The title complex, {[Cu(2)(C(10)H(8)N(2))(C(25)H(22)P(2))(2)](BF(4))(2)·2.5CH(2)Cl(2)}(n), contains chains of Cu(I) centres bridged alternately by two (diphenyl-phosphino)methane (dppm) and 4,4'-bipyridine (bpy) ligands. Each Cu(I) atom is coordinated by one N atom of 4,4'-bipyridine (bpy) and two P atoms of two (diphenyl-phosphino)methane (dppm) ligand, and has a trigonal-planar coordination geometry. There is an inversion centre midway between each pair of adjacent Cu atoms. The distance of two Cu(I) atoms separated by two (diphenyl-phosphino)methane bridging ligands is 3.732 (3) Å, and 4,4'-bipyridine 11.138 (5) Å.