Double salt crystal structure of nona-sodium dihydrogen nona-vanadoplatinate(IV) tri-hydrogen nona-vanadoplatinate(IV) tetra-contahydrate: stepwise-protonated nona-vanadoplatinate(IV).
Nonavanadoplatinate [Pt(IV)V9O28](7-), which is the first heteropolyoxovanadate in the deca-vanadate framework, [V10O28](6-), has been investigated crystallographically. The title compound, Na9[H2Pt(IV)V9O28][H3Pt(IV)V9O28]·40H2O, was obtained by a hydro-thermal reaction at pH = 2. This compound contains two different protonated heteropolyoxovanadates, [H2Pt(IV)V9O28](5-) [polyanion (A)] and [H3Pt(IV)V9O28](7-) [polyanion (B)]. The locations of the H atoms on the protonated O atoms were observed in difference Fourier maps and confirmed by the inter-polyanion hydrogen bonds, bond-length elongation and bond-valence-sum (VBS) analysis. The two (Pt and V)-bound μ2-O atoms are protonated in both polyanions. The position of the third protonated O atom in polyanion (B) is an inter-esting feature of the structure, being located on one (V2)-bound μ2-O atom. The discrete heteropolyanions form a dimer, {H5[PtV9O28]2}(9-), through five inter-polyanion hydrogen bonds. Additional O-H⋯O hydrogen bonds and interactions between Na(+) cations and water molecules as well as terminal O atoms of one of the polyanions consolidate the crystal packing.
Department of Chemistry, Pukyong National University, 599-1 Daeyeon 3-dong, Nam-gu, Busan 608-737, Republic of Korea.
Hea-Chung
HC
Joo
Research Institute of Natural Science, Gyeongsan National University, 501, Jinju-daero, Jinju, 660-701, Republic of Korea.
Ki-Min
KM
Park
Department of Chemistry, Pukyong National University, 599-1 Daeyeon 3-dong, Nam-gu, Busan 608-737, Republic of Korea.
Uk
U
Lee
crystal structure; heteropolyoxovanadate containing platinum(IV); hydrogen bonding; protonated nona­vanadoplatinate(IV)