Crystal structure of bis(tetra-n-butylammonium)dodecamolybdosulfate(<scp>VI</scp>)-(2–), [NBun4]2[SMo12O40]

Hori, Toshitaka; Himeno, Sadayuki; Tamada, Osamu

doi:10.1039/dt9960002083

Cited by 22 publications

(22 citation statements)

References 16 publications

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“…Crystals of the different polyoxometalates, (TBA) 2 [Mo 6 O 19 ], (TBA) 2 [W 6 O 19 ], (TBA) 3 [W 5 VO 19 ], (NHex 4 ) 2 [SMo 12 O 40 ] and the discrete metal-organic specie, NaAuCl 4 , were synthesized as previously reported [79,80,81]. The anion exchange processes were carried out by dissolving ca.…”

Section: Methodsmentioning

confidence: 99%

Single-Crystal-to-Single-Crystal Anion Exchange in a Gadolinium MOF: Incorporation of POMs and [AuCl4]−

2016

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Abstract:The encapsulation of functional molecules inside porous coordination polymers (also known as metal-organic frameworks, MOFs) has become of great interest in recent years at the field of multifunctional materials. In this article, we present a study of the effects of size and charge in the anion exchange process of a Gd based MOF, involving molecular species like polyoxometalates (POMs), and [AuCl 4 ]´. This post-synthetic modification has been characterized by IR, EDAX, and single crystal diffraction, which have provided unequivocal evidence of the location of the anion molecules in the framework.

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Section: Methodsmentioning

confidence: 99%

Single-Crystal-to-Single-Crystal Anion Exchange in a Gadolinium MOF: Incorporation of POMs and [AuCl4]−

2016

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“…Polyoxometalates are of continuing interest in important areas of chemistry, involving diverse compositional range and considerable structural versatility (Pope, 1983;Pope & Mu È ller, 1991, 1994, as well as important magnetic (Clemente-Juan et al, 1999), optical and catalytic properties (Pope, 1983;Pope & Mu È ller, 1991, 1994. Previous studies revealed that sulfate ions react with molybdate to produce many heteropolyanions, such as [S 2 Mo 18 O 62 ] 4À and [S 2 Mo 5 O 23 ] 4À (Hori et al, 1989(Hori et al, , 1992, -[H 3 S 2 Mo 18 O 62 ] 5À (Neier et al, 1995) and [SMo 12 O 40 ] 2À (Hori et al, 1996). However, [MoO 2 (SO 4 ) 2 ] 2À associated with an organic cation is rare.…”

Section: Commentmentioning

confidence: 99%

“…Letters a±d denote symmetry-generated atoms. (Pope, 1983;Pope et al, 1991Pope et al, , 1994, as well as important magnetic (Clemente-Juan et al, 1999), optical and catalytic properties (Pope, 1983;Pope et al, 1991Pope et al, , 1994 (Hori et al, 1989(Hori et al, , 1992 (Hori et al, 1996). However, [MoO 2 (SO 4 ) 2 ] 2− connected with organic cation is rare.…”

Section: Figurementioning

confidence: 99%

Ethylenediammonium disulfidodecamolybdate(VI)

et al. 2003

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“…21 In addition, (n-Bu 4 N) 2 [S VI Mo 12 O 40 ] was prepared according to our previous method. 5,6 The Keggin complexes are referred to as the α-isomers.…”

Section: Preparation Of 6-molybdogallate(iii)mentioning

confidence: 99%

“…Recently, we synthesized a novel Keggin complex with S(VI) as a central hetero-ion. 5,6 In an attempt to develop new analytical methods, we have continued to prepare Keggin complexes incorporating metal ions as the central hetero-ions. Based on the formation of a 12-molybdovanadate(V) complex 7 , we developed a simple voltammetric method for the determination of V(V) and V(IV).…”

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confidence: 99%

Formation of a Keggin-Type 12-Molybdogallate(III) Complex in Aqueous-Organic Media and the Application to the Voltammetric Determination of Gallium(III)

1999

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The formation of heteropoly complexes has been the basis for a widely utilized determination of oxoanions as central hetero-ions. 1 We have demonstrated the formation of new heteropolymolybdate complexes in aqueous-organic media. For example, PHO 3 2-and P 2 O 7 4-react directly with an Mo(VI)-Mo(V) reagent to form the corresponding heteropoly-blue species in CH 3 COCH 3 -containing media, and the color-forming reaction was applied to a direct spectrophotometric determination of both oxoanions. 2 The formation of a Dawson-type 18-molybdobis(sulfate)(VI) complex in aqueous CH 3 CN media was utilized for the voltammetric and spectrophotometric determination of SO 4 2-. 3,4 Among the heteropolymolybdate complexes, the Keggin complexes are of particular interest because the yellow complexes undergo reversible multi-step reductions to the corresponding heteropoly-blue species. However, most of the works have been limited to the Keggin complexes based on Si(IV), Ge(IV), P(V) and As(V). Recently, we synthesized a novel Keggin complex with S(VI) as a central hetero-ion. 5,6 In an attempt to develop new analytical methods, we have continued to prepare Keggin complexes incorporating metal ions as the central hetero-ions. Based on the formation of a 12-molybdovanadate(V) complex 7 , we developed a simple voltammetric method for the determination of V(V) and V(IV). 8 In continuation of such preparative studies, we have found that Ga(III) also reacts directly with Mo(VI) to form a 12-molybdogallate(III) complex in acidic solutions containing CH 3 CN. Raman spectroscopic and voltammetric studies have demonstrated that the yellow complex possesses the Keggin structure. The present study was undertaken to elucidate the formation conditions of the 12-molybdogallate(III) complex and to establish a voltammetric method for the direct determination of Ga(III). The voltammetric reduction current for the Keggin complex was directly proportional to the Ga (III) concentration, and the presence of many metal ions including Al(III) and In(III) did not interfere with the determination.In general, Ga(III) has been determined spectrophotometrically as a complex with chelating reagents such as tetraethylrhodamine (Rhodamine B) 9-11 , 4-(2-pyridylazo)resorcinol (PAR) 12 , 1-(2-pyridylazo)-2-naphthol (PAN) 13 and 8-hydroxyquinoline (oxine). 14 Lumogallion and Eriochrome Red B have also been used as reagents for the fluorophotometric determination of Ga(III). 15,16 In contrast, few methods have been developed for the voltammetric determination of Ga(III), although Kammori et al. described an ac polarographic method with the use of HClO 4 +NH 4 SCN as a supporting electrolyte. 17 Experimental Apparatus and materialsRaman spectra were obtained on a Jobin Yvon Model Ramanor U-1000 spectrophotometer. In order to make quantitative measurements, 0.1 M (M=mol/dm 3 ) LiNO 3 was added to each solution and used as an internal standard; the NO 3 -line was observed at 1048 cm -1 . When the Raman intensities were measured as a function of the Ga(NO 3 ) 3 con...

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Crystal structure of bis(tetra-n-butylammonium)dodecamolybdosulfate(VI)-(2–), [NBuⁿ₄]₂[SMo₁₂O₄₀]

Cited by 22 publications

References 16 publications

Single-Crystal-to-Single-Crystal Anion Exchange in a Gadolinium MOF: Incorporation of POMs and [AuCl4]−

Single-Crystal-to-Single-Crystal Anion Exchange in a Gadolinium MOF: Incorporation of POMs and [AuCl4]−

Ethylenediammonium disulfidodecamolybdate(VI)

Formation of a Keggin-Type 12-Molybdogallate(III) Complex in Aqueous-Organic Media and the Application to the Voltammetric Determination of Gallium(III)

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Crystal structure of bis(tetra-n-butylammonium)dodecamolybdosulfate(VI)-(2–), [NBun4]2[SMo12O40]

Cited by 22 publications

References 16 publications

Single-Crystal-to-Single-Crystal Anion Exchange in a Gadolinium MOF: Incorporation of POMs and [AuCl4]−

Single-Crystal-to-Single-Crystal Anion Exchange in a Gadolinium MOF: Incorporation of POMs and [AuCl4]−

Ethylenediammonium disulfidodecamolybdate(VI)

Formation of a Keggin-Type 12-Molybdogallate(III) Complex in Aqueous-Organic Media and the Application to the Voltammetric Determination of Gallium(III)

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Crystal structure of bis(tetra-n-butylammonium)dodecamolybdosulfate(VI)-(2–), [NBuⁿ₄]₂[SMo₁₂O₄₀]