A novel molecular solid, [OFBzIQl][Ni(mnt) 2 ] (1), where [OFBzIQl] + =1-(2′-fluorobenzyl)isoquinolinium and mnt 2− =maleonitriledithiolate, forms 1D column of alternating between cations and anions via π⋯π stacking interaction between Ni(mnt) 2 plane and isoquinoline ring, and the Ni(mnt) 2 anions between the adjacent columns exist short C⋯N interaction. The extensive hydrogen bonds between anions and cations in the crystal generate a 2D network structure. Magnetic susceptibility measurement for 1 in the temperature range 2.0–300K shows that 1 exhibits a magnetic constant transition from ferromagnetic to antiferromagnetic around 35K as the temperature is lowered.