Inorganic Chemistry, Vol.55, No.5, 2488-2498, 2016
Trigonal-Bipyramidal Coordination in First Ammoniates of ZnF2: ZnF2(NH3)(3) and ZnF2(NH3)(2)
Single crystals of ZnF2(NH3)(3) and ZnF2(NH3)(2) were obtained under ammonothermal conditions (250 degrees C, 196 MPa and 500 degrees C, 136 MPa). Upon thermal decomposition of both ZnF2(NH3)(3) and ZnF2(NH3)(2), a microcrystalline powder of ZnF2(NH3) was obtained. ZnF2(NH3)(3) and ZnF2(NH3)(2) represent probable intermediates in a conceivable ammonothermal synthesis of the semiconductor Zn3N2 and manifest a rare trigonal-bipyramidal coordination of F- and NH3 ligands around Zn2+ according to single-crystal X-ray diffraction. Thermal analysis of all three compounds showed not only ZnF2(NH3) but also ZnF2(NH3)(2) to be decomposition intermediates of ZnF2(NH3)(3) prior to the formation of ZnF2. All three compounds demonstrate hydrogen bonds, as indicated by the intensities and half-widths of the bands in the vibrational spectra and by short N-H center dot center dot center dot F distances in the crystal structures of ZnF2(NH3)(3) and ZnF2(NH3)(2). With ZnF2(NH3)(3), ZnF2(NH3)(2), and ZnF2(NH3), we present the first ammoniates of ZnF2.