Two new cadmium acetate compounds, Cd(tpy)(Ac)₂·2H₂O (1) and Cd₂(bbip)₂(Ac)₃·0.5S₂O₈·2H₂O (2) (tpy = 2,2′,2″-terpyridine; bbip = 2,6-bis(benzimidazol-2-yl)pyridine; Ac = acetate), have been synthesized and their crystal structures determined. Compound 1 is monoclinic, P 2(1)/ n , a = 8.4899(11), b = 23.169(3), c = 10.9224(14)Å, β = 7.493(2)°, V = 2049.1(5)ų, Z = 4, R = 0.037 for 4552 N_i independent reflections and for 1619 N_o observed [ I > 2σ(I) ] reflections. Compound 1 is monomeric, with a heptacoordinate cadmium ion bonded to two bidentate acetate groups and a tridentate tpy; two hydration water molecules complete the formula unit. Compound 2 is triclinic, a = 10.8412(7), b = 14.4051(9), c = 15.5354(10)Å, α = 82.889(1), β = 77.953(1), γ = 85.805(1)°, V = 2351.73(3)ų, Z = 2, R = 0.044, N_i = 9014, N_o = 6837. The binuclear structure has two independent Cd atoms per asymmetric unit, two bbip tridentate ligands (one attached to each cation) and three acetate groups, displaying a range of different coordination features.