ADVERTISEMENT
2 /3 FREE ARTICLES LEFT THIS MONTH Remaining
Chemistry matters. Join us to get the news you need.

If you have an ACS member number, please enter it here so we can link this account to your membership. (optional)

ACS values your privacy. By submitting your information, you are gaining access to C&EN and subscribing to our weekly newsletter. We use the information you provide to make your reading experience better, and we will never sell your data to third party members.

ENJOY UNLIMITED ACCES TO C&EN

Analytical Chemistry

Stretching Alters Magnetics

Cobalt complex's electron flow is disrupted when the square-shaped molecule is pulled into a rectangle

by Elizabeth K. Wilson
June 14, 2010 | APPEARED IN VOLUME 88, ISSUE 24

[+]Enlarge
Credit: Science
Stretching a cobalt complex tethered between two gold electrodes changes the molecule’s magnetic states.
8824scon_stretchcxd.jpg
Credit: Science
Stretching a cobalt complex tethered between two gold electrodes changes the molecule’s magnetic states.

The mechanical stretching of a single cobalt complex tethered between two gold electrodes alters the molecule’s magnetic states, changing the processes by which electrons flow through the system (Science 2010, 328, 1370). This strategy, developed by physics professor Daniel C. Ralph and postdoc Joshua J. Parks of Cornell University, and their colleagues, not only gives scientists an ideal tool for investigating subtle details of molecular magnetism but could also provide a way to control molecular spin states for applications such as information storage. The group connected an octahedrally symmetric cobalt complex to two gold electrodes. In its normal state, the complex has a cubic shape. They then stretched the complex, distorting it into a tetragon. When the molecule’s symmetry is broken, formerly degenerate spin states separate into discrete levels, which can be observed in spectral lines. This new level of mechanical control over the spin states allowed the group to study a complex, spin-dependent phenomenon known as the Kondo effect, in which the molecule interacts with neighboring conduction electrons.

X

Article:

This article has been sent to the following recipient:

Leave A Comment

*Required to comment