Capillary electrophoretic study on the formation and transformation of isopolyoxotungstates in aqueous and aqueous-CH3CN media

Himeno, Sadayuki; Kitazumi, Iwao

doi:10.1016/s0020-1693(03)00313-x

Cited by 15 publications

(12 citation statements)

References 23 publications

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“…† Keggin-type polyanions of 1-3 show absorption maxima at similar wavelengths (l max (1) ¼ 251, l max (2) ¼ 261 and l max (3) ¼ 266 nm) in the region of 200-500 nm, which are the characteristic charge transfer bands from oxygen to tungsten in the POM framework. 28 Thus, the UV-vis electronic spectra of 1-3 are also in accordance with the crystal structure determination.…”

Section: Analyses Of Bvs Ir Tg Measurements Xrd and Uvsupporting

confidence: 73%

Study of a hydrothermal reaction system of copper, imidazole and polyoxometalates: selective assembly of a 3D porous metal–organic pseudo-rotaxane framework and encapsulation of polyoxometalate clusters

Pang

Peng

et al. 2011

CrystEngComm

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Three new compounds, [Cu(bimb)] 2 (HPW 12 O 40 )$3H 2 O (1), (H 2 bimb) 2 SiW 12 O 40 (2) and (H 2 bimb) 3 CoW 12 O 40 ( 3) (bimb ¼ 1,4-bis(imidazol-1-ylmethyl)biphenyl), have been synthesized under the same hydrothermal conditions. Structural characterizations by single-crystal X-ray diffraction show that compound 1 possesses a porous metal-organic pseudo-rotaxane framework in which [PW 12 O 40 ] 3À clusters are encapsulated, whereas compounds 2 and 3 are common supramolecular compounds. The distinct structure of compound 1 suggests that the porous framework may selectively encapsulate the polyoxometalate clusters, although the three polyoxometalate clusters have subtle structural differences. Catalytic photodegradation of organic dye RhB by compounds 1-3 has been studied.

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Section: Analyses Of Bvs Ir Tg Measurements Xrd and Uvsupporting

confidence: 73%

Study of a hydrothermal reaction system of copper, imidazole and polyoxometalates: selective assembly of a 3D porous metal–organic pseudo-rotaxane framework and encapsulation of polyoxometalate clusters

Pang

Peng

et al. 2011

CrystEngComm

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“…As a high‐performance liquid‐separation technique, CZE has advantages of high efficiency and sensitivity, rapid analysis, extremely low sample volume requirements, and the ability to utilize several detection methods; thus, it has been used widely to analyze trace amounts or complex samples. There are only a few reports of studies of the separation and analysis of POMs through CZE . Here, we performed a systematic study on the CZE analysis of the equilibria of pentamolybdobis(phenylphosphonate) under various experimental conditions through the variation of concentration, counterion, and buffer pH, as well as the interactions of pentamolybdobis(phenylphosphonate) in solution with amino acids (AAs) and cyclodextrins (CDs).…”

Section: Introductionmentioning

confidence: 99%

“…There are only a few reports of studies of the separation and analysis of POMs through CZE. [30][31][32][33][34] Here, we performed a systematic study on the CZE analysis of the equilibria of pentamolybdobis(phenylphosphonate) under various experimental conditions through the variation of concentration, counterion, and buffer pH, as well as the interactions of pentamolybdobis(phenylphosphonate) in solution with amino acids (AAs) and cyclodextrins (CDs). [35][36][37] is shown in Figure 1 The equilibrium was established out of the CZE capillary by incubating the sample in a vial for a period of time.…”

Section: Introductionmentioning

confidence: 99%

Capillary Zone Electrophoresis as a Tool to Monitor the Stability and Hydrolytic Equilibria of Strandberg‐Type Polyoxometalates in Aqueous Solution

et al. 2016

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In this study, we applied capillary zone electrophoresis (CZE) to investigate the solution stability and equilibria of pentamolybdobis(phenylphosphonate), [(C6H5PO3)2Mo5O15]4–, which is a Strandberg‐type of polyoxometalate (POM) with considerable promise as an antiviral and anti‐HIV chemotherapeutic agent. This is achieved by analyzing the intensities and shapes of the three peaks in the CZE electropherogram that correspond to the three components involved in the equilibria, that is, [(C6H5PO3)2Mo5O15]4–, [Mo7O24]6–, and [Mo8O26]4– anions. The dependence of the equilibria of pentamolybdobis(phenylphosphonate) on various conditions, including sample concentration, counterion, and solution pH, was investigated through CZE. The interactions of pentamolybdobis(phenylphosphonate) with amino acids and cyclodextrins in solution were also investigated and discussed on the basis of the CZE results. Our study indicates that CZE has great potential as a simple, low‐cost, and efficient method to monitor the synthesis, purity, stability, and solution equilibria of POMs.

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“…This observation was explored further when we used bulky organocations to help isolate and connect {Mo 8 Ag 2 } building blocks into larger polymeric architectures. [25,26] The extension of this approach to isopolyoxotungstates [27,28] has also proved important in allowing us to isolate a family of {W 36 }-based host-guest complexes [29,30] (Figure 1). The {W 36 } itself is assembled from three {W 11 } y-metatungstate units [27,28] that are linked by a set of three connecting [WO 6 ] octahedra so that the overall structure can be rationalised as {W 36 } = {W 11 } 3 {W 1 } 3 ( Figure 1).…”

Section: Introductionmentioning

confidence: 99%

“…[25,26] The extension of this approach to isopolyoxotungstates [27,28] has also proved important in allowing us to isolate a family of {W 36 }-based host-guest complexes [29,30] (Figure 1). The {W 36 } itself is assembled from three {W 11 } y-metatungstate units [27,28] that are linked by a set of three connecting [WO 6 ] octahedra so that the overall structure can be rationalised as {W 36 } = {W 11 } 3 {W 1 } 3 ( Figure 1). This {W 36 } cluster represents the largest isopolyoxotungstate so far discovered and can be described as a ringshaped unit that features a metal-oxo framework, which resembles the [18]crown-6 ether.…”

Section: Introductionmentioning

confidence: 99%

Hybrid Host–Guest Complexes: Directing the Supramolecular Structure through Secondary Host–Guest Interactions

Streb

McGlone

Brücher

et al. 2008

Chemistry A European J

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A set of four hybrid host-guest complexes based on the inorganic crown ether analogue [H12W36O120]12- ({W36}) have been isolated and characterised. The cluster anion features a central rigid binding site made up of six terminal oxygen ligands and this motif allows the selective binding of a range of alkali and alkali-earth-metal cations. Here, the binding site was utilised to functionalise the metal oxide-based cavity by complexing a range of protonated primary amines within the recognition site. As a result, a set of four hybrid organic-inorganic host-guest complexes were obtained whereby the interactions are highly directed specifically within this cavity. The guest cations in these molecular assemblies range from the aromatic 2-phenethylamine (1) and 4-phenylbutylamine (2) to the bifunctional aromatic p-xylylene diamine (3) and the aliphatic, bifunctional 1,6-diaminohexane (4). Compounds 1-4 were structurally characterised by single-crystal X-ray diffraction, elemental analysis, flame atomic absorption spectroscopy, FTIR and bond valence sum calculations. This comparative study focuses on the supramolecular effects of the amine guest cations and investigates their structure-directing effects on the framework arrangement arising by locking the protonated amines within the cavity of the {W36} cluster. It was shown that parts of the organic guest cation protrude from the central binding cavity and the nature of this protruding organic "tail" directs the solid-state arrangement of compounds 1-4. Guest cations with a hydrophobic phenyl tail result in an antiparallel assembly of {W36} complexes arranged in a series of pillared layers. As a consequence, no direct supramolecular interactions between {W36} clusters are observed. In contrast, bifunctional guest cations with a secondary amino binding site act as molecular connectors and directly link two cluster units thus locking the supramolecular assembly in a tilted arrangement. This direct linking of {W36} anions results in the formation of an infinite supramolecular scaffold.

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Capillary electrophoretic study on the formation and transformation of isopolyoxotungstates in aqueous and aqueous-CH3CN media

Cited by 15 publications

References 23 publications

Study of a hydrothermal reaction system of copper, imidazole and polyoxometalates: selective assembly of a 3D porous metal–organic pseudo-rotaxane framework and encapsulation of polyoxometalate clusters

Study of a hydrothermal reaction system of copper, imidazole and polyoxometalates: selective assembly of a 3D porous metal–organic pseudo-rotaxane framework and encapsulation of polyoxometalate clusters

Capillary Zone Electrophoresis as a Tool to Monitor the Stability and Hydrolytic Equilibria of Strandberg‐Type Polyoxometalates in Aqueous Solution

Hybrid Host–Guest Complexes: Directing the Supramolecular Structure through Secondary Host–Guest Interactions

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