多环（杂）芳烃桥联双金属化合物的合成及其性能研究

分子导线是分子元件与外部联系的桥梁，是实现分子电子器件的关键元件。但大多数分子导线的电子传输能力随着分子长度的增加，呈指数衰减。最近的理论计算发现并多苯类化合物是一类低电阻的分子导线，且其电导(electrical conductance)并不随着分子长度的增加而呈指数衰减，而是随苯环的奇偶数发生波动（oscillation）。为了探寻具有优良电子传输能力的候选分子导线，本申请拟将具有多环（杂）芳烃结构单元（如并多苯、并多苯噻吩和并多噻吩）引入金属有机分子导线的桥链中，设计合成多环（杂）芳烃桥联的共轭双金属化合物，利用电化学、近红外光谱及理论计算等方法研究：（1）多环（杂）芳烃桥链的电子传输能力; (2) 多环（杂）芳烃桥链长度对其电子传输能力的影响; (3)不同类型多环（杂）芳烃桥链的电子传输能力差异。最终筛选出具有优良电子传输能力，且其电子传输能力随分子长度的增加衰减较缓慢的分子导线。

Molecular wires are the important contents of molecular electronics and the base of molecular electronic devices. The electron transport of most of molecular wires is shown to decrease exponentially with length. Recently, theoretical studies showed that acenes are the most attractive candidates for low-resistance molecular-scale wires, and their electrical conductance isn't shown to decrease exponentially with length. In contrast, the conductance of the acenes is found to oscillate with number of benzene rings. The major objectives of this proposed research are: (a) to synthesize and characterize acene- and heteroacene -bridged bimetallic complexes, (b) to investigate their electron transport properties, and (c) to reveal how molecular length affect the electron transport. Upon the completion of the proposed research, we hope to find some candidates for low-resistance molecular-scale wires.