X-ray crystal structures and solution dynamics of sodium organofluorotitanates [Na{Ti2(C5Me5)2F7}] and [NaTi6(C5Me5)5F20(H2O)]·(THF)

[Na{Ti2(C5Me5)2F7}], a polymer with sodium fluoride motif, is soluble in acetonitrile thereby producing a species with sodium ion coordinated by [Ti2(C5Me5)2F7]− anion, which is a sensitive 19F NMR probe for sodium ion coordination.