A [FeIII(Tp)(CN)3]- scorpionate-based complex as a building block for designing ion storage hosts (Tp: hydrotrispyrazolylborate).

Using a scorpionate-based complex, [FeIII(Tp)(CN)3]-, as a building block, a new cyanide-based molecular material [{FeIII(Tp)(CN)3}2NiII(H2O)2]·4H2O (1), which can be viewed as a lower dimensional model of Prussian blue analogues, was investigated as a lithium-ion storage host.