Nanotechnology Now

Our NanoNews Digest Sponsors
Heifer International



Home > Press > Real-time observation of bond formation by using femtosecond X-ray liquidography

a, The photochemical reaction of solutes supplied by a liquid-flowing system is triggered by a femtosecond optical laser pulse. Subsequently, a time-delayed X-ray pulse synchronized with the laser pulse probes the structural dynamics of the reaction. The scattering pattern is detected by a fast two-dimensional charge-coupled device detector as shown at the bottom. We measure time-resolved scattering patterns while varying the time delay between the laser and X-ray pulses. b, By integrating the two-dimensional scattering pattern azimuthally, subtracting solvent contributions, performing a Fourier transform and compensating for the depletion of the initial solute contribution due to photochemical reaction, we obtain one-dimensional RDFs in real space as shown in the plot at the top left. These display the interatomic distances of transient species and products. In this way, Au-Au bond lengths of the [Au(CN)2-]3 complex can be identified with sub-ångström accuracy, and the time-dependent structural changes of the metal complex can be determined in real time.
CREDIT: Center for Nanomaterials and Chemical Reactions, Institute for Basic Science (IBS)
a, The photochemical reaction of solutes supplied by a liquid-flowing system is triggered by a femtosecond optical laser pulse. Subsequently, a time-delayed X-ray pulse synchronized with the laser pulse probes the structural dynamics of the reaction. The scattering pattern is detected by a fast two-dimensional charge-coupled device detector as shown at the bottom. We measure time-resolved scattering patterns while varying the time delay between the laser and X-ray pulses. b, By integrating the two-dimensional scattering pattern azimuthally, subtracting solvent contributions, performing a Fourier transform and compensating for the depletion of the initial solute contribution due to photochemical reaction, we obtain one-dimensional RDFs in real space as shown in the plot at the top left. These display the interatomic distances of transient species and products. In this way, Au-Au bond lengths of the [Au(CN)2-]3 complex can be identified with sub-ångström accuracy, and the time-dependent structural changes of the metal complex can be determined in real time.

CREDIT: Center for Nanomaterials and Chemical Reactions, Institute for Basic Science (IBS)

Abstract:
The research team of the Center for Nanomaterials and Chemical Reactions at the Institute for Basic Science (IBS) has successfully visualized the entire process of bond formation in solution by using femtosecond time-resolved X-ray liquidography (femtosecond TRXL) for the first time in the world.

Real-time observation of bond formation by using femtosecond X-ray liquidography

Daejeon, Korea | Posted on February 26th, 2015

Every researcher's longstanding dream to observe real-time bond formation in chemical reactions has come true. Since this formation takes less than one picosecond, researchers have not been able to visualize the birth of molecules.

The research team has used femtosecond TRXL in order to visualize the formation of a gold trimer complex in real time without being limited by slow diffusion.

They have focused on the process of photoinduced bond formation between gold (Au) atoms dissolved in water. In the ground (S0) state, Au atoms are weakly bound to each other in a bent geometry by van der Waals interactions. On photoexcitation, the S0 state rapidly converts into an excited (S1) state, leading to the formation of covalent Au-Au bonds and bent-to-linear transition. Then, the S1 state changes to a triplet (T1) state with a time constant of 1.6 picosecond, accompanying further bond contraction by 0.1 Å. Later, the T1 state of the trimer transforms to a tetramer on nanosecond time scale, and Au atoms return to their original bent structure.

"By using femtosecond TRXL, we will be able to observe molecular vibration and rotation in the solution phase in real time," says Hyotcherl Ihee, the group leader of the Center for Nanomaterials at IBS, as well as the professor of the Department of Chemistry at Korea Advanced Institute of Science and Technology.

####

For more information, please click here

Contacts:
Sunny Kim

82-428-788-135

Copyright © Institute for Basic Science (IBS)

If you have a comment, please Contact us.

Issuers of news releases, not 7th Wave, Inc. or Nanotechnology Now, are solely responsible for the accuracy of the content.

Bookmark:
Delicious Digg Newsvine Google Yahoo Reddit Magnoliacom Furl Facebook

Related News Press

News and information

Researchers develop artificial building blocks of life March 8th, 2024

How surface roughness influences the adhesion of soft materials: Research team discovers universal mechanism that leads to adhesion hysteresis in soft materials March 8th, 2024

Two-dimensional bimetallic selenium-containing metal-organic frameworks and their calcinated derivatives as electrocatalysts for overall water splitting March 8th, 2024

Curcumin nanoemulsion is tested for treatment of intestinal inflammation: A formulation developed by Brazilian researchers proved effective in tests involving mice March 8th, 2024

Imaging

Nanoscale CL thermometry with lanthanide-doped heavy-metal oxide in TEM March 8th, 2024

Physics

Nanoscale CL thermometry with lanthanide-doped heavy-metal oxide in TEM March 8th, 2024

Optically trapped quantum droplets of light can bind together to form macroscopic complexes March 8th, 2024

Scientists use heat to create transformations between skyrmions and antiskyrmions January 12th, 2024

Focused ion beam technology: A single tool for a wide range of applications January 12th, 2024

Discoveries

What heat can tell us about battery chemistry: using the Peltier effect to study lithium-ion cells March 8th, 2024

Researchers’ approach may protect quantum computers from attacks March 8th, 2024

High-tech 'paint' could spare patients repeated surgeries March 8th, 2024

Nanoscale CL thermometry with lanthanide-doped heavy-metal oxide in TEM March 8th, 2024

Announcements

What heat can tell us about battery chemistry: using the Peltier effect to study lithium-ion cells March 8th, 2024

Curcumin nanoemulsion is tested for treatment of intestinal inflammation: A formulation developed by Brazilian researchers proved effective in tests involving mice March 8th, 2024

The Access to Advanced Health Institute receives up to $12.7 million to develop novel nanoalum adjuvant formulation for better protection against tuberculosis and pandemic influenza March 8th, 2024

Nanoscale CL thermometry with lanthanide-doped heavy-metal oxide in TEM March 8th, 2024

Interviews/Book Reviews/Essays/Reports/Podcasts/Journals/White papers/Posters

Researchers develop artificial building blocks of life March 8th, 2024

How surface roughness influences the adhesion of soft materials: Research team discovers universal mechanism that leads to adhesion hysteresis in soft materials March 8th, 2024

Curcumin nanoemulsion is tested for treatment of intestinal inflammation: A formulation developed by Brazilian researchers proved effective in tests involving mice March 8th, 2024

Nanoscale CL thermometry with lanthanide-doped heavy-metal oxide in TEM March 8th, 2024

Tools

First direct imaging of small noble gas clusters at room temperature: Novel opportunities in quantum technology and condensed matter physics opened by noble gas atoms confined between graphene layers January 12th, 2024

New laser setup probes metamaterial structures with ultrafast pulses: The technique could speed up the development of acoustic lenses, impact-resistant films, and other futuristic materials November 17th, 2023

Ferroelectrically modulate the Fermi level of graphene oxide to enhance SERS response November 3rd, 2023

The USTC realizes In situ electron paramagnetic resonance spectroscopy using single nanodiamond sensors November 3rd, 2023

NanoNews-Digest
The latest news from around the world, FREE




  Premium Products
NanoNews-Custom
Only the news you want to read!
 Learn More
NanoStrategies
Full-service, expert consulting
 Learn More











ASP
Nanotechnology Now Featured Books




NNN

The Hunger Project