Structural Principles in the Chemistry of Heteropolycompounds

Kazanskii, L. P.; Torchenkova, E.A.; Spitsyn, V.I.

doi:10.1070/rc1974v043n07abeh001828

Cited by 26 publications

(10 citation statements)

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“…Kazanskii participated prominently in writing five reviews: (1) “Structural principles in the chemistry of heteropoly compounds” (191 references); (2) “Vibrational spectra of heteropolyanions of different structural types” (53 references); (3) “Electrochemical methods in analytical chemistry of heteropoly species” (171 references); (4) “Current structural and spectroscopic investigations of heteropoly compounds” (212 references); (5) “Molecular, electron, and proton composition of heteropoly compounds of various types of structures” (239 refs)…”

Section: Vadim F Chuvaev Leonid P Kazanskii and Viktor I Spitsynmentioning

confidence: 99%

Present General Status of Understanding of Heteropoly Electrolytes and a Tracing of Some Major Highlights in the History of Their Elucidation

1998

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Section: Vadim F Chuvaev Leonid P Kazanskii and Viktor I Spitsynmentioning

confidence: 99%

Present General Status of Understanding of Heteropoly Electrolytes and a Tracing of Some Major Highlights in the History of Their Elucidation

1998

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“…It has been established experimentally that heteropolyanions are stable at pH values up to about 6 [19]. Structural investigations have shown that 12 ligands of the type of are coordinated around the complex-former, particularly silica.…”

Section: Physicochemical Model Of Combined Transport Of Vein and Ore mentioning

confidence: 98%

“…These elements can serve as INTERNATIONAL GEOLOGY REVIEW "bridges" for the formation of more complex ions of the dimer type. The silicon-wolframate HPA in particular is capable of coordinating Fe, Mn, V, Ti, Sn, Sc, REE, Nb, and Ta in theirouter spheres [19]. The destruction of such HPA will naturally lead to crystallization of quartz and wolframite, which incorporate these elements.…”

Section: Physicochemical Model Of Combined Transport Of Vein and Ore mentioning

confidence: 99%

A Physicochemical Model of the Transport of Mineral Material by Hydrothermal Solutions

Ganeyev¹

1985

International Geology Review

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“…Polymer species of oxo compounds of tung sten, molybdenum, vanadium, and niobium act as ligands in HPCs; about 50 elements of the Periodic Table can act as central atoms [2,3]. Island like struc tures, high symmetries of discrete polyatomic het eropolyanions (HPAs), high surface areas, and rela tively low negative charges provide for unique physic ochemical properties of HPCs [4,5]. Among these compounds, ammonium and sodium decavanadates [6], as well as synthetic analogues of pascoite (Ca 3 X ray crystallography of compound I was carried out on an Enraf Nonius CAD 4 automatic diffracto meter (MoK α radiation, λ = 0.71073 Å) at room tem perature.…”

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confidence: 99%

Synthesis, crystal structure, and thermal analysis of hexahydrogen dodecavanadate of composition [NH3 · H2O]6 · H6[Ca4V12O40] · 6H2O

Stepnova

Oreshkina

Kaziev

et al. 2012

Russ. J. Inorg. Chem.

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783Over many years, heteropoly compounds (HPCs) have been of scientific interest for a number of researchers in the fields of chemistry, physics, and bio chemistry [1]. HPCs are a class of coordination com pounds that are unique and interesting in theoretical terms. Polymer species of oxo compounds of tung sten, molybdenum, vanadium, and niobium act as ligands in HPCs; about 50 elements of the Periodic Table can act as central atoms [2, 3]. Island like struc tures, high symmetries of discrete polyatomic het eropolyanions (HPAs), high surface areas, and rela tively low negative charges provide for unique physic ochemical properties of HPCs [4, 5]. Among these compounds, ammonium and sodium decavanadates [6], as well as synthetic analogues of pascoite (Ca 3 V 10 O 28 ⋅ 16H 2 O) and hummerite (K 2 Mg 2 V 10 O 28 ⋅ 16H 2 O) minerals of composition A 2 B 2 V 10 O 28 ⋅ nH 2 O, where A = NH 4 , Na, K; B = Ca, Mg [7], have been best studied. This work was devoted to the synthesis, X ray crys tallography, and TGA of hexahydrogen dodecavana date of composition [NH 3 ⋅ H 2 О] 6 ⋅ H 6 [Cа 4 V 12 O 40 ] ⋅ 6H 2 O (I). EXPERIMENTAL Compound I was synthesized in a flask with a back flow condenser at 90-95°С for 5 h under constant stir ring. To a hot ammonium vanadate solution (60°С), was added calcium nitrate solution (in the ratio 3 : 1). Following the cooling procedure, the solution was placed into a desiccator. Dark brown crystals of I pre cipitated in several days. The chemical composition of compound I was determined by mass spectrometry. For [NH 3 · H 2 O] 6 · H 6 [Ca 4 V 12 O 12 ] · 6H 2 O anal. calcd. (wt %): N, 4.92; Ca, 9.38; V, 35.32; O, 48.38. Found (wt %): N, 4.83; Ca, 9.21; V, 35.25; O, 47.92.X ray crystallography of compound I was carried out on an Enraf Nonius CAD 4 automatic diffracto meter (MoK α radiation, λ = 0.71073 Å) at room tem perature. The crystallographic data and structure refinement details are listed in Table 1. After direct determination of the structure, it was refined using the least squares procedure with respect to F 2 in the aniso tropic (anisotropic for hydrogen atoms) approxima tion using the SHELX 97 software package. Selected bond lengths and bond angles are listed in Table 2.Atom coordinates and other structural parameters were deposited with the FIZ Karlsruhe (no. 423107; http://www.fiz karlsruhe.de/icsd.html).TGA of compound I was carried out on a Paulik Paulik Erdey instrument within the 20-1000°С range at a heating rate of 10 K/min; thes ampel size was 10 mg weight portions; calcined alumina was the ref erence. RESULTS AND DISCUSSIONThe structure of I consists of a discrete complex HPA Н 6 [Cа 4 V 12 O 40 ] 6-, six hydrated ammonium cat ions (NH 3 ⋅ H 2 О) + , and six crystal water molecules.The HPA [Cа 4 V 12 O 40 ] 12- (Fig. 1) is based on 12 dis torted VO 6 vanadium-oxygen octahedra and four CaO metal-oxygen octahedra. Vanadium atoms are displaced from the equatorial planes of their octahedra towards the terminal O(4) atoms. Each VO 6 octahe dron comprises one terminal atom O(4); i...

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Structural Principles in the Chemistry of Heteropolycompounds

Cited by 26 publications

References 1 publication

Present General Status of Understanding of Heteropoly Electrolytes and a Tracing of Some Major Highlights in the History of Their Elucidation

Present General Status of Understanding of Heteropoly Electrolytes and a Tracing of Some Major Highlights in the History of Their Elucidation

A Physicochemical Model of the Transport of Mineral Material by Hydrothermal Solutions

Synthesis, crystal structure, and thermal analysis of hexahydrogen dodecavanadate of composition [NH3 · H2O]6 · H6[Ca4V12O40] · 6H2O

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