Abstract
Distinctive terahertz (THz) absorption spectra of ninhydrin and indane-1,2,3-trione ranging from 0.5 to 4.5 THz were observed firstly in our experiment by terahertz time-domain spectroscopy (THz-TDS). The dehydration process of ninhydrin was also monitored online. The experimental results indicate that THz spectroscopy is highly sensitive to the crystal structure, weak intermolecular interactions, and the environmental change. Multitechniques including differential scanning calorimetry (DSC) and powder X-ray diffraction (PXRD) were also carried out to further investigate ninhydrin and indane-1,2,3-trione. And the results support the reliability of THz spectroscopy. Density functional theory (DFT) calculations based on the samples’ crystalline structures were performed for better understanding the THz characteristic spectra. The calculations agree with the experimental observation, and the corresponding vibrational modes of ninhydrin and indane-1,2,3-trione are assigned.
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Acknowledgements
This work was supported by the Main Direction Program of Knowledge Innovation and Open Project Program of Key Laboratory of Interfacial Physics and Technology, Chinese Academy of Sciences, the National Science Foundation No. 10574134, and the National Basic Research Program of China No. 2014CB339806.
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Zou, T., Li, S., Pan, T. et al. Terahertz Spectra of Ninhydrin and Indane-1,2,3-Trione. J Infrared Milli Terahz Waves 38, 896–908 (2017). https://doi.org/10.1007/s10762-017-0376-z
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DOI: https://doi.org/10.1007/s10762-017-0376-z