WordNet

a salt or ester of vanadic acid; an anion containing pentavalent vanadium

Wikipedia preview

出典(authority):フリー百科事典『ウィキペディア（Wikipedia）』「2015/05/24 23:02:21」(JST)

wiki en

In chemistry, a vanadate is a compound containing an oxoanion of vanadium generally in its highest oxidation state of +5. The simplest vanadate ion is the tetrahedral, orthovanadate, VO₄³⁻ anion, which is present in e.g. sodium orthovanadate and in solutions of V₂O₅ in strong base (pH > 13 ^[1]). Conventionally this ion is represented with a single double bond, however this is a resonance form as the ion is a regular tetrahedron with four equivalent oxygen atoms.

Additionally a range of polyoxovanadate ions exist which include discrete ions and "infinite" polymeric ions.^[2] There are also vanadates, such as rhodium vanadate, RhVO₄, which has a statistical rutile structure where the Rh³⁺ and V⁵⁺ ions randomly occupy the Ti⁴⁺ positions in the rutile lattice,^[3] that do not contain a lattice of cations and balancing vanadate anions but are mixed oxides.

In chemical nomenclature when vanadate forms part of the name, it indicates that the compound contains an anion with a central vanadium atom, e.g. ammonium hexafluorovanadate is a common name for the compound (NH₄)₃VF₆ with the IUPAC name of ammonium hexafluoridovanadate(III).

Examples of vanadate ions

Some examples of discrete ions are

VO₄³⁻ "orthovanadate", tetrahedral.^[2]
V₂O₇⁴⁻ "pyrovanadate", corner shared VO₄ tetrahedra similar to dichromate ion^[2]
V₃O₉³⁻ cyclic with corner shared VO₄ tetrahedra ^[4]
V₄O₁₂⁴⁻ cyclic with corner shared VO₄ tetrahedra ^[5]
V₅O₁₄³⁻ corner shared VO₄ tetrahedra ^[6]
V₁₀O₂₈⁶⁻ "decavanadate", edge and corner shared VO₆ octahedra^[2]
V₁₂O₃₂⁴⁻^[2]
V₁₃O₃₄³⁻ fused VO₆ octahedra ^[7]
V₁₈O₄₂¹²⁻^[8]

Some examples of polymeric “infinite” ions are

[VO₃]_nⁿ⁻ in e.g. NaVO₃, sodium metavanadate^[2]
[V₃O₈]_nⁿ⁻ in CaV₆O₁₆^[9]


metavanadate chains	V₅O₁₄	decavanadate ion

In these ions vanadium exhibits tetrahedral, square pyramidal and octahedral coordination. In this respect vanadium shows similarities to tungstate and molybdate, chromium however has a more limited range of ions.

Aqueous solutions

Dissolution of vanadium pentoxide in strongly basic aqueous solution gives the colourless VO₄³⁻ ion. On acidification, this solution's colour gradually darkens through orange to red at around pH 7. Brown hydrated V₂O₅ precipitates around pH 2, redissolving to form a light yellow solution containing the [VO₂(H₂O)₄]⁺ ion. The number and identity of the oxyanions that exist between pH 13 and 2 depend on pH as well as concentration. For example, protonation of vanadate initiates a series of condensations to produce polyoxovanadate ions:^[2]

pH 9–12; HVO₄²⁻, V₂O₇⁴⁻
pH 4–9; H₂VO₄⁻, V₄O₁₂⁴⁻, HV₁₀O₂₈⁵⁻
pH 2–4; H₃VO₄, H₂V₁₀O₂₈⁴⁻

References

^ Cotton, F. Albert; Wilkinson, Geoffrey; Murillo, Carlos A.; Bochmann, Manfred (1999), Advanced Inorganic Chemistry (6th ed.), New York: Wiley-Interscience, ISBN 0-471-19957-5
^ ^a ^b ^c ^d ^e ^f ^g Greenwood, Norman N.; Earnshaw, Alan (1997). Chemistry of the Elements (2nd ed.). Butterworth-Heinemann. ISBN 0080379419.
^ Wells A.F. (1984) Structural Inorganic Chemistry 5th edition Oxford Science Publications ISBN 0-19-855370-6
^ Hamilton E. E., Fanwick P.E., Wilker J.J. (2002). "The Elusive Vanadate (V₃O₉)³⁻: Isolation, Crystal Structure, and Nonaqueous Solution Behavior". J. Am. Chem. Soc. 124 (1): 78. doi:10.1021/ja010820r.
^ G.-Y. Yang, D.-W. Gao, Y. Chen, J.-Q. Xu, Q.-X. Zeng, H.-R. Sun, Z.-W. Pei, Q. Su, Y. Xing, Y.-H. Ling and H.-Q. Jia (1998). "[Ni(C₁₀H₈N₂)₃]2[V₄O₁₂]·11H₂O". Acta Crystallographica C 54 (5): 616. doi:10.1107/S0108270197018751.
^ V. W. Day, Walter G. Klemperer, O. M. Yaghi (1989). "A new structure type in polyoxoanion chemistry: synthesis and structure of the V₅O₁₄³⁻ anion". J. Am. Chem. Soc. 111 (12): 4518. doi:10.1021/ja00194a068.
^ Hou D., Hagen K.D., Hill C.L. (1992). "Tridecavanadate, [V₁₃O₃₄]³⁻, a new high-potential isopolyvanadate". J. Am. Chem. Soc. 114 (14): 5864. doi:10.1021/ja00040a061.
^ Müller A., Sessoli R., Krickemeyer E., Bögge H., Meyer J., Gatteschi D., Pardi L., Westphal J., Hovemeier K., Rohlfing R., Döring J, Hellweg F., Beugholt C., Schmidtmann M. (1997). "Polyoxovanadates: High-Nuclearity Spin Clusters with Interesting Host-Guest Systems and Different Electron Populations. Synthesis, Spin Organization, Magnetochemistry, and Spectroscopic Studies". Inorg. Chem. 36 (23): 5239. doi:10.1021/ic9703641.
^ Jouanneau, S.; Verbaere, A.; Guyomard, D. (2003). "On a new calcium vanadate: synthesis, structure and Li insertion behaviour". Journal of Solid State Chemistry 172: 116. Bibcode:2003JSSCh.172..116J. doi:10.1016/S0022-4596(02)00164-0.

UpToDate Contents

全文を閲覧するには購読必要です。 To read the full text you will need to subscribe.

1. インスリン受容体の構造および機能 structure and function of the insulin receptor
2. 血小板生物学 platelet biology

English Journal

Vanadium bioavailability in soils amended with blast furnace slag.

Larsson MA1, Baken S2, Smolders E3, Cubadda F4, Gustafsson JP5.
Journal of hazardous materials.J Hazard Mater.2015 Oct 15;296:158-65. doi: 10.1016/j.jhazmat.2015.04.034. Epub 2015 Apr 14.
Blast furnace (BF) slags are commonly applied as soil amendments and in road fill material. In Sweden they are also naturally high in vanadium. The aim of this study was to assess the vanadium bioavailability in BF slags when applied to soil. Two soils were amended with up to 29% BF slag (containing
PMID 25917693

Simultaneous speciation analysis of chromate, molybdate, tungstate and vanadate in welding fume alkaline extracts by HPLC-ICP-MS.

Ščančar J1, Berlinger B2, Thomassen Y2, Milačič R3.
Talanta.Talanta.2015 Sep 1;142:164-9. doi: 10.1016/j.talanta.2015.04.067. Epub 2015 Apr 30.
A novel analytical procedure was developed for the simultaneous speciation analysis of chromate, molybdate, tungstate and vanadate by anion-exchange high performance liquid chromatography hyphenated to inductively coupled plasma mass spectrometry (HPLC-ICP-MS). Linear gradient elution from 100% wate
PMID 26003707

Oxalate synthesis in leaves is associated with root uptake of nitrate and its assimilation in spinach (Spinacia oleracea L.) plants.

Liu XX1, Zhou K1, Hu Y1, Jin R2, Lu LL1,3, Jin CW1,3, Lin XY1,2.
Journal of the science of food and agriculture.J Sci Food Agric.2015 Aug 15;95(10):2105-16. doi: 10.1002/jsfa.6926. Epub 2014 Oct 16.
BACKGROUND: Excessive accumulation of oxalate in numerous vegetables adversely affects their quality as food. While it is known that nitrate could effectively stimulate oxalate accumulation in many vegetables, little information is available about the mechanism of nitrate-induced oxalate accumulatio
PMID 25243598

Japanese Journal

低融点ガラスをインサート材としたガラス基板のレーザ接合技術の開発

松坂壮太,三原圭貴,千葉明,比田井洋史,森田昇
精密工学会誌 81(4), 349-355, 2015
… Laser joining between two non-alkali aluminoborosilicate glass sheets was conducted using vanadate glass frit, which had lower melting point (m. …
NAID 130005060677

A relationship between electrical conductivity and structural relaxation of 10SnO2·10Fe2O3·10P2O5·xAgI·(70 − x)V2O5 glass caused by heat-treatment

, , , , , ,
Journal of the Ceramic Society of Japan 123(1435), 121-128, 2015
A relationship between local structure, electrical conductivity (σ) and thermal property of 10SnO2·10P2O5·10Fe2O3·xAgI·(70 − x)V2O5, 10SnO2·10P2O5·10Fe2O3·xAg2O·(70 − x)V2O5 and 10SnO2·10P2O5·10Fe2O3· …
NAID 130004951119

ソーラー熱化学水素製造のための触媒開発 (特集未利用熱エネルギーの有効活用に貢献する触媒技術)

町田正人,竹島伸一
触媒 56(5), 268-273, 2014-10
NAID 40020238155

Related Pictures

★リンクテーブル★

リンク元	「バナジン酸塩」「vanadyl」「バナジン酸」「vanadic acid」
拡張検索	「orthovanadate」「sodium vanadate」「decavanadate」「metavanadate」