title: Anhydrous penta-guanidinium dihydrogen nona-vanado(IV)platinate(IV).
abstract: The title compound, (CH(6)N(3))(5)[H(2)PtV(9)O(28)], containing the nona-vanadoplatinate(IV) polyanion, was obtained by hydro-thermal reaction. The polyanion has approximate C(2v) symmetry. The two Pt-bound μ(2)-O atoms are protonated in the polyanion. The heteropolyanions form inversion-generated dimers, {[H(2)PtV(9)O(28)](2)}(10-), held together by each of the two μ(2)-O-H⋯μ(2)-O and μ(2)-O-H⋯μ(3)-O hydrogen bonds. The guanidinium cations are hydrogen bonded with the μ(2)- and terminal O atoms of the polyanion, connecting the polyanions into a three-dimensional network.
authors.forename: Hea-Chung
authors.initials: HC
authors.lastname: Joo
authors.forename: Ki-Min
authors.initials: KM
authors.lastname: Park
authors.forename: Uk
authors.initials: U
authors.lastname: Lee