Stable Room-Temperature Molecular Negative Differential Resistance Based on Molecule-Electrode Interface Chemistry was written by Salomon, Adi;Arad-Yellin, Rina;Shanzer, Abraham;Karton, Amir;Cahen, David. And the article was included in Journal of the American Chemical Society in 2004.Formula: C15H29BrO2 This article mentions the following:
The authors show reproducible, stable neg. differential resistance (NDR) at room temperature in mol.-controlled, solvent-free devices, based on reversible changes in mol.-electrode interface properties. The active component is the cyclic disulfide end of mols. adsorbed onto Hg. As this active component is reduced, the Hg-mol. contact is broken, and an insulating barrier at the mol.-electrode interface is formed. Therefore, the alignment of the mol. energy levels, relative to the Fermi levels of the electrodes, is changed. This effect results in a decrease in the current with voltage increase as the reduction process progresses, leading to the so-called NDR behavior. The effect is reproducible and repeatable over >50 scans without any reduction in the current. The stability of the system, which is in the solid state except for the Hg, is due to the mol. design where long alkyl chains keep the mols. aligned with respect to the Hg electrode, even when they are not bound to it any longer. In the experiment, the researchers used many compounds, for example, 15-Bromopentadecanoic acid (cas: 56523-59-2Formula: C15H29BrO2).
15-Bromopentadecanoic acid (cas: 56523-59-2) belongs to organobromine compounds. Organo bromine compounds are versatile compounds and are widely used in diverse fields. Organo bromine derivatives are used in the dye sector, as an indicator in analytical chemistry (Bromothymol blue is a popular indicator). The reactivity of organobromine compounds resembles but is intermediate between the reactivity of organochlorine and organoiodine compounds. For many applications, organobromides represent a compromise of reactivity and cost.Formula: C15H29BrO2
Referemce:
Bromide – Wikipedia,
bromide – Wiktionary