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Single crystals of enH 2 MnF 5  (en = ethylenediamine) have been prepared from aqueous HF solution and the crystal structure was determined by X-ray diffraction: space group Cccm, Z = 16, a = 1710.5(4), b = 1799.2(4), c = 847.8(2) pm, R/wR = 0.040/0.028 for 977 reflections. The structure consists of kinked [MnF 5]2- - chains built by MnF 6  octahedra sharing trans vertices (angles Mn-F-Mn 161.2 and 157.8°). The bridging Mn-F ax  bonds are strongly elongated by the Jahn-Teller effect (mean Mn-F ax  215.4, Mn-F 183.8 pm). Each of the enH 2  2+  cations is connected to four anionic chains by hydrogen bonds forming a 3 D network. Thermal decomposition occurs between 200 and 380 °C in two steps giving finally MnF 2 . The IR spectra of enH 2 MnF 5  and its decomposition products are reported.

zeitschrift für naturforschung b

Kristallstruktur, thermische Zersetzung und Schwingungsspektrum von Ethylendiammonium-pentafluoromanganat(III), enH 2 MnF 5  / Crystal Structure, Thermal Decomposition and Vibrational Spectrum of Ethylenediammonium-pentafluoromanganate(III), enH 2 MnF 5