پنتاکسید آنتیموان

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Antimony pentoxide
Antimony-pentoxide-xtal-1979-3D-balls.png
شناساگرها
شماره ثبت سی‌ای‌اس 1314-60-9 ✔Y
پاب‌کم 14813
کم‌اسپایدر 14129 ✔Y
جی‌مول-تصاویر سه بعدی Image 1
خصوصیات
فرمول مولکولی Sb2O5
جرم مولی 323.517 g/mol
شکل ظاهری yellow powdery solid
چگالی 3.78 g/cm3 solid
دمای ذوب 380 °C (decomposes)
انحلال‌پذیری در آب very slightly soluble
انحلال‌پذیری insoluble in نیتریک اسید
خطرات
طبقه‌بندی ئی‌یو not listed
لوزی آتش
Flammability code 1: Must be pre-heated before ignition can occur. Flash point over 93 °C (200 °F). E.g., canola oilHealth (blue): no hazard codeReactivity (yellow): no hazard codeSpecial hazards (white): no codeNFPA 704 four-colored diamond
1
به استثنای جایی که اشاره شده‌است در غیر این صورت، داده‌ها برای مواد به وضعیت استانداردشان داده شده‌اند (در 25 °C (۷۷ °F)، ۱۰۰ kPa)
 ✔Y (بررسی) (چیست: ✔Y/N؟)
Infobox references

پنتاکسید آنتیموان (به انگلیسی: Antimony pentoxide) با فرمول شیمیایی Sb۲O۵ یک ترکیب شیمیایی است. که جرم مولی آن 323.517 g/mol می‌باشد. شکل ظاهری این ترکیب، پودر زرد است.

جستارهای وابسته[ویرایش]

منابع[ویرایش]

  • «IUPAC GOLD BOOK». دریافت‌شده در ۱۸ مارس ۲۰۱۲.
Antimony pentoxide
Antimony-pentoxide-xtal-1979-3D-balls.png
Names
IUPAC name
(dioxo-λ5-stibanyl)oxy-dioxo-λ5-stibane
Other names
antimony(V) oxide
Identifiers
3D model (JSmol)
ChemSpider
ECHA InfoCard 100.013.853
Properties
Sb2O5
Molar mass 323.517 g/mol
Appearance yellow, powdery solid
Density 3.78 g/cm3, solid
Melting point 380 °C (716 °F; 653 K) (decomposes)
0.3 g/100 mL
Solubility insoluble in nitric acid
Structure
cubic
Thermochemistry
117.69 J/mol K
–1008.18 kJ/mol
Hazards
not listed
NFPA 704 (fire diamond)
Flammability code 0: Will not burn. E.g. waterHealth code 3: Short exposure could cause serious temporary or residual injury. E.g. chlorine gasReactivity code 0: Normally stable, even under fire exposure conditions, and is not reactive with water. E.g. liquid nitrogenSpecial hazards (white): no codeNFPA 704 four-colored diamond
0
3
0
NIOSH (US health exposure limits):
PEL (Permissible)
TWA 0.5 mg/m3 (as Sb)[1]
REL (Recommended)
TWA 0.5 mg/m3 (as Sb)[1]
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
☒N verify (what is ☑Y☒N ?)
Infobox references

Antimony pentoxide (molecular formula: Sb2O5) is a chemical compound of antimony and oxygen. It always occurs in hydrated form, Sb2O5·nH2O.[citation needed] It contains antimony in the +5 oxidation state.

Structure

Antimony pentoxide has the same structure as the B form of niobium pentoxide and can be derived from the rutile structure, with antimony coordinated by six oxygen atoms in a distorted octahedral arrangement. The SbO6 octahedra are corner- and edge-sharing.[2]

Antimony-pentoxide-xtal-1979-Sb-coord-3D-balls-O.png
Antimony-pentoxide-xtal-1979-O1-coord-B-3D-balls.png
Antimony-pentoxide-xtal-1979-O2&3-coord-B-3D-balls.png
Sb coordination
edge sharing
corner sharing

Preparation

The hydrated oxide is prepared by hydrolysis of antimony pentachloride; or by acidification of potassium hexahydroxoantimonate(V). It may also be prepared by oxidation of antimony trioxide with nitric acid.[3]

Uses

Antimony pentoxide finds use as a flame retardant in ABS and other plastics and as a flocculant in the production of titanium dioxide, and is sometimes used in the production of glass, paint and adhesives.[4][5]

It is also used as an ion exchange resin for a number of cations in acidic solution including Na+ (especially for their selective retentions), and as a polymerization and oxidation catalyst.

Properties and reactions

The hydrated oxide is insoluble in nitric acid, but dissolves in a concentrated potassium hydroxide solution to give potassium hexahydroxoantimonate(V), or KSb(OH)6.[6]

When heated to 700 °C (1,290 °F), the yellow hydrated pentoxide converts to an anhydrous white solid with the formula Sb6O13, containing both antimony(III) and antimony(V). Heating to 900 °C (1,650 °F) produces a white, insoluble powder of Sb2O4 in both α and β forms. The β form consists of antimony(V) in octahedral interstices and pyramidal SbIIIO4 units. In these compounds, the antimony(V) atom is octahedrally coordinated to six hydroxy groups.

The pentoxide can be reduced to antimony metal by heating with hydrogen or potassium cyanide.[7]

References

  1. ^ a b NIOSH Pocket Guide to Chemical Hazards. "#0036". National Institute for Occupational Safety and Health (NIOSH).
  2. ^ M. Jansen (March 1979). "Die Kristallstruktur von Antimon(V)-oxid". Acta Crystallogr. B. 35 (3): 539–542. doi:10.1107/S056774087900409X.
  3. ^ Pradyot Patnaik. Handbook of Inorganic Chemicals. McGraw-Hill, 2002, ISBN 0-07-049439-8
  4. ^ Bartlett, Jeffrey (1997-03-19). "Colloidal Antimony Pentoxide in Flame Retarded ABS". Nyacol Products, Inc. Archived from the original on 3 August 2006. Retrieved 2006-07-28.
  5. ^ "ANTIMONY PENTOXIDE". chemicalLAND21.com. Archived from the original on 27 August 2006. Retrieved 2006-07-28.
  6. ^ Pradyot Patnaik (2002). Handbook of Inorganic Chemicals. McGraw-Hill. p. 54. ISBN 0-07-049439-8.
  7. ^ "Antimony" in Handbook of Preparative Inorganic Chemistry, 2nd Ed. Edited by G. Brauer, Academic Press, 1963, NY. Vol. 1. p. 606.