Smaller and smarter: this is the aim of research in the quest for ever faster electronic devices smaller in size but capable of performing more complicated tasks.
Devices consisting of the smallest possible components, molecular parts, have emerged as the answer. Molecular wires, the most basic components of molecular electronic circuits, need to be accurately adjusted for optimal performance.
Y. Tanaka, T. Koike, and M. Akita of the Chemical Resources Laboratory, Tokyo Institute of Technology, reveal the key factor for tuning wire-like performance in the Short Communication published in the European Journal of Inorganic Chemistry.
The factors affecting the communication performance of molecular devices are important for the development of molecular electronics. Parts of molecular electronic circuits (wires, switches, resistors, diodes, etc.) must have adjustable electronic properties to optimize this communication. Akita et al. prepared a molecular wire containing a C?C moiety between two iron centers. The communication between the iron centers was modified by coordination of a dicobalt cluster to the C?C part of the wire. Fine tuning was achieved by attaching, removing, or replacing the ligands on the added cobalt system as needed, which changed the electronic properties of the Co atoms with respect to those of the Fe atoms, thus controlling the transfer of electrons between the iron centers over a path through the cobalt atoms. In contrast to the direct Fe–Fe transition mechanism for the diiron wire, the communication mechanism of the dicobalt adducts involved indirect Fe–Co–Fe electron transfer. The mixed-valence characteristics of the compounds were studied by electrochemical and spectroscopic methods. The diiron compound belongs to Robin–Day Class III, and the dicobalt adducts have properties that place them between Class IIA and IIB. All molecular wires reported in this paper can be interconverted easily in a reversible manner.
The most important contribution of this study to the understanding of fine tuning of molecular devices is the key role played by the donor properties of the ligands attached to the cobalt fragments on the path between the two communicating iron centers. It was demonstrated that the properties of electron transfer through the molecular wire could be adjusted by tailoring the electronic properties of these ligands.
Author: Munetaka Akita, Tokyo Institute of Technology, Yokohama (Japan), http://www.res.titech.ac.jp/~smart/A_akita_e.html
Title: Reversible, Fine Performance Tuning of an Organometallic Molecular Wire by Additi on, Ligand Replacement and Removal of Dicobalt Fragments
European Journal of Inorganic Chemistry , 2010, No. 23, 3571–3575, Permalink to the article: http://dx.doi.org/10.1002/ejic.201000661
Further reports about: > Bird Communication > Cobalt-Controlled > Dicobalt > Molecular Target > Molecular Wires > Organometallic > Organometallic Molecular Wire > Performance Measurement-Systems > Tuning > electronic circuit > electronic properties > information technology > inorganic > molecular electronic circuits > molecular electronics
Repairing damaged hearts with self-healing heart cells
22.08.2017 | National University Health System
Biochemical 'fingerprints' reveal diabetes progression
22.08.2017 | Umea University
Whether you call it effervescent, fizzy, or sparkling, carbonated water is making a comeback as a beverage. Aside from quenching thirst, researchers at the University of Illinois at Urbana-Champaign have discovered a new use for these "bubbly" concoctions that will have major impact on the manufacturer of the world's thinnest, flattest, and one most useful materials -- graphene.
As graphene's popularity grows as an advanced "wonder" material, the speed and quality at which it can be manufactured will be paramount. With that in mind,...
Physicists at the University of Bonn have managed to create optical hollows and more complex patterns into which the light of a Bose-Einstein condensate flows. The creation of such highly low-loss structures for light is a prerequisite for complex light circuits, such as for quantum information processing for a new generation of computers. The researchers are now presenting their results in the journal Nature Photonics.
Light particles (photons) occur as tiny, indivisible portions. Many thousands of these light portions can be merged to form a single super-photon if they are...
For the first time, scientists have shown that circular RNA is linked to brain function. When a RNA molecule called Cdr1as was deleted from the genome of mice, the animals had problems filtering out unnecessary information – like patients suffering from neuropsychiatric disorders.
While hundreds of circular RNAs (circRNAs) are abundant in mammalian brains, one big question has remained unanswered: What are they actually good for? In the...
An experimental small satellite has successfully collected and delivered data on a key measurement for predicting changes in Earth's climate.
The Radiometer Assessment using Vertically Aligned Nanotubes (RAVAN) CubeSat was launched into low-Earth orbit on Nov. 11, 2016, in order to test new...
A study led by scientists of the Max Planck Institute for the Structure and Dynamics of Matter (MPSD) at the Center for Free-Electron Laser Science in Hamburg presents evidence of the coexistence of superconductivity and “charge-density-waves” in compounds of the poorly-studied family of bismuthates. This observation opens up new perspectives for a deeper understanding of the phenomenon of high-temperature superconductivity, a topic which is at the core of condensed matter research since more than 30 years. The paper by Nicoletti et al has been published in the PNAS.
Since the beginning of the 20th century, superconductivity had been observed in some metals at temperatures only a few degrees above the absolute zero (minus...
16.08.2017 | Event News
04.08.2017 | Event News
26.07.2017 | Event News
22.08.2017 | Health and Medicine
22.08.2017 | Materials Sciences
22.08.2017 | Life Sciences