Sulfates in one-dimensional halogen-bridged mixed-valence platinum complexes were synthesized in order to elucidate contributions of hydrogen bonds between in-plane ligand amines and counter ions to the mixed-valence state. Their intervalence charge-transfer bands measured by using the single crystals and their structures determined by single crystal X-ray diffraction analyses show that the energy difference of dz2 orbitals between the PtII and the PtIV becomes larger with decreasing linkages between the Pt units by the hydrogen bonds, comparing with Perchlorates and hydrogensulfates. © 1992, Taylor &amp
Francis Group, LLC. All rights reserved.