Syntheses and physical properties of quasi-one-dimensional halogen-bridged CuII-PtIV mixed-metal complexes [Cu(chxn)2][PtX2(chxn)2]X4

Quasi-one-dimensional halogen-bridged CuII−PtIV mixed-metal complexes of the form [Cu(chxn)2][PtX2(chxn)2]X4, where chxn = 1R,2R-diaminocyclohexane and X is either Cl 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) A, b = 5.103(1) A, c = 6.854(1) A, and V = 847.7(1) A3 and with Z = 1. The Br-bridged complex crystallizes in the space group I222 with dimensions a = 23.700(8) A, b = 5.344(5) A, c = 6.978(8) A, and V = 883.8(8) A3 and with Z = 1. These structures are isomorphic to each other and to homometal [Pt(chxn)2][PtX2(chxn)2]X4 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 hydr...