In the title compound, [Ni(C3H7NO)(6)](BF4)(2), there are two independ
ent [Ni(dmf)(6)](2+) cations (dmf is N,N-dimethylformamide), each with
a crystallographically imposed centre of symmetry. Hydrogen-bonding i
nteractions between the cations and BF4- anions allow the formation of
polymeric chains.