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

ABSTRACT: 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.

SUBMITTER: Lee U

PROVIDER: S-EPMC2984051 | biostudies-literature | 2010 Mar

REPOSITORIES: biostudies-literature

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

Lee Uk U Joo Hea-Chung HC Park Ki-Min KM

Acta crystallographica. Section E, Structure reports online 20100313 Pt 4

Previously reported at a temperature of 298 (2) K [Lee & Joo (2007 ▶). Acta Cryst. E63, i11-i13], the title compound, K(7)[H(9)α-Pt(2)Mo(12)O(48)]·11H(2)O or K(7)[H(4.5)α-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 ...[more]

PMID: 21580460

Similar Datasets

Crystal structure of hepta-guanidinium nona-hydrogen bis-[α-hexa-molybdoplatinate(IV)] hepta-hydrate.

Project description:The title compound, (CH6N3)7H9[PtMo6O24]2·7H2O, containing the well-known Anderson-type heteropolyoxomolybdate, was obtained by recrystallization of its powdered guanidinium salt. The protonated O atoms in the polyanion were confirmed by electron-density maps, inter-polyanion hydrogen bonds and bond-valance sums (BVS). The {[H4.5PtMo6O24]2}(7-) polyanion is the same as that already characterized in K7[H4.5PtMo6O24]2·11H2O [space group P-1; Lee & Joo (2010 ▶). Acta Cryst. E66, i8-i9]. The heteropolyanions form inversion-generated dimers, {[H4.5PtMo6O24]2}(7-), held together by each of the four μ3-O-H⋯μ1-O, two μ2-O-H⋯μ2-O hydrogen bonds and one centrosymmetric μ3-O-H-μ3-O hydrogen bond. The H atom of the centrosymmetric hydrogen bond is located on an inversion centre. One guanidinium ion and one water mol-ecule are equally disordered about a twofold rotation axis.

| S-EPMC4350731 | biostudies-literature

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

Project description: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.

| S-EPMC2979713 | biostudies-literature

Crystal structure of undeca-potassium bis-[α-hemi-penta-hydrogen hexa-molybdoplatinate(IV)] dodeca-hydrate.

Project description:The title compound, K11[α-Pt(μ3-OH)2(μ3-OH0.5)Mo6(μ3-O)3(μ2-O)6O12]2·12H2O (simplified chemical formula K11[H2.5PtMo6O24]2·12H2O), containing the well-known Anderson-type heteropolyoxomolybdate anion, was obtained by hydro-thermal reaction at pH = ca 6.0. The complete polyanion dimer has 2/m symmetry. The locations of the H atoms with respect to protonated O atoms were obtained from difference Fourier maps, and confirmed by the inter-polyanion hydrogen bonds, bond-length elongation and bond-valence sums (BVSs). The title heteropolyanion has two types of protonated O atoms viz. μ3-OH, {Mo2-O(H)-Pt} and μ3-OH0.5 (disordered H atom). The [H2.5α-PtMo6O24](5.5-) polyanion forms a dimer, [(H2.5α-PtMo6O24)2](11-), held together by two pairs of μ3-O-H⋯μ1-O and of one disordered μ3-O⋯H⋯μ3-O hydrogen bonds. Three K(+) ions are located on special positions (two on twofold rotation axes, one on a mirror plane), and two K(+) ions are located on general positions with a reduced occupancy of 0.5. The remaining K(+) ion has a reduced occupancy of 0.25 for charge balance and reasonable displacement parameters. As a result, the numbers of K(+) and H(+) ions in the title compound are 5.5 and 2.5, respectively.

| S-EPMC4571373 | biostudies-literature

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

Project description:The title double salt containing two distinct, differently protonated hexa-molybdoplatinate(IV) polyanions, Na6[H5.5 α-PtMo6O24][H4.5 α-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 α-PtMo6O24]; polyanion (A) and [H4.5 α-PtMo6O24]; polyanion (B)}(6-), can be rewritten as a set of real formula, viz. {[H6 α-PtMo6O24]; polyanion (A). [H4 α-PtMo6O24]; polyanion (B)}(6-) and {[H5 α-PtMo6O24]; polyanion (A). [H5 α-PtMo6O24]; polyanion (B)}(6-). The polyanion pairs both form dimers of the same formula, viz. {[H10 α-Pt2Mo12O48]}(6-) connected by seven inter-polyanion O-H⋯O hydrogen bonds.

| S-EPMC4647359 | biostudies-literature

Crystal structure of penta-potassium di-hydrogen nona-vanadato(V)platinate(IV) nona-hydrate.

Project description:The title compound, K5[H2PtV9O28]·9H2O, containing the nona-vanado-platinate(IV) polyanion, was obtained by hydro-thermal reaction at pH = 4.2. The polyanion has approximate mm2 (C 2v ) symmetry. The two platinum-bound μ2-O atoms are protonated in the polyanion. The heteropolyanions form inversion-generated dimers, {[H2PtV9O28]2}(10-), held together by μ2-O-H⋯μ2-O and μ2-O-H⋯μ3-O hydrogen bonds. All K(+) cations are located on general positions of the space group P-1.

| S-EPMC4459313 | biostudies-literature

Redetermination of hexa-sodium hepta-molybdate(VI) 14-hydrate.

Project description:The structure of the title compound, Na(6)(Mo(7)O(24))·14H(2)O, has been redetermined [Sjöbom & Hedman (1973). Acta Chem. Scand.27, 3673-3674] and the hydrogen atoms have been located. The Na(+) cations adopt distorted octa-hedral geometries and the structure of the [Mo(7)O(24)](6-) anion is consistent with those of other hepta-molbydates. In the crystal, numerous O-H?O hydrogen bonds help to establish the packing.

| S-EPMC2979069 | biostudies-literature

Crystal structure of potassium sodium hepta-hydrogen hexa-molybdocobaltate(III) octa-hydrate: an extra-protonated B-series Anderson-type heteropolyoxidometalate.

Project description:The title compound, KNa[Co(III)(OH)7{Mo6O17}]·8H2O, was obtained by the ion-exchange technique from K3[Co(μ3-OH)6Mo6O18]·7H2O. Six μ3-O atoms and one O atom of the bridging μ2-O atom are protonated. This novel polyanion protonated by an extra H atom is an unexpected polyanion species among the B-series Anderson-type polyoxidometalates (POMs), [X(n) (+)(μ3-OH)6Mo6O18]((6-n)-)] (X = heteroatom). The extra H atom (seventh H atom) in the polyanion does not lie on a crystallographic centre of symmetry, but is located at the mid-point between two μ2-O atoms of adjacent polyanions, and forms a very short hydrogen bond [2.430 (5) Å]. The present structure is considered as particularly significant in understanding noncentrosymmetric strong hydrogen bonding.

| S-EPMC4555401 | biostudies-literature

Triammonium hexa-hydroxidoocta-deca-oxidohexa-molybdogallate(III) hepta-hydrate.

Project description:The title compound, (NH(4))(3)[GaMo(6)(OH)(6)O(18)]·7H(2)O, contains two centrosymmetric GaMo(6) B-type Anderson cluster units consisting of central GaO(6) octa-hedra surrounded by a hexa-gonal assembly of MoO(6) edge-sharing octa-hedra. Like other B-type Anderson clusters, where the central Mo atom is substituted with a di- or trivalent metal ion, the central six μ(3)-oxido bridges are protonated. The average Ga-O bond length is 1.97 (1) Å, whereas the average Mo-O distances are 2.29 (2), 1.94 (1) and 1.709 (5) Å, respectively, for Mo-(μ(3)-OH), Mo-(μ(2)-O) and Mo=O bonds. In the crystal structure, the Ga(μ(3)-OH)(6)Mo(6)O(18) (3-) polyanionic clusters are surrounded by NH(4) (+) cations and solvent water mol-ecules, forming an extended network of hydrogen bonds.

| S-EPMC2960397 | biostudies-literature

Double salt crystal structure of nona-sodium dihydrogen nona-vanadoplatinate(IV) tri-hydrogen nona-vanadoplatinate(IV) tetra-contahydrate: stepwise-protonated nona-vanadoplatinate(IV).

Project description: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.

| S-EPMC4518920 | biostudies-literature

Calcium disodium hexa-thio-diphosphate(IV) octa-hydrate.

Project description:Single crystals of the title compound, CaNa(2)(P(2)S(6))·8H(2)O, were obtained by adding calcium hydroxide to an aqueous solution of Na(4)(P(2)S(6))·6H(2)O. The structure is isotypic with that of its strontium analogue and consists of one Ca(2+) cation, two Na(+) cations, one-half of a centrosymmetric (P(2)S(6))(4-) anion with staggered confirmation and four water mol-ecules in the asymmetric unit. The crystal structure can be described as being built up from layers of cations and anions extending parallel to (101). Within a layer, each CaO(8) polyhedron is connected via edge-sharing to two NaO(4)S(2) octa-hedra and to one NaO(2)S(4) octa-edron. The NaO(4)S(2) octa-hedra are, in turn, linked with two (P(2)S(6))(4-) anions through common corners. Various O-H?S hydrogen-bonding inter-actions lead to cohesion of adjacent layers. The Ca(2+) and one Na(+) cation are situated on a twofold rotation axis and the second Na(+) cation is situated on an inversion centre.

| S-EPMC3007360 | biostudies-literature

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