In the title compound, [Cu(C(14)H(12)N(2)O(4))(C(36)H(28)OP(2))]PF(6)·CH(3)CN, the Cu(I) ion is coordinated by two N atoms from the dimethyl 2,2'-biphenyl-4,4'-dicarboxyl-ate ligand and two P atoms from the bis-[2-(diphenyl-phosphino)phen-yl] ether ligand in a distorted tetra-hedral environment. In the cation, the short distance of 3.870 (4) Å between the centroids of the benzene and phenyl rings suggests the existence of intra-molecular π-π inter-actions.