Volume 63, Issue 24 e202405314
Research Article

Water-Ice Microstructures and Hydration States of Acridinium Iodide Studied by Phosphorescence Spectroscopy

Hongping Liu

Hongping Liu

Hefei National Research Center for Physical Sciences at the Microscale, University of Science and Technology of China, Hefei, 230026 China

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Hao Su

Hao Su

Hefei National Laboratory, Hefei, 230088 China

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Ning Chen

Ning Chen

Hefei National Research Center for Physical Sciences at the Microscale, University of Science and Technology of China, Hefei, 230026 China

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Jie Cen

Jie Cen

Key Laboratory of Precision and Intelligent Chemistry, University of Science and Technology of China, Hefei, 230026 China

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Jiajia Tan

Jiajia Tan

Key Laboratory of Precision and Intelligent Chemistry, University of Science and Technology of China, Hefei, 230026 China

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Baicheng Zhang

Baicheng Zhang

Hefei National Laboratory, Hefei, 230088 China

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Xiaoyu Chen

Xiaoyu Chen

Hefei National Research Center for Physical Sciences at the Microscale, University of Science and Technology of China, Hefei, 230026 China

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Aoyuan Cheng

Aoyuan Cheng

Hefei National Laboratory, Hefei, 230088 China

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Shengquan Fu

Shengquan Fu

Hefei National Research Center for Physical Sciences at the Microscale, University of Science and Technology of China, Hefei, 230026 China

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Prof. Xiaoguo Zhou

Corresponding Author

Prof. Xiaoguo Zhou

Hefei National Research Center for Physical Sciences at the Microscale, University of Science and Technology of China, Hefei, 230026 China

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Prof. Shilin Liu

Prof. Shilin Liu

Hefei National Research Center for Physical Sciences at the Microscale, University of Science and Technology of China, Hefei, 230026 China

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Prof. Xuepeng Zhang

Corresponding Author

Prof. Xuepeng Zhang

Hefei National Research Center for Physical Sciences at the Microscale, University of Science and Technology of China, Hefei, 230026 China

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Prof. Shiyong Liu

Corresponding Author

Prof. Shiyong Liu

Key Laboratory of Precision and Intelligent Chemistry, University of Science and Technology of China, Hefei, 230026 China

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Prof. Yi Luo

Prof. Yi Luo

Hefei National Research Center for Physical Sciences at the Microscale, University of Science and Technology of China, Hefei, 230026 China

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Prof. Guoqing Zhang

Corresponding Author

Prof. Guoqing Zhang

Hefei National Research Center for Physical Sciences at the Microscale, University of Science and Technology of China, Hefei, 230026 China

Hefei National Laboratory, Hefei, 230088 China

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First published: 11 April 2024
Citations: 2

Graphical Abstract

Phosphorescence spectroscopy was utilized to visualize the microstructure transition of water at varying temperatures from 298 K to 77 K at a probe concentration of ~10−5 M, showing higher sensitivity by at least two orders of magnitude than absorption-base techniques. By this unique means, it was found that a trace amount (as low as 10−5 M) of organic hydrophiles could thoroughly prevent the crystallization of water ice at freezing temperatures.

Abstract

Ice has been suggested to have played a significant role in the origin of life partly owing to its ability to concentrate organic molecules and promote reaction efficiency. However, the techniques for studying organic molecules in ice are absorption-based, which limits the sensitivity of measurements. Here we introduce an emission-based method to study organic molecules in water ice: the phosphorescence displays high sensitivity depending on the hydration state of an organic salt probe, acridinium iodide (ADI). The designed ADI aqueous system exhibits phosphorescence that can be severely perturbed when the temperature is higher than 110 K at a concentration of the order of 10−5M, indicating changes in hydration for ADI. Using the ADI phosphorescent probe, it is found that the microstructures of water ice, i.e., crystalline vs. glassy, can be strongly dictated by a trace amount (as low as 10−5M) of water-soluble organic molecules. Consistent with cryoSEM images and temperature-dependent Raman spectral data, the ADI is dehydrated in more crystalline ice and hydrated in more glassy ice. The current investigation serves as a starting point for using more sensitive spectroscopic techniques for studying water-organics interactions at a much lower concentration and wider temperature range.

Conflict of interests

The authors declare no conflict of interest.

Data Availability Statement

The data that support the findings of this study are available from the corresponding author upon reasonable request.

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