Double salt crystal structure of hexa-sodium hemiundeca-hydrogen ?-hexa-molybdoplatinate(IV) heminona-hydrogen ?-hexa-molybdoplatinate(IV) nona-cosa-hydrate: di-hydrogen disordered-mixture double salt.

ABSTRACT: The title double salt containing two distinct, differently protonated hexa-molybdoplatinate(IV) polyanions, Na6[H5.5 ?-PtMo6O24][H4.5 ?-PtMo6O24]·29H2O, has been synthesized by a hydro-thermal reaction at ca pH 1.80. The positions of the H atoms in the polyanions were established from difference Fourier maps and confirmed by the inter-polyanion hydrogen bonds, bond-distance elongation, and bond-valence sum (BVS) calculations. The fractional numbers of H atoms in each polyanion are required for charge balance and in order to avoid unrealistically short H?H distances in the inter-polyanion hydrogen bonds. Considering the disorder, the refined formula of the title polyanion, {[H5.5 ?-PtMo6O24]; polyanion (A) and [H4.5 ?-PtMo6O24]; polyanion (B)}(6-), can be rewritten as a set of real formula, viz. {[H6 ?-PtMo6O24]; polyanion (A). [H4 ?-PtMo6O24]; polyanion (B)}(6-) and {[H5 ?-PtMo6O24]; polyanion (A). [H5 ?-PtMo6O24]; polyanion (B)}(6-). The polyanion pairs both form dimers of the same formula, viz. {[H10 ?-Pt2Mo12O48]}(6-) connected by seven inter-polyanion O-H?O hydrogen bonds.

SUBMITTER: Joo HC 

PROVIDER: S-EPMC4647359 | biostudies-literature | 2015 Oct

REPOSITORIES: biostudies-literature