have displayed wire-like behavior and discuss their characterization.
在本章中，我们从机理的角度探讨分子线状电荷传输的实验和理论方面。我们讨论了通过供体-桥-受体系统的相干超交换和顺序传输机制之间的竞争，其中供体和受体可以是分子或金属/半导体接触。重点是机制的两个主要决定因素：电子耦合和能级匹配。概述了一些计算电导的方法，并探讨了金属/分子/金属结中的电导与电子转移之间的关系，其中供体和受体具有相对离散的电子能级。最后，我们给出了几个表现出线状行为的化学系统的例子，并讨论了它们的表征。
