title: A one-dimensional chloride-bridged Pt(II)/Pt(IV) mixed-valence complex with a 4-[(4-hydroxyphenyl)diazenyl]benzenesulfonate counter-ion.
abstract: The title compound, catena-poly[[[bis(ethylenediamine-κ(2)N,N')platinum(II)]- μ-chlorido-[bis(ethylenediamine)platinum(IV)]-μ-chlorido] tetrakis{4-[(4-hydroxyphenyl)diazenyl]benzenesulfonate} dihydrate], {[Pt(II)Pt(IV)Cl2(C2H8N2)4](HOC6H4N=NC6H4SO3)4·2H2O}n, has a linear chain structure composed of square-planar [Pt(en)2](2+) (en is ethylenediamine) and elongated octahedral trans-[PtCl2(en)2](2+) cations stacked alternately, bridged by Cl atoms, along the b axis. The Pt atoms are located on an inversion centre, while the Cl atoms are disordered over two sites and form a zigzag ...Cl-Pt(IV)-Cl...Pt(II)... chain, with a Pt(IV)-Cl bond length of 2.3140 (14) Å, an interatomic Pt(II)...Cl distance of 3.5969 (15) Å and a Pt(IV)-Cl...Pt(II) angle of 170.66 (6)°. The structural parameter indicating the mixed-valence state of the Pt atom, expressed by δ = (Pt(IV)-Cl)/(Pt(II)...Cl), is 0.643.
authors.affiliation: Department of Chemistry and Research Center for Smart Molecules, Rikkyo University, Nishi-Ikebukuro 3-34-1, Toshima-ku, 171-8501 Tokyo, Japan.
authors.forename: Nobuyuki
authors.initials: N
authors.lastname: Matsushita
authors.affiliation: Department of Chemistry, Graduate School of Arts and Sciences, University of Tokyo, Komaba 3-8-1, Meguro-ku, 153-8902 Tokyo, Japan.
authors.forename: Ayako
authors.initials: A
authors.lastname: Taira
keywords: amphiphilic azobenzene; crystal structure; halogen-bridged complex; mixed-valence compound; one-dimensional chain complex; platinum coordination polymer