Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

Cobalt-Controlled Communication

06.09.2010
Fine Performance Tuning of an Organometallic Molecular Wire by Added Dicobalt Fragments

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

Munetaka Akita | Wiley-VCH
Further information:
http://www.eurjic.org
http://www.res.titech.ac.jp/~smart/A_akita_e.html

More articles from Life Sciences:

nachricht Show me your leaves - Health check for urban trees
12.12.2017 | Gesellschaft für Ökologie e.V.

nachricht Liver Cancer: Lipid Synthesis Promotes Tumor Formation
12.12.2017 | Universität Basel

All articles from Life Sciences >>>

The most recent press releases about innovation >>>

Die letzten 5 Focus-News des innovations-reports im Überblick:

Im Focus: Long-lived storage of a photonic qubit for worldwide teleportation

MPQ scientists achieve long storage times for photonic quantum bits which break the lower bound for direct teleportation in a global quantum network.

Concerning the development of quantum memories for the realization of global quantum networks, scientists of the Quantum Dynamics Division led by Professor...

Im Focus: Electromagnetic water cloak eliminates drag and wake

Detailed calculations show water cloaks are feasible with today's technology

Researchers have developed a water cloaking concept based on electromagnetic forces that could eliminate an object's wake, greatly reducing its drag while...

Im Focus: Scientists channel graphene to understand filtration and ion transport into cells

Tiny pores at a cell's entryway act as miniature bouncers, letting in some electrically charged atoms--ions--but blocking others. Operating as exquisitely sensitive filters, these "ion channels" play a critical role in biological functions such as muscle contraction and the firing of brain cells.

To rapidly transport the right ions through the cell membrane, the tiny channels rely on a complex interplay between the ions and surrounding molecules,...

Im Focus: Towards data storage at the single molecule level

The miniaturization of the current technology of storage media is hindered by fundamental limits of quantum mechanics. A new approach consists in using so-called spin-crossover molecules as the smallest possible storage unit. Similar to normal hard drives, these special molecules can save information via their magnetic state. A research team from Kiel University has now managed to successfully place a new class of spin-crossover molecules onto a surface and to improve the molecule’s storage capacity. The storage density of conventional hard drives could therefore theoretically be increased by more than one hundred fold. The study has been published in the scientific journal Nano Letters.

Over the past few years, the building blocks of storage media have gotten ever smaller. But further miniaturization of the current technology is hindered by...

Im Focus: Successful Mechanical Testing of Nanowires

With innovative experiments, researchers at the Helmholtz-Zentrums Geesthacht and the Technical University Hamburg unravel why tiny metallic structures are extremely strong

Light-weight and simultaneously strong – porous metallic nanomaterials promise interesting applications as, for instance, for future aeroplanes with enhanced...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

Event News

See, understand and experience the work of the future

11.12.2017 | Event News

Innovative strategies to tackle parasitic worms

08.12.2017 | Event News

AKL’18: The opportunities and challenges of digitalization in the laser industry

07.12.2017 | Event News

 
Latest News

Long-lived storage of a photonic qubit for worldwide teleportation

12.12.2017 | Physics and Astronomy

Multi-year submarine-canyon study challenges textbook theories about turbidity currents

12.12.2017 | Earth Sciences

Electromagnetic water cloak eliminates drag and wake

12.12.2017 | Power and Electrical Engineering

VideoLinks
B2B-VideoLinks
More VideoLinks >>>