Scientists at the Max Planck Institute (MPI) for Polymer Research have developed the novel 2D TIRV spectroscopy technique to observe coupling between intramolecular and intermolecular vibrations that make water molecules “dance”.
Liquid water is permeated by a highly dynamic network of strong hydrogen bonds. Motions of molecules in this network underlie fundamental physical and chemical phenomena. Chemical processes like proton transfer and physical processes such as energy dissipation are guided by interaction between motions within molecules, and motions between molecules - comparable to an intricate collective molecular “dance”.
Recently, scientists at the Max Planck Institute (MPI) for Polymer Research in Mainz, Germany, have provided fundamental mechanistic insight into this coupling of internal and external molecular motions in water using a novel spectroscopy technique. They have developed the so-called two-dimensional, ultra-broadband terahertz-infrared-visible (2D TIRV) spectroscopy.
“We have combined infrared pulses with ultra-broadband terahertz pulses to develop this two-dimensional spectroscopy. This enables us to measure how the internal motion of a water molecule is directly coupled to the motions of the surrounding hydrogen-bonded network”, said Dr. Maksim Grechko, Group Leader at the MPI for Polymer Research.
Vibrational coupling clarified
By combining the experimental results provided by the 2D TIRV spectroscopy with cutting-edge molecular dynamics calculations Grechko and his co-workers have clarified the nature of the coupling between the intermolecular and intramolecular coordinates in the ensemble of water molecules.
They have found that change in the length of the bond between oxygen and hydrogen in a water molecule is directly coupled to two types of mutual motion of nearby water molecules. The first type of such intermolecular motions is associated with a change of the length of the hydrogen bonds connecting the molecules. And the second type is a complex umbrella-like motion of few water molecules together.
Significance of 2D TIRV spectroscopy for the future
These new results obtained by scientists at the MPI for Polymer Research are very important. Water is ubiquitous. It is the most common solvent and part of many chemical reactions in nature as well as, e.g. in industry. Water provides a unique environment for reactivity of dissolved chemical and biological molecules.
Professor Mischa Bonn, Director at the Max Planck Institute for Polymer Research and head of its Molecular Spectroscopy department, emphasized: „The newly developed 2D TIRV spectroscopy technique provides an exciting opportunity to gain new insights into the coupling between motions inside a molecule and collective motion of their molecule ensemble. We expect many new and stimulating discoveries from this spectroscopy in the future. ”
This novel spectroscopy technique can be used to reveal the heterogeneity and homogeneity of water near ions, osmolytes, and biomolecules such as proteins. Therefore, Grechko and his team continue their scientific work and technical development for further investigations into the structure and dynamic of water molecules.
Maksim Grechko, Taisuke Hasegawa, Francesco D’Angelo, Hironobu Ito, Dmitry Turchinovich, Yuki Nagata, Mischa Bonn: Coupling between intra- and intermolecular motions in liquid water revealed by two-dimensional terahertz-infrared-visible spectroscopy.
Nature Communications, Volume 9, Article number: 885 (2018)
About the Max Planck Institute for Polymer Research:
The Max Planck Institute for Polymer Research (MPI-P) ranks among the globally leading research centers in the field of polymer research since its foundation in 1984. The focus on soft materials and macromolecular materials has resulted in the worldwide unique position of the MPI-P and its research focus. Fundamental polymers research on both production and characterization as well as analysis of physical and chemical properties are conducted by scientific collaborators from all over the world. Presently over 500 people are working at the MPI-P, the vast majority of whom are engaged in scientific research.
Kerstin Felix | Max-Planck-Institut für Polymerforschung
New contents: Neuronal Parkinson inclusions are different than expected
26.06.2019 | Universität Basel
An ion channel with a doorkeeper: The pH of calcium ions controls ion channel opening
25.06.2019 | Johannes Gutenberg-Universität Mainz
From June 25th to 27th 2019, the Fraunhofer Institute for Digital Media Technology IDMT in Ilmenau (Germany) will be presenting a new solution for acoustic quality inspection allowing contact-free, non-destructive testing of manufactured parts and components. The method which has reached Technology Readiness Level 6 already, is currently being successfully tested in practical use together with a number of industrial partners.
Reducing machine downtime, manufacturing defects, and excessive scrap
The quality of additively manufactured components depends not only on the manufacturing process, but also on the inline process control. The process control ensures a reliable coating process because it detects deviations from the target geometry immediately. At LASER World of PHOTONICS 2019, the Fraunhofer Institute for Laser Technology ILT will be demonstrating how well bi-directional sensor technology can already be used for Laser Material Deposition (LMD) in combination with commercial optics at booth A2.431.
Fraunhofer ILT has been developing optical sensor technology specifically for production measurement technology for around 10 years. In particular, its »bd-1«...
The well-known representation of chemical elements is just one example of how objects can be arranged and classified
The periodic table of elements that most chemistry books depict is only one special case. This tabular overview of the chemical elements, which goes back to...
Light can be used not only to measure materials’ properties, but also to change them. Especially interesting are those cases in which the function of a material can be modified, such as its ability to conduct electricity or to store information in its magnetic state. A team led by Andrea Cavalleri from the Max Planck Institute for the Structure and Dynamics of Matter in Hamburg used terahertz frequency light pulses to transform a non-ferroelectric material into a ferroelectric one.
Ferroelectricity is a state in which the constituent lattice “looks” in one specific direction, forming a macroscopic electrical polarisation. The ability to...
Researchers at TU Graz calculate the most accurate gravity field determination of the Earth using 1.16 billion satellite measurements. This yields valuable knowledge for climate research.
The Earth’s gravity fluctuates from place to place. Geodesists use this phenomenon to observe geodynamic and climatological processes. Using...
24.06.2019 | Event News
29.04.2019 | Event News
17.04.2019 | Event News
26.06.2019 | Materials Sciences
26.06.2019 | Physics and Astronomy
26.06.2019 | Health and Medicine