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
Link Discovered between Immune System, Brain Structure and Memory
26.04.2017 | Universität Basel
Researchers develop eco-friendly, 4-in-1 catalyst
25.04.2017 | Brown University
More and more automobile companies are focusing on body parts made of carbon fiber reinforced plastics (CFRP). However, manufacturing and repair costs must be further reduced in order to make CFRP more economical in use. Together with the Volkswagen AG and five other partners in the project HolQueSt 3D, the Laser Zentrum Hannover e.V. (LZH) has developed laser processes for the automatic trimming, drilling and repair of three-dimensional components.
Automated manufacturing processes are the basis for ultimately establishing the series production of CFRP components. In the project HolQueSt 3D, the LZH has...
Reflecting the structure of composites found in nature and the ancient world, researchers at the University of Illinois at Urbana-Champaign have synthesized thin carbon nanotube (CNT) textiles that exhibit both high electrical conductivity and a level of toughness that is about fifty times higher than copper films, currently used in electronics.
"The structural robustness of thin metal films has significant importance for the reliable operation of smart skin and flexible electronics including...
The nearby, giant radio galaxy M87 hosts a supermassive black hole (BH) and is well-known for its bright jet dominating the spectrum over ten orders of magnitude in frequency. Due to its proximity, jet prominence, and the large black hole mass, M87 is the best laboratory for investigating the formation, acceleration, and collimation of relativistic jets. A research team led by Silke Britzen from the Max Planck Institute for Radio Astronomy in Bonn, Germany, has found strong indication for turbulent processes connecting the accretion disk and the jet of that galaxy providing insights into the longstanding problem of the origin of astrophysical jets.
Supermassive black holes form some of the most enigmatic phenomena in astrophysics. Their enormous energy output is supposed to be generated by the...
The probability to find a certain number of photons inside a laser pulse usually corresponds to a classical distribution of independent events, the so-called...
Microprocessors based on atomically thin materials hold the promise of the evolution of traditional processors as well as new applications in the field of flexible electronics. Now, a TU Wien research team led by Thomas Müller has made a breakthrough in this field as part of an ongoing research project.
Two-dimensional materials, or 2D materials for short, are extremely versatile, although – or often more precisely because – they are made up of just one or a...
20.04.2017 | Event News
18.04.2017 | Event News
03.04.2017 | Event News
27.04.2017 | Health and Medicine
27.04.2017 | Information Technology
26.04.2017 | Materials Sciences