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Experimental and periodic DFT studies of the structural and vibrational (infrared and Raman) properties of two alkylenediammonium hexafluorosilicate compounds, NH3(CH2)4NH3SiF6 (1) and NH3(CH2)6NH3SiF6 (2), have been performed in crystal phase, where three-dimensional NH⋯F hydrogen bonds (HB) network was formed. The analysis of the vibrational spectra was supported by factor group analysis, periodic...