Synthesis and investigation of a new coordination compound: Ammonium octafluoridoindate-zirconate heptahydrate NH4InZrF8·7H2O

The synthesis and complex study (single crystal X-ray diffraction, thermogravimetry, IR- and NMR-spectroscopy) of a new coordination compound NH4InZrF8·7H2O and the products of its thermal destruction NH4InZrF8·H2O and NH4InZrF8 have been performed. The compound of NH4InZrF8·7H2O are characterized with a new type of chain structure [ZrF8In(H2O)4]1−∞1. According to 19F MAS NMR, dehydration of the compound NH4InZrF8·7H2O results in restructuring with formation of the complex anion of the compound NH4InZrF8·H2O containing the fragment FtInFt (terminal fluorine atoms - Ft). The anhydrous compound and the monohydrate are characterized with the ability of reverse water absorption from air.