New progress has been made in the cooperative research on ion clustering in the aqueous solution of Dalian Institute of Chemical Physics, Chinese Academy of Sciences
Recently, the research team of Zhuang Wei from the Dalian Institute of Chemical Physics, Chinese Academy of Sciences and Professor Zheng Junrong (a senior partner researcher of Dalian Institute of Chemical Physics) of Rice University in the United States have made new progress in the research of ion clusters in aqueous solutions.
Although the scientific community has made long-term efforts to solve the structure of ionic hydration in water, many unknown problems still exist, especially the existence and structure of ionic clusters in 1: 1 strong electrolyte aqueous solution. The transition metal salts are dissolved in water, and it is generally believed that there will be a certain amount of counter ions to maintain coordination. In comparison, alkali metal ions do not follow this path. Traditionally, when such salts are dissolved, a large number of water molecules completely separate anions and cations. However, this precise two-dimensional spectroscopy study by Zheng Junrong and Zhuang Wei uncovered the more complex dissolution scenarios of simple salts, and the anions and cations still affect each other in the solution. Studies have shown that concentrated solutions of alkali cyanate exhibit anionic clustering.
Zheng Junrong, Zhuang Wei and others used two-dimensional infrared spectroscopy combined with pumps / probes, and used anisotropic light and heavy cyanate as probes to probe the surrounding energy transfer. The fitting with the kinematics equation revealed that Ion clustering of LiSCN, NaSCN, KSCN and CsSCN in aqueous solution. The results show that, in a near-saturated KSCN aqueous solution (water / KSCN molar ratio = 2.4 / 1), 95% of anions form ionic clusters. The rotational anisotropy measurement results show that the scale of the ion cluster is close to 18 anions, and the experimental results are in good agreement with the molecular dynamics theoretical simulation results. When diluting the solution or switching to smaller alkali metal ions (sodium or lithium), the proportion of anions detected in the ionic clusters decreases; cesium as the largest stable alkali metal, correspondingly obtains the highest cluster ratio. This vibration energy transfer method makes it possible to study a wide variety of other fast and short-range molecular interactions.
Related research results have been published in the Proceedings of the National Academy of Sciences (PNAS). In this article, Zheng Junrong serves as the corresponding author, the US side undertakes all the experimental work, and Dalian Institute of Chemical Engineering undertakes all the theoretical work. This work has been reported by Science magazine highlight (SCIENCE VOL 331 PAGE 1494/25 MARCH 2011), and the follow-up research work is in progress.
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