Acta Crystallographica Section E

Structure Reports Online

Volume 59, Part 1 (January 2003)

metal-organic compounds

Acta Cryst. (2003). E59, m26-m28 [ doi:10.1107/S1600536802022584 ]

A one-dimensional Cl-bridged Pt^II/IV mixed-valence complex, catena-poly[[bis(ethylenediamine)platinum(II)--chloro-bis(ethylenediamine)platinum(IV)--chloro] tetrakis(hydrogensulfate)]

N. Matsushita

Abstract: The title compound, [PtCl₂(C₂H₈N₂)₄](HSO₄)₄ or [Pt(C₂H₈N₂)₂][Pt₂Cl₂(C₂H₈N₂)₂](HSO₄)₄, has a linear chain structure composed of square-planar [Pt(en)₂]²⁺ and elongated octahedral trans-[PtCl₂(en)₂]²⁺ cations (en is ethylenediamine) stacked alternately, bridged by the Cl atoms, along the c axis. The Cl atom bridging the adjacent Pt atoms is disordered over two sites along the Cl-Pt^IV-ClPt^II chain, which lies on a twofold axis. The Pt^IV-Cl and Pt^IICl bond lengths are 2.323 (2) and 3.142 (2) Å, respectively. A structural parameter [delta] = (Pt^IV-Cl)/(Pt^IICl), indicating the mixed-valence state of the Pt atom ( [delta] = 0.739), shows a good correlation with the data of the intervalence charge-transfer (IVCT) absorption band.