[(C2H5)4N]4[Mo8O26]: a redetermination and correction

Kalpana, G.; Vidyasagar, K.

doi:10.1107/s1600536805026899

Cited by 6 publications

(4 citation statements)

References 8 publications

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“…This cluster is reported to be the predominant Mo anion in an aqueous solution of pH values ranging from 2 to 3.5 . In the solid state, it has been characterized into nine isomers, namely, α, , β, − γ, − δ, − ε, ζ, , ξ, η, and θ, , showing the flexibility of octamolybdate, whose geometry depends strongly on the nature of the organic countercation. In addition, few compounds containing infinite 1 / ∞ [Mo 8 O 26 ] 4- chains have been characterized, and these can be classified into three types depending on the connection mode of the γ-[Mo 8 O 28 ] subunits, as shown in Figure .…”

Section: Methodsmentioning

confidence: 99%

Synthesis, Characterization, and Photochromic Properties of Hybrid Organic−Inorganic Materials Based on Molybdate, DABCO, and Piperazine

et al. 2007

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Prompted by our interest in new photochromic organic-inorganic hybrid materials, the reactivity of [Mo7O24]6- toward a structure-directing reagent diamine such as 1,4-diazabicyclo[2.2.2]octane (DABCO) and piperazine (pipz) has been investigated, and three new molybdenum(VI)-containing compounds, namely, (H2DABCO)3[Mo7O24].4H2O (1), (H2DABCO)[Mo3O10].H2O (2), and (H2DABCO)2(NH4)2[Mo8O27].4H2O (3), have been synthesized and characterized. New synthetic routes to achieve the known compounds (H2DABCO)2(H2pipz)[Mo8O27] (4), (H2pipz)3[Mo8O27] (5), and (H2DABCO)2[Mo8O26].4H2O (6) are also reported. All of these compounds contain different poly(oxomolybdate) clusters, i.e., discrete [Mo7O24]6- blocks in 1, infinite polymeric chains 1/infinity[Mo3O10]2- in 2, 1/infinity[Mo8O27]6- in 3-5, and 1/infinity[Mo8O26]4- in 6, associated in a tridimensional assembly by hydrogen bonds with H2DABCO2+ and/or H2pipz2+ cations. Interconversion pathways and chemical factors affecting the stabilization of the different species are highlighted and discussed. At the opposite of 6, compounds 1-5 show photochromic behavior under UV excitation. Namely, compounds 1-5 shift from white or pale yellow to pale pink, reddish brown, or purple under UV illumination depending on the chemical nature of the mineral framework, with the kinetics of the color change being dictated by the nature of the organic component and by the organic-inorganic interface.

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Section: Methodsmentioning

confidence: 99%

Synthesis, Characterization, and Photochromic Properties of Hybrid Organic−Inorganic Materials Based on Molybdate, DABCO, and Piperazine

et al. 2007

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“…In fact, the [Mo 8 O 26 ] 4− entity is a flexible block that can adopt numerous different geometries. For example, the isolated [Mo 8 O 26 ] 4− cluster has been characterized in the solid state into nine isomers, namely, α, , β, − γ, − δ, − ε, ζ, , ξ, η, and θ. , Because of the lack of Raman characterizations for these species, the topology of the octamolybdate block in 11 cannot be precisely identified. Nevertheless, we may suppose that 11 contains one of the aforementioned species, bare β-[Mo 8 O 26 ] 4− and δ-[Mo 8 O 26 ] 4− isomers whose absorption lines do not coincide (see S6 in the Supporting Information).…”

Section: Hybrid Organic−inorganic Materials Based On Mo-poms and A2+ ...mentioning

confidence: 99%

How Does the Synthesis Temperature Impact Hybrid Organic−Inorganic Molybdate Material Design?

et al. 2010

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We investigate the reactivity of MoO(4)(2-) toward six organoammonium cations (+)(Me(3-x)H(x)N)(CH(2))(2)(NH(y)Me(3-y))(+) (x, y = 1-3) at different synthesis temperatures ranging from 70 to 180 °C. A total of 16 hybrid organic-inorganic materials have been synthesized at an initial pH of 2, via ambient pressure and hydrothermal routes, namely, (H(2)en)[Mo(3)O(10)]·H(2)O (1), (H(2)en)[Mo(3)O(10)] (2), (H(2)en)[Mo(5)O(16)] (3), (H(2)MED)(2)[Mo(8)O(26)]·2H(2)O (4), (H(2)MED)[Mo(5)O(16)] (5), (N,N-H(2)DMED)(2)[Mo(8)O(26)]·2H(2)O (6), (N,N-H(2)DMED)(2)[Mo(8)O(26)]·2H(2)O (7), (N,N'-H(2)DMED)(2)[Mo(8)O(26)] (8), (N,N'-H(2)DMED)[Mo(5)O(16)] (9), (H(2)TriMED)(2)[Mo(8)O(26)]·4H(2)O (10), (H(2)TriMED)(2)[Mo(8)O(26)]·2H(2)O (11), (H(2)TriMED)[Mo(7)O(22)] (12), (H(2)TMED)(2)[Mo(8)O(26)]·2H(2)O (13), (H(2)TMED)(2)[Mo(8)O(26)] (14), (H(2)TMED)(2)[Mo(8)O(26)] (15), and (H(2)TMED)[Mo(7)O(22)] (16). All of these compounds contain different polyoxomolybdate (Mo-POM) blocks, i.e., discrete β-[Mo(8)O(26)](4-) blocks in 6, 10, 13, 14, (1)/(∞)[Mo(3)O(10)](2-), and (1)/(∞)[Mo(8)O(26)](4-) polymeric chains in 1, 2, 4, 7, 8, and 15, respectively, and (2)/(∞)[Mo(5)O(16)](2-) and (2)/(∞)[Mo(7)O(22)](2-) layers in 3, 5, 9, 12, and 16, respectively. The structures of 5, 9, and 14 have been resolved by single-crystal X-ray analyses. The characterization of the different Mo-POM blocks in 1-16 by Fourier transform Raman spectroscopy is reported. The impact of the synthesis temperature on both the composition and topology of the Mo-POM blocks is highlighted.

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“…For related structures, see: Allis et al (2004); Bridgeman (2002); Kalpana & Vidyasagar (2005). For the ligand synthesis, see: Ma et al (2003).…”

Section: Related Literaturementioning

confidence: 99%

“…All anions and cations are linked each other in this mode to give a three-dimensional supramolecular structure. The Mo-O bond distances and angles are in normal range (Kalpana & Vidyasagar, 2005) (Table 1).…”

Section: Tablementioning

confidence: 99%

Bis[1,1′-(butane-1,4-diyl)diimidazolium] δ-octamolybdate(VI)

Hou

Yang

2007

Acta Cryst E

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Key indicators: single-crystal X-ray study; T = 293 K; mean (C-C) = 0.004 Å; R factor = 0.021; wR factor = 0.048; data-to-parameter ratio = 17.3.The title compound, (C 10 H 16 N 4 ) 2 [-Mo 8 O 26 ], was synthesized by a hydrothermal reaction. The structure consists of a centrosymmetric -octamolybdate anion and two 1,1 0 -(butane-1,4-diyl)bis(imidazolium) cations for charge balance. The anions and cations are linked by N-HÁ Á ÁO hydrogen bonds, generating a three-dimensional supramolecular structure. ExperimentalCrystal data (C 10 H 16 N 4 ) 2 [Mo 8 O 26 ] M r = 1568.06 Monoclinic, P2 1 =n a = 12.252 (3) Å b = 13.766 (3) Å c = 12.405 (4) Å = 100.371 (4) V = 2058.1 (9) Å 3 Z = 2 Mo K radiation = 2.45 mm À1 T = 293 (2) K 0.40 Â 0.32 Â 0.28 mm Data collection Bruker SMART APEX CCD areadetector diffractometer Absorption correction: multi-scan (SADABS; Sheldrick, 1996) T min = 0.405, T max = 0.512 12476 measured reflections 4979 independent reflections 4400 reflections with I > 2(I) R int = 0.022

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[(C₂H₅)₄N]₄[Mo₈O₂₆]: a redetermination and correction

Abstract: Key indicatorsSingle-crystal X-ray study T = 293 K Mean (C-C) = 0.031 Å R factor = 0.068 wR factor = 0.181 Data-to-parameter ratio = 15.4For details of how these key indicators were automatically derived from the article, see

Cited by 6 publications

References 8 publications

Synthesis, Characterization, and Photochromic Properties of Hybrid Organic−Inorganic Materials Based on Molybdate, DABCO, and Piperazine

Synthesis, Characterization, and Photochromic Properties of Hybrid Organic−Inorganic Materials Based on Molybdate, DABCO, and Piperazine

How Does the Synthesis Temperature Impact Hybrid Organic−Inorganic Molybdate Material Design?

Bis[1,1′-(butane-1,4-diyl)diimidazolium] δ-octamolybdate(VI)

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