Chemistry 2011.org
Chemistry2011.org
All About Chemistry... 2011 and beyond

Related Stories

Direct observation of bond formations

A collaboration between researchers from KEK, the Institute for Basic Science (IBS), the Korea Advanced Institute of Science and Technology (KAIST), RIKEN, and the Japan Synchrotron Radiation Research Institute (JASRI) used the SACLA X-ray free electron laser (XFEL) facility for a real time visualization of the birth of a molecule that occurs via photo-induced formation of a Chemical-Bonds'>chemical bonds. This achievement was published in the online version of the scientific journal Nature (published on 19 February 2015).

Direct "observation" of the bond making, through a chemical reaction, has been longstanding dream for chemists. However, the distance between atoms is very small, at about 100 picometer, and the bonding is completed very quickly, taking less than one picosecond (ps). Hence, previously, one could only imagine the bond formation between atoms while looking at the chemical reaction progressing in the test-tube.

In this study, the research group focused on the process of photoinduced bond formation between gold (Au) ions dissolved in water. In the ground state  Au ions that are weakly bound to each other by an electron affinity and aligned in a bent geometry. Upon a photoexcitation, the S0 state rapidly converts into an excited state where Au-Au covalent bonds are formed among Au ions aligned in a linear geometry. Subsequently, the S1 state transforms to a triplet state  in 1.6 ps while accompanying further contraction of Au-Au bonds by 0.1 Å. Later, the T1 state of the trimer converts to a tetramer on nanosecond time scale. Finally, the Au ions returned to their original loosely interacting bent structure.

In this research, scientists directly observed a very fast chemical reaction, induced by the photo-excitation. Therefore, this method is expected to be a fundamental technology for understanding the light energy conversion reaction. The research group is actively working to apply this method to the development of viable renewable energy resources, such as a photocatalysts for artificial photosynthesis using sunlight.

Story Source:

The above story is based on materials provided by High Energy Accelerator Research Organization/KEK. Note: Materials may be edited for content and length.

Share this story with your friends!

Social Networking

Please recommend us on Facebook, Twitter and more:

Other social media tools

Global Partners
Feedback

Tell us what you think of Chemistry 2011 -- we welcome both positive and negative comments. Have any problems using the site? Questions?

About us

Chemistry2011 is an informational resource for students, educators and the self-taught in the field of chemistry. We offer resources such as course materials, chemistry department listings, activities, events, projects and more along with current news releases.

Events & Activities

Are you interested in listing an event or sharing an activity or idea? Perhaps you are coordinating an event and are in need of additional resources? Within our site you will find a variety of activities and projects your peers have previously submitted or which have been freely shared through creative commons licenses. Here are some highlights: Featured Idea 1, Featured Idea 2.

About you

Ready to get involved? The first step is to sign up by following the link: Join Here. Also don’t forget to fill out your profile including any professional designations.

Global Partners