Electric Field Breakdown in Single Molecule Junctions
作者:Haixing Li、Timothy A. Su、Vivian Zhang、Michael L. Steigerwald、Colin Nuckolls、Latha Venkataraman
DOI:10.1021/ja512523r
日期:2015.4.22
Here we study the stability and rupture of molecular junctions under high voltage bias at the single molecule/single bond level using the scanning tunneling microscope-based break-junction technique. We synthesize carbon-, silicon-, and germanium-based molecular wires terminated by aurophilic linker groups and study how the molecular backbone and linker group affect the probability of voltage-induced junction rupture. First, we find that junctions formed with covalent SAu bonds are robust under high voltage and their rupture does not demonstrate bias dependence within our bias range. In contrast, junctions formed through donoracceptor bonds rupture more frequently, and their rupture probability demonstrates a strong bias dependence. Moreover, we find that the junction rupture probability increases significantly above similar to 1 V in junctions formed from methylthiol-terminated disilanes and digermanes, indicating a voltage-induced rupture of individual SiSi and GeGe bonds. Finally, we compare the rupture probabilities of the thiol-terminated silane derivatives containing SiSi, SiC, and SiO bonds and find that SiC backbones have higher probabilities of sustaining the highest voltage. These results establish a new method for studying electric field breakdown phenomena at the single molecule level.
Torsional strain as a determinant for the polymerizability of cyclic olefins: the ring-opening metathesis polymerization of 1,1,2,2-tetramethyl-1,2-disilacyclopent-3-ene
作者:Lawrence R. Sita、Scott R. Lyon
DOI:10.1021/ja00075a069
日期:1993.11
Synthesis, Structure, and Chemistry of New, Mixed Group 14 and 16 Heterocycles: Nucleophile-Induced Ring Contraction of Mesocyclic Dications
作者:Eric Block、Evgeny V. Dikarev、Richard S. Glass、Jin、Bo Li、Xiaojie Li、Shao-Zhong Zhang
DOI:10.1021/ja065037j
日期:2006.11.1
More than 40 new 4- to 12-membered ring heterocycles containing various combinations of Group 14 and 16 elements Si, Sn, S, Se, and Te have been synthesized and fully characterized. Synthesis of these small-ring as well as medium-ring (mesocyclic) heterocycles from alpha,omega-dihalides is facilitated by the presence of gem-dialkylsilyl and gem-dialkylstannyl groups in the precursors. Conformations
Preparation of certain bromomethyl- and iodomethyl-substituted disilanes
作者:Kohei Tamao、Makoto Kumada
DOI:10.1016/s0022-328x(00)87516-6
日期:1971.8
with sodium iodide in acetone, although they coulc be made by the action of phosphoric acid and potassium iodide on the (methoxymethyl)disilanes, with yields and purities being much lower. 1,2-Bis(chloromethyl)tetramethyldisilane was prepared pure, but in very low yield, by the action of diazomethane on sym-dimethyltetrachlorodisilane followed by methylation of the remaining siliconchlorine bonds.