Self-assembly of the rigid rodlike ligand N,N'-4,4'-diphenylethynebis(oxamate) (dpeba) and Cu2+ ions affords a novel dinuclear copper(II) metallacyclophane (nBu(4)N)(4)[Cu-2(dpeba)(2)]center dot 4MeOH center dot 2Et(2)O (1) featuring a very long intermetallic distance (r = 15.0 angstrom). Magnetic susceptibility measurements for 1 reveal a moderately weak but nonnegligible intramolecular anti-ferromagnetic coupling between the two metal centers across the double para-substituted diphenylethynediamidate bridge (J = -3.9 cm(-1); H = -JS(1)S(2), where S-1 = S-2 = S-Cu = 1/2). Density functional electronic structure calculations on 1 support the occurrence of a spin polarization mechanism.