Molecular structure of the decamolybdodicobaltate(III) ion

Evans, Howard T.; Showell, John S.

doi:10.1021/ja01052a075

Cited by 45 publications

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“…The chiral heteropolyoxomolybdate [H 4 Co 2 Mo 10 O 38 ] 6– (Figure 4)72 was resolved by Ama, Hidaka, and Shimura with traditional resolution techniques, i.e. through formation of diastereomeric salts with [Co(en) 3 ] 3+ 73.…”

Section: Chiral Pom Structuresmentioning

confidence: 99%

Chirality in Polyoxometalate Chemistry

et al. 2008

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Section: Chiral Pom Structuresmentioning

confidence: 99%

Chirality in Polyoxometalate Chemistry

et al. 2008

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“…Thus, under the reaction conditions three oxidant species coexist, namely [H 6 Co III Mo 6 O 24 ] 3−, [H 4 Co 2 Mo 10 O 38 ] 6− , and [H 5 Co III Mo 5 O 20 ] 2− . The crystal structure of [H 6 Co III Mo 6 O 24 ] 3− and [H 4 Co 2 Mo 10 O 38 ] 6− has been determined; and [H 6 Co III Mo 6 O 24 ] 3− has the Anderson's structure, and [H 5 CoMo 5 O 20 ] 2− has the Evans–Showell's structure . The polyhedral representation of [H 6 Co III Mo 6 O 24 ] 3− , [H 4 Co 2 Mo 10 O 38 ] 6− , and [H 5 Co III Mo 5 O 20 ] 2− is shown in Fig.…”

Section: Resultsmentioning

confidence: 99%

Oxidation of Hypophosphite and Phosphite by Anderson‐Type Hexamolybdocobaltate(III) Anion

Barge

Gokavi

2015

Int J of Chemical Kinetics

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The oxidation of hypophosphite and phosphite by the Anderson‐type hexamolybdocobaltate(III), [H6CoIIIMo6O24]3−, anion was investigated at pH 2 and 1, respectively, in aqueous medium. The reaction is found to occur through an outer‐sphere mechanism with a prior weak complex formation between the reactants. Under the reaction conditions, the oxidant exists in the [H5CoIIIMo5O20]2−, [H6CoIIIMo6O24]3−, and [H4CoIII2Mo10O38]6−(dimer) forms, and [H5CoIIIMo5O20]2− is the active species. Inhibition of the reaction by the oxidant anion and added molybdate ion kinetically indicates existence of prior equilibria between various forms of the oxidant. Both hypophosphite and phosphite exists in their protonated forms. The reaction involves direct electron transfer from the phosphorus center to the anion‐generating free radicals in a rate‐determining step. The effect of ionic strength and change in the solvent polarity did not affect the rate of the reaction. A probable mechanism was proposed leading to a complicated rate law as a result of involvement of prior equilibria between various forms of the oxidant. The activation parameters were also determined and are in support of the proposed mechanism.

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“…All chemicals were purchased commercially and used without further purification. (NH 4 ) 3 [CoMo 6 O 24 H 6 ]Á7H 2 O was prepared and characterized according to reported procedures (Evans & Showell, 1969;Nomiya et al, 1987). HRP (isoenzyme C, product P105528, lot K1506050, E.C.…”

Section: Methodsmentioning

confidence: 99%

A new hexamolybdate-based copper–2,2′-biimidazole coordination polymer serving as an acid catalyst and support for enzyme immobilization

et al. 2018

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The hydrothermal reaction of (NH4)3[CoMo6O24H6]·7H2O (CoMo6), CuCl2·2H2O and 2,2′‐biimidazole (H2biim) led to the formation of a new coordination polymer, namely poly[diaquabis(2,2′‐biimidazole)hexa‐μ3‐oxo‐octa‐μ2‐oxo‐hexaoxodicopper(II)hexamolybdate(VI)], [Cu2Mo6O20(C6H6N4)2(H2O)2]n (Cu‐Mo6O20), at pH 2–3. It is obvious that in the formation of crystalline Cu‐Mo6O20, the original Anderson‐type skeleton of heteropolymolybdate CoMo6 was broken and the new isopolyhexamolybdate Mo6O20 unit was assembled. In Cu‐Mo6O20, one Mo6O20 unit connects four [Cu(H2biim)(H2O)]2+ ions in a pentacoordinate mode via four terminal O atoms, resulting in a tetra‐supported structure, and each CuII ion is shared by two adjacent Mo6O20 units. Infinite one‐dimensional chains are established by linkage between two adjacent Mo6O20 units and two CuII ions, and these chains are further packed into a three‐dimensional framework by hydrogen bonds, π–π interactions and electrostatic attractions. The catalytic performance of this crystalline material used as an efficient and reusable heterogeneous acid catalyst for carbonyl‐group protection is discussed. In addition, Cu‐Mo6O20 was applied as a new support for enzyme (horseradish peroxidase, HRP) immobilization, forming immobilized enzyme HRP/Cu‐Mo6O20. HRP/Cu‐Mo6O20 showed good catalytic activity and could be reused.

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Molecular structure of the decamolybdodicobaltate(III) ion

Cited by 45 publications

References 0 publications

Chirality in Polyoxometalate Chemistry

Chirality in Polyoxometalate Chemistry

Oxidation of Hypophosphite and Phosphite by Anderson‐Type Hexamolybdocobaltate(III) Anion

A new hexamolybdate-based copper–2,2′-biimidazole coordination polymer serving as an acid catalyst and support for enzyme immobilization

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