Conductance of a single molecule anchored by an isocyanide substituent to gold electrodes
Conductance of a single molecule anchored by an isocyanide substituent to gold electrodes
复制标题
DOI：
10.1063/1.2392816
复制
发表时间：
2006-10
影响因子：
4
通讯作者：
M. Kiguchi;S. Miura;K. Hara;M. Sawamura;K. Murakoshi
中科院分区：
文献类型：
--
作者：
M. Kiguchi;S. Miura;K. Hara;M. Sawamura;K. Murakoshi
本文用二取代的[异氰化物（CN-）、硫醇（S-）和氰化物（NC-）]苯研究了锚定基团对单分子桥接两个Au电极电导的影响。单Au/1，4-diisocyanobenzene/Au结的电导率为3×10− 3G 0（= 2 e2 scinh），该结由异氰化物通过C原子固定（与Au-CN键连接）。该值相当于具有Au-S键的单个Au/1，4-苯二硫醇/Au结的4×10− 3G 0。具有Au-NC键的Au/1，4-二氰基苯/Au分子结没有显示出明确的电导值。金属-分子键强度通过分子结在击穿前被拉伸的距离来估计。具有Au-CN键的分子结的拉伸长度与Au结的拉伸长度相当，表明Au-CN键比Au-Au键强。
The effect of anchoring group on the electrical conductance of a single molecule bridging two Au electrodes was studied using disubstituted [isocyanide (CN–), thiol (S–), or cyanide (NC–)] benzene. The conductance of a single Au/1,4-diisocyanobenzene/Au junction anchored by isocyanide via a C atom (junction with the Au–CN bond) was 3×10−3G0(=2e2∕h). The value was comparable to 4×10−3G0 of a single Au/1,4-benzenedithiol/Au junction with the Au–S bond. The Au/1,4-dicyanobenzene/Au molecular junction with the Au–NC bond did not show well-defined conductance values. The metal-molecule bond strength was estimated by the distance over which the molecular junction was stretched before breakdown. The stretched length of the molecular junction with the Au–CN bond was comparable to that of the Au junction, indicating that the Au–CN bond was stronger than the Au–Au bond.