2023 Qingdao University of Science and Technology Analysis and Testing Center Paramagnetic Technology Exchange Meeting Successfully Held

On October 28th, 2023 Qingdao University of Science and Technology Sub-measurement Center Paramagnetic Technology Meeting and CIQTEK User Training Meeting was successfully held. More than 50 experts and scholars from Qingdao University of Science and Technology, Shandong University, China University of Petroleum, Shandong University of Science and Technology, Qingdao University, Shandong University of Science and Technology, Yantai University, Liaocheng University, and other universities and research institutes in Shandong Province gathered together to have an in-depth discussion on the basic theories of Electron Paramagnetic Resonance(EPR) Spectrometer. They also had a trip to learn about the use of the electron paramagnetic resonance spectrometer in the Analysis and Testing center of Qingdao University of Science and Technology.

At the beginning of the meeting, Ms. Sun Qiong of Qingdao University of Science and Technology expressed her warm welcome to the experts. She briefly introduced the development history and current situation of Qingdao University of Science and Technology (QUST) Analytical Testing Center (ATC), which is directly under the university and was established in June 2020 on the basis of the original analytical testing center of the relevant colleges, with the existing instrumentation assets of about 196 million RMB and more than 200 sets of analytical instruments focusing on the four major service areas of analysis, detection, testing, and research and development. Mr. Sun said that CIQTEK has achieved fruitful results in the field of electron paramagnetic resonance and high-end scientific instruments, and has built a good communication platform for users.

     Prof. Zhu Fanping from Shandong University shared his experience on "Analysis of Common Problems in EPR Testing". The report covered the definition and setting principles of relevant parameters in the EPR testing process, and provided the participating scholars with experience in solving problems frequently encountered during the testing process, including the selection of capture agent, the determination of reaction system, and the analysis of results.

     Prof. Jixiang Hu of Qingdao University gave a presentation on "Construction and Performance Regulation of Room Temperature Photoinduced Molecular Magnets". He said that molecular-based magnets have a wide range of applications in high-density information storage, electronic spin devices, etc., and have become a research hotspot at the intersection of many disciplines, including chemistry, physics, and materials. Focusing on the work of light-response modulation in molecular magnets, the researchers synthesized multiple examples of photochromic molecular magnets in organophosphine/carboxylic acid complex systems using an electron donor-acceptor assembly strategy to achieve a tunable change of the light-induced magnetization rate at room temperature. The magnetic bistability (177 K) of a giant thermal hysteresis loop in a radical-driven photochromic material is achieved for the first time by exploiting the change in magnetic coupling between a photogenerated radical and a paramagnetic metal. By introducing anisotropic rare-earth metals to realize the on/off behavior of photo-induced single-molecule magnets and increasing the manipulation temperature above room temperature, a new strategy for the construction of single-molecule magnets using photochromic materials is proposed.

Professor Jinsheng Zhao of Liaocheng University shared the work related to "Research on Conjugated Polymers and Their Application with Carbon Nitride Heterojunction Catalysts for Photocatalytic Hydrogen Generation", in which he pointed out that compared with the benzene-substituted TAPT-COFs, the TTPA-COFs added three extra pyridine nitrogen atoms on the pyridine ring around the triazine unit. Both COFs can be used as photocatalysts with high HPR activity, in which the HPR of TTPA-COF was 6485.05 μmol g^-1h^-1, much higher than that of TAPA-COF (2028.06 μmol g^-1 h^-1). Notably, the AQY value of TTPA-COF reached a higher value of 12.25% at 405 nm. The introduction of additional pyridine nitrogen atoms enhances the off-domain effect of electrons, which prolongs the conjugation length of TTPA-COF, thus increasing the absorption range of TTPA-COF, and also promotes the spatial separation of electrons and holes. The introduction of pyridine atoms slows down the rate of electron/hole pair complexation and also accelerates the carrier migration on the photocatalyst surface. These factors can explain the significantly higher HPR activity of TTPA-COF than that of TAPT-COF. We emphasize the importance of nitrogen atoms in the construction of triazine-based COFs, which provides a way to design efficient HPR photocatalysts.

     After the meeting, the guests visited the Analysis and Testing Center of Qingdao University of Science and Technology.After the meeting, the guests visited the Analysis and Testing Center of Qingdao University of Science and Technology.