Researchers uncover how the halogen bond can be exploited to direct sequential dynamics in the multi-functional crystals, offering crucial insights for developing ultrafast-response times for multilevel optical storage.
Researchers uncover how the halogen bond can be exploited to direct sequential dynamics in the multi-functional crystals, offering crucial insights for developing ultrafast-response times for multilevel optical storage.
Halogen bonds are intermolecular interactions that arise from the attraction between a halogen atom and another atom with lone pairs, more generally a molecular entity with high electron density. Understanding the distinctive and highly directional nature of halogen bonds is crucial for crystal engineering and studying photoinduced structural deformations, which is key for the development of innovative photo-functional materials. However, the influence of halogen bonds on the rapid photoinduced changes within supramolecular systems remains largely unexplored due to a lack of experimental techniques that can directly observe the halogen bond in action. To solve this problem, a team of researchers, led by Assistant Professor Tadahiko Ishikawa from the Department of Chemistry at the School of Science at Tokyo Institute of Technology , Associate Professor Kazuyuki Takahashi affiliated with Kobe University, Dr. Yifeng Jiang affiliated with the European X-Ray Free-Electron Laser Facility , and Professor R. J. Dwayne Miller affiliated with University of Toronto, explored the photoinduced dynamics associated with the halogen bonds of the prototypical halogen-bonded multifunctional system [FeO on the ultrafast timescale, triggered by change in electron spin or spin crossover mechanics. The study, which is a collaborative research project involving Tokyo Tech, EuXFEL, University of Potsdam, University of Toronto, University of Tsukuba, and Kobe University, has been detailed in the journalSCO is a phenomenon observed in some transition-metal coordination complexes, wherein a spin transition between low-spin and high-spin states is triggered through changes in temperature, pressure, or light. SCO accompanies relatively large volume changes and can be controlled by photoinducing different responses in the multifunctional crystals. [FeO is a typical example of such multifunctional crystals, which exhibits both thermally- and photo-induced SCO-related phase transitions. In this system, [Fecations leads to a phase transition between low-temperature and high-temperature phases in our target material due to intermolecular interactions," explains Ishikawa."The LT phase exhibits LS state of the [Feanions, while the HT phase exhibits HS state cations and weak dimerization of anions. The question is how does the halogen bond direct electron density and spin changes to impact functions as part of undergoing these phase transitions. Can we control the phase and material properties?"anions by combining three methods: time-resolved transient visible absorption spectroscopy, time-resolved mid-infrared reflectivity spectroscopy, and ultrafast electron diffraction to study the dynamics from different viewpoints, covering electronic, vibrational, and structural aspects of the system. This comprehensive approach allowed for a thorough investigation of the photoinduced change of the states, providing a deeper understanding of the underlying processes and intermediates involved. They discovered the existence of a photoinduced transient intermediate state different from the LT and HT phases, characterized by the HS state of [Feanions. This TIS state is achieved in the ultrafast timescale, within a few picoseconds, while the final state, similar to the HT phase, is achieved through sequential slow dynamics over approximately 50 picoseconds. Furthermore, to elucidate the role of the halogen bonds in the above-mentioned photoinduced sequential dynamics, the researchers conducted quantum chemistry calculations using the ultrafast electron diffraction results. Their analysis revealed the persistence of halogen bonds between the cation and the anion guiding the sequential dynamics. Photoexcitation of the [Feanions through vibrational energy transfer via halogen bonds. In addition, the rapid expansion of the SCO ligand shell builds strain on the nearest [NiOverall, the present results underscore the importance of halogen bonds in the photoinduced dynamics, offering a better understanding of the synergistic spin transition."Our study highlights the importance of ultrafast investigations in monitoring ultrafast electronic and structural dynamics," remarks Jiang."Overall, our study highlights the potential for utilizing halogen bonds for fine-tuned functional control in photo-active supramolecular systems, with applications in fast multilevel optical data storage."Yifeng Jiang, Stuart Hayes, Simon Bittmann, Antoine Sarracini, Lai Chung Liu, Henrike M. Müller-Werkmeister, Atsuhiro Miyawaki, Masaki Hada, Shinnosuke Nakano, Ryoya Takahashi, Samiran Banu, Shin-ya Koshihara, Kazuyuki Takahashi, Tadahiko Ishikawa, R. J. Dwayne Miller.Ultrafast laser physicists from the attoworld team have gained new insights into the dynamics of electrons in solids immediately after ... The future development of functional magnetic devices based on ultrafast optical manipulation of spins requires an understanding of the depth-dependent spin dynamics across the interfaces of complex ... Ultrafast light-driven control of magnetization on the nanometer length scale is key to achieve competitive bit sizes in next generation data storage technology. Researchers have successfully ... Current 3D printed microfluidics are limited by multiple factors, such as available materials for 3D printing , achievable dimensions of ...A New Way of Designing Auxetic Materials
Materials Science Physics Engineering And Construction Nature Of Water Chemistry Inorganic Chemistry Organic Chemistry
United States Latest News, United States Headlines
Similar News:You can also read news stories similar to this one that we have collected from other news sources.
Researchers achieve ultra-high-Q free space coupling to microtoroid resonatorsScientists from the University of Arizona have achieved far-field coupling of light to ultra-high quality factor microtoroids using a single objective lens. This could provide the foundation for a fully on-chip multiplexed microtoroid sensing platform.
Read more »
Observing mammalian cells with superfast soft X-raysResearchers have developed a new technique to view living mammalian cells. The team used a powerful laser, called a soft X-ray free electron laser, to emit ultrafast pulses of illumination at the speed of femtoseconds, or quadrillionths of a second.
Read more »
Observing mammalian cells with superfast soft X-raysResearchers have developed a new technique to view living mammalian cells. The team used a powerful laser, called a soft X-ray free electron laser, to emit ultrafast pulses of illumination at the speed of femtoseconds, or quadrillionths of a second.
Read more »
Watch SpaceX send Earth-observing satellite to orbit today on 2nd leg of doubleheaderElizabeth Howell (she/her), Ph.D., is a staff writer in the spaceflight channel since 2022 covering diversity, education and gaming as well. She was contributing writer for Space.com for 10 years before joining full-time.
Read more »
Scientists develop most sensitive method yet for observing single moleculesScientists at the University of Wisconsin–Madison have developed the most sensitive method yet for detecting and profiling a single molecule—unlocking a new tool that holds potential for better understanding how the building blocks of matter interact with each other.
Read more »
Observing ultrafast photoinduced dynamics in a halogen-bonded supramolecular systemResearchers have uncovered how the halogen bond can be exploited to direct sequential dynamics in multi-functional crystals, offering crucial insights for developing ultrafast-response times for multilevel optical storage.
Read more »