Technetium Tetrachloride Revisited: A Precursor to Lower-Valent Binary Technetium Chlorides

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• 作者：Erik V. Johnstone ; Frederic Poineau ; Paul M. Forster ; Longzou Ma ; Thomas Hartmann ; Andrew Cornelius ; Daniel Antonio ; Alfred P. Sattelberger ; Kenneth R. Czerwinski
• 刊名：Inorganic Chemistry
• 出版年：2012
• 出版时间：August 6, 2012
• 年：2012
• 卷：51
• 期：15
• 页码：8462-8467
• 全文大小：378K
• 年卷期：v.51,no.15(August 6, 2012)
• ISSN：1520-510X

文摘

Technetium tetrachloride has been prepared from the reaction of technetium metal with excess chlorine in sealed Pyrex ampules at elevated temperatures. The product was characterized by single-crystal and powder X-ray diffraction, transmission electron microscopy, scanning electron microscopy, and alternating-current magnetic susceptibility. Solid TcCl₄ behaves as a simple paramagnet from room temperature down to 50 K with 渭_eff = 3.76 渭_B. Below 25 K, TcCl₄ exhibits an antiferromagnetic transition with a N茅el temperature (T_N) of 24 K. The thermal behavior of TcCl₄ was investigated under vacuum at 450 掳C; the compound decomposes stepwise to 伪-TcCl₃ and TcCl₂.