All about (N-hexadecylquinolin-4-ium-1-yl)methylidenetricyanoquinodimethanide, a unimolecular rectifier of electrical current

被引：72

作者：

Metzger, RM ^{[1
]}

机构：

[1] Univ Alabama, Dept Chem, Lab Mol Elect, Tuscaloosa, AL 35487 USA

来源：

JOURNAL OF MATERIALS CHEMISTRY | 2000年 / 10卷 / 01期

关键词：

D O I：

10.1039/a903888d

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

We found unimolecular rectification in a single molecule, (N-hexadecylquinolin-4-ium-1-yl)methylidenetricyanoquinomethanide, in which the ground state is zwitterionic: D+-pi-A(-), and has a large dipole moment (43 D) while the first excited state is undissociated: D-0-pi-A(0) (and has a smaller moment, between 3 and 9 D). The intervalence optical absorption band connecting these two states is strongly hypsochromic. Spectroscopic measurements (FTIR, NMR, VIS-UV, XPS) all confirm this assignment. This significant 'first step' to unimolecular electronics, i.e. a rectifier only 2.3 nm thick, confirms a 1974 proposal by Aviram and Ratner. However, the 'real proof' that the large current under forward bias actually travels through the molecule, has not yet been obtained.

引用

页码：55 / 62

页数：8

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