The reaction of N‘-[1-(pyridine-2-yl)ethylidene]acetohydrazide (L) with Cu(ClO₄)₂·6H₂O in the presence of sodium dicyanamide affords an end-to-end one-dimensional coordination polymer, [CuL(μ_1,3-N(CN)₂]·ClO₄, whose X-ray structure shows that the Cu^|| is bound by an N,N,O chelator and is bridged to two neighbouring metal centres by N(CN)₂^-, generating a 1-D coordination chain. The Cu^|| atom adopts a distorted square pyramidal geometry. Variable temperature magnetic susceptibility measurements demonstrate weak antiferromagnetic interactions with J value −0.09 cm⁻¹.