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Monopotassium monosodium hexa-hydrogen ?-hexa-molybdoplatinate(IV) undeca-hydrate.

ABSTRACT: The title compound, KNa[H(6)PtMo(6)O(24)]·11H(2)O, contains a discrete hexa-molybdoplatinate(IV) [H(6)PtMo(6)O(24)](2-) poly-anion (1 symmetry), which has the highest level of protonation. Five O atoms of the central PtO(6) octa-hedron (?(3)-atoms, Oc) and one O atom of an outer edge-sharing MoO(6) octa-hedron (O bridging ?(2)-atom, Ob) are protonated. The polyanions are connected by almost linear O-H?O hydrogen bonds between protonated and unprotonated Ob atoms. Further consolidation of the crystal structure is accomplished by extensive O-H?O hydrogen bonding involving the uncoordinated water mol-ecules. The two independent K(+) cations are equally disordered about a twofold rotation axis.

SUBMITTER: Lee U

PROVIDER: S-EPMC2979713 | biostudies-literature | 2010 Jan

REPOSITORIES: biostudies-literature

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Monopotassium monosodium hexa-hydrogen α-hexa-molybdoplatinate(IV) undeca-hydrate.

Lee Uk U Joo Hea-Chung HC

Acta crystallographica. Section E, Structure reports online 20100123 Pt 2

The title compound, KNa[H(6)PtMo(6)O(24)]·11H(2)O, contains a discrete hexa-molybdoplatinate(IV) [H(6)PtMo(6)O(24)](2-) poly-anion (1 symmetry), which has the highest level of protonation. Five O atoms of the central PtO(6) octa-hedron (μ(3)-atoms, Oc) and one O atom of an outer edge-sharing MoO(6) octa-hedron (O bridging μ(2)-atom, Ob) are protonated. The polyanions are connected by almost linear O-H⋯O hydrogen bonds between protonated and unprotonated Ob atoms. Further consolidation of the cry ...[more]

PMID: 21579594

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Redetermination of hepta-potassium nona-hydrogen bis-[?-hexa-molybdoplatinate(IV)] undeca-hydrate.

Project description:Previously reported at a temperature of 298?(2)?K [Lee & Joo (2007 ?). Acta Cryst. E63, i11-i13], the title compound, K(7)[H(9)?-Pt(2)Mo(12)O(48)]·11H(2)O or K(7)[H(4.5)?-PtMo(6)O(24)](2)·11H(2)O, was redetermined at 146?(2)?K in order to determine whether the H atom in the hydrogen bond that crosses the center of symmetry was located at the center of symmetry or disordered around it as assumed in the previous study. During the present low-temperature study it was found on the center of symmetry. One water molecule shows half-occupancy.

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