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Date: 6-1-2019
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Oxofluorides
Oxofluorides are known for Xe(IV), Xe(VI) and Xe(VIII): XeOF2, XeOF4 , XeO2F2, XeO2F4 and XeO3F2. Their structures are consistent with VSEPR theory. The 1:1 reaction of XeF4 and H2O in liquid HF yields XeOF2, isolated as a pale yellow solid which decomposes explosively at 273K. In contrast to reaction 17.5, partial hydrolysis of XeF6 (equation 1.1) gives XeOF4 (a colourless liquid, mp 227 K), which can be converted to XeO2F2 by reaction 1.2. Reaction 1.3 is used to prepare XeO3F2 which can be separated in vacuo; further reaction between XeO3F2 and XeF6 yields XeO2F4.
(1.1)
(1.2)
(1.3)
The stable salts M[XeO3F] (M = K or Cs) are obtained from MF and XeO3, and contain infinite chain anions with F- ions bridging XeO3 groups. Similar complexes are obtained from CsCl or RbCl with XeO3 but these contain linked [XeO3Cl2]2- anions as shown in 1.1.
(1.1)
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دراسة يابانية لتقليل مخاطر أمراض المواليد منخفضي الوزن
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اكتشاف أكبر مرجان في العالم قبالة سواحل جزر سليمان
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اتحاد كليات الطب الملكية البريطانية يشيد بالمستوى العلمي لطلبة جامعة العميد وبيئتها التعليمية
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