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二氧化氙

二氧化氙
IUPAC名
Xenon dioxide
识别
CAS号 15792-90-2  checkY
性质
化学式 XeO2
摩尔质量 163.28 g·mol⁻¹
结构
分子构型 平面正方形
相关物质
相关化学品 三氧化氙
四氧化氙
若非注明,所有数据均出自标准状态(25 ℃,100 kPa)下。

二氧化氙是一种由形成的无机化合物,化学式为XeO2,它于2011年首次合成。制备方法是在0 °C时使四氟化氙与2 mol/L的稀硫酸发生水解反应。[1]

结构

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它具有无限延伸的链状或网状结构,其中氙和氧的配位数分别是4和2。它的空间构型是平面正方形,与价层电子对互斥理论关于4对成键电子和2对孤对电子的分子的预测相符(即VSEPR理论中的AX4E2符号)。

在真正合成该化合物的十多年前,就有理论计算说明了该物质能够存在。但他们认为该物质是以单分子而非聚合物形式存在的。[2]

性质

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二氧化氙是一种橙黄色固体。[3]它是一种不稳定的化合物,迅速歧化成三氧化氙和氙气,此反应半衰期仅有大约两分钟。它的结构可以在-78°C下通过拉曼光谱测定,以防止在获取光谱数据前样品就已分解。[4]

参考资料

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  1. ^ Brock, David S.; Schrobilgen, Gary J. Synthesis of the Missing Oxide of Xenon, XeO2, and Its Implications for Earth’s Missing Xenon. Journal of the American Chemical Society. 2011, 133 (16): 6265–6269. PMID 21341650. doi:10.1021/ja110618g. 
  2. ^ Pyykkö, Pekka; Tamm; Toomas. Calculations for XeOn(n = 2−4): Could the Xenon Dioxide Molecule Exist?. The Journal of Physical Chemistry A. 1 April 2000, 104 (16): 3826–3828. doi:10.1021/jp994038d. 
  3. ^ Simon Cotton. Soundbite Molecules. Royal Society of Chemistry. May 2011 [2012-05-18]. (原始内容存档于2011-11-23). 
  4. ^ Tyler Irving. Xenon Dioxide May Solve One of Earth's Mysteries. L’Actualité chimique canadienne (Canadian Chemical News). May 2011 [2012-05-18]. (原始内容存档于2013-02-09). 
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二氧化氙
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