Abstract
In the system chromium(V) fluoride — xenon(II) fluoride besides of already known XeF 2·2CrF 4 [1] also a new blue xenon(II) fluorochromate(IV) was isolated by the reaction: CrF 5 + nXeF 2 → XeF 2·CrF 4 + 1 2 XeF 4 + (n−1.5)XeF 2. This compound was obtained also by the reaction: CrF 4 + nXeF 2 → XeF 2·CrF 4 + (n−1)XeF 2. Xenon difluoride is not able to oxidize chromium above 3+ oxidation state. Brick red XeF 6·CrF 4 [2] was isolated in the system chromium fluorides (CrF x with x being 2, 3, 4, 5) — xenon hexafluoride. It is observed that CrF 5 is reduced to 4+ oxidation state even in oxidative environmnet of xenon hexafluoride. Although considered as a relatively strong Lewis acid, CrF 5 is not strong enough to form its XeF 5 + salt. From vibrational spectra it could be concluded that XeF 2·CrF 4 is XeF + salt and XeF 6·CrF 4 is XeF 5 + salt. The anionic parts of both spectra are similar. In the system chromium fluorides-krypton difluoride only chromium pentafluoride is obtained. A new method [3] designed for the preparation of polymeric in AHF insoluble binary fluorides was used for the preparation of CrF 4. Its magnetic measurements indicate strong interactions between chromium atoms.
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