Dipole effects on the formation of molecular junctions.

摘要: Measuring the tunnelling current is a promising way of identifying individual molecules in liquid, wherein molecular conformations an electrode gap play crucial role electron transport properties. Here we report that dipole interactions with electric field effectively restrict configurational degrees freedom metal–molecule–metal systems. We utilized mechanically tunable Au nanoelectrode to electrically detect diaminobenzene isomers. found suppression variation single-molecule conductance 1,2-benzenediamines (BDAs) water suggesting significant influence huge created between nanoprobes align along potential gradient and concomitant formation well-defined junction structures for through-space coupled one side electrodes. On other hand, effect was absent 1,3- 1,4-BDAs, which attributed their smaller moments more rigid chemical connections electrodes via Au–amine bonds.