Quasi-one-dimensional halogen-bridged Cu-II-Pt-IV mixed-metal complexes of the form [Cu(chxn)(2)][PtX2(chxn)(2)]X-4, where chxn = 1R,2R-diaminocyclohexane and X is either CI or Br, have been synthesized. The crystal structures of these compounds have been determined by single-crystal X-ray diffraction. The Cl-bridged compound crystallizes in the space group I222 with dimensions a = 24.237(1) Angstrom, b = 5.103(1) Angstrom, c = 6.854(1) Angstrom, and V = 847.7(1) Angstrom (3) and with Z = 1. The Br-bridged complex crystallizes in the space group I222 with dimensions a = 23.700(8) Angstrom, b = 5.344(5) Angstrom, c = 6.978(8) Angstrom, and V = 883.8(8) Angstrom (3) and with Z = 1. These structures are isomorphic to each other and to homometal [Pt(chxn)(2)][PtX2(chxn)(2)]X-4 complexes. In these complexes, the planar [Cu(chxn)(2)] and the octahedral [PtX2(chxn)(2)] groups are stacked alternatively with the axial bridging halogen ions, forming linear chain structures. The neighboring [Cu(chxn)(2)] and [PtX2(chxn)(2)] moieties along the chains are linked by hydrogen bonds between amino hydrogens and the counteranions (X). Moreover, there are hydrogen bonds among the neighboring chains that form a two-dimensional hydrogen-bonded network parallel to the bc plane. Therefore, the Cu-II and Pt-IV units are two-dimensionally ordered. The b axes correspond to the Cu-II-Pt-IV separations, which are shorter than those of [Pt(chxn)(2)][PtX2(chxn)(2)]X-4 due to the smaller ionic radius of the Cu-II ions. In the XP spectra, the Pt-IV 4f(7/2) and Pt-IV 4f(5/2) binding energies in homometal [Pt(chxn)(2)][PtX2(chxn)(2)]X-4 are lower than those of [Cu(chxn)(2)][PtX2(chxn)(2)]X-4 (X = Cl and Br), indicating that the electron-phonon interaction in Cu-II-Pt-IV compounds is stronger than that in Pt-II-Pt-IV compounds. In the Raman spectra, nu (PtIV-X) of the homometal Pt-II-Pt-IV complexes is lower than that of the Cu-II-Pt-IV complexes, indicating again that the electron-phonon interaction in Cu-II-Pt-IV compounds is stronger than that of Pt-II-Pt-IV compounds. The temperature-dependent magnetic susceptibilities of the Cu-II-Pt-IV complexes show weak antiferromagnetic interactions between Cu-II components along the chain axes.