Dimers of Ag2+ Ions – Synthesis and Characterization of the Quaternary Silver Fluoride Ag2ZnZr2F14 with [Ag2F7]3– Units
作者： Jianwei Tong , Florian Kraus , Jürgen Köhler , Arndt Simon , Jia Liu
关键词: Crystallography 、 Magnetic susceptibility 、 Chemistry 、 Fluorine 、 Silver fluoride 、 Powder diffraction 、 Dimer 、 Crystal structure 、 Characterization (materials science) 、 Ion
摘要: Deep blue-violet colored powder samples of Ag2ZnZr2F14 were synthesized by heating Zn(NO3)2·4H2O, Ag and ZrOCl2·8H2O at 300 °C under fluorine atmosphere. The crystal structure was refined from X-ray diffraction data using the Rietveld method (C2/m, a = 9.0206(1) A, b 6.6373(1) A, c 9.0563(1) A, β 90.44(1)°, Z 2). is derived isotypic Ag3Zr2F14 replacing only one two crystallographically different Ag2+ ions with Zn2+ ions, thus leading to discrete Ag2F7 dimers. These dimers are connected via nearly linear Ag–F···F–Ag bridges short F···F distances 2.33 A form two-legged ladders. Magnetic susceptibility measurements density functional calculations show that in each dimer strongly coupled antiferromagnetically.
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