The (n-Bu4N)2[Fe(dcbdt)2]2 complex, where 4,5-dicyanobenzene-1,2-dithiolate (dcbdt), was prepared and characterised by X-ray diffraction, Mössbauer spectroscopy and magnetisation measurements. The crystal structure as determined by single crystal X-ray diffraction is triclinic, space group P1̄ with cell parameters a=9.5660(1) Å, b=13.0200(2) Å, c=16.0850(2) Å, α=67.554°(1), β=86.797°(1), γ=70.523°(1), V=1738.77(4) Å3 and it consists in strongly dimerised [Fe(dcbdt)2]− units, which are stacked side by side as chains along a. The magnetic susceptibility shows that the [Fe(dcbdt)2]− units have a low spin S=1/2 configuration and, besides a strong intradimer antiferromagnetic interaction, present also a significant interdimer antiferromagnetic interaction mediated by short side contacts.