Pressure-Induced Reverse Reaction of the Photochemical Decomposition of Germanium Tetraiodide Molecular Crystal

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• 作者：Yuhang Deng ; Zhilei Sui ; Junbo Gong ; Rucheng Dai ; Zhongping Wang ; Zengming Zhang ; Zejun Ding
• 刊名：Journal of Physical Chemistry C
• 出版年：2013
• 出版时间：November 27, 2013
• 年：2013
• 卷：117
• 期：47
• 页码：25012-25018
• 全文大小：469K
• 年卷期：v.117,no.47(November 27, 2013)
• ISSN：1932-7455

文摘

GeI₄ molecular crystal and its solution in cyclohexane were irradiated by lasers of different wavelengths to investigate the critical wavelength for photochemical decomposition of GeI₄. We have observed that 633 nm laser can photochemically decompose GeI₄, exceeding the previously reported wavelength limit of 514 nm. XPS spectra indicate that GeI₄ is photochemically decomposed into Ge₂I₆ and I₂; unlike GeBr₄, Ge²⁺ (GeI₂) cannot be found in the photochemical reaction products. Raman spectra measurement of GeI₄ under high pressure up to 24 GPa show that Raman signals of Ge₂I₆ and I₂ vanish at 0.5 to 1.7 GPa. This finding clearly shows that high pressure can effectively reverse the photochemical decomposition of GeI₄ and influence the direction of the solid-state reaction, which is usually found on gas-phase reactions.