Syntheses and solid-state and solution structures of [Ba[(C5Me5)2Ti2F7]2(hmpa)] and [Ba8Ti6F30I2(C5Me5)6(hmpa)6][I3]2

The complexes Ba(C5Me5)2Ti2F7]2(hmpa)].(THF), 1.hmpa.(THF), and Ba8Ti6F30I2(C5Me5)6(hmpa)6]I3]2.10(THF), 2I3]2.10(THF), were prepared from Hdmpy](+)(C5Me5)2Ti2F7]- (dmpy = 2,6-dimethylpyridine), BaI2, and hmpa (hmpa = hexamethylphosphoramide). They were characterized by 1H and 19F NMR and IR spectroscopy and examined by single-crystal X-ray crystallography. The complexation equilibrium of the barium ion in 1 with hmpa and the dynamics of the barium ion moving on the fluorine surfaces of (C5Me5)2Ti2F7]- in 1.hmpa have been studied by variable-temperature 19F NMR spectroscopy. The core of the complex 2I3]2.10(THF) resembles the basic structural unit of the cubic perovskite.