The title compound, [Cu2(CH3COO)4(C8H10N2)]n·nCH3CN 1 (C8H10N2, 4,4-bipy = 4,4-bipyridine), has been solvothermally synthesized in CH3CN and characterized by X-ray diffraction. The crystal is of monoclinic, space group Cc with a = 22.626(6), b = 14.012(4), c = 15.106(4) ?, β = 107.610(3)o, V = 4565(2) 3, C20H23Cu2N3O8, Mr = 560.49, Z = 8, Dc = 1.631 g/cm3, μ = 1.914 mm-1, Flack parameter = 0.48(1), F(000) = 2288, R = 0.042 and wR = 0.098 for 8887 observed reflections (I > 2σ(I)). It consists of nearly linear one-dimensional chains [Cu2(CH3COO)4(C8H10N2)]n derived from paddle-wheel [Cu2(CH3COO)4] unit linked by 4,4?-bipy, and CH3CN as guest molecule regularly decorates between the chains.