Silver dichromate

Silver dichromate
Names
	IUPAC name Silver dichromate
Identifiers
CAS Number	7784-02-3;
3D model (JSmol)	Interactive image;
ChemSpider	8108122;
ECHA InfoCard	100.029.131
EC Number	232-044-3;
PubChem CID	9932493;
UNII	S8F2648XD9 ;
CompTox Dashboard (EPA)	DTXSID80228462 ;
	InChI InChI=1S/2Cr.2Ag.7O/q;;2+1;;;;;;2-1; InChI=1/2Cr.2Ag.7O/q;;2+1;;;;;;2-1/rCr2O7.2Ag/c3-1(4,5)9-2(6,7)8;;/q-2;2*+1;
	SMILES [Ag+].[Ag+].[O-][Cr](=O)(=O)O[Cr]([O-])(=O)=O;
Properties
Chemical formula	Ag2Cr2O7
Molar mass	431.76 g/mol
Appearance	ruby red powder
Density	4.77 g/cm3
Solubility in water	Ksp = 2.0×10−7
	Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). Infobox references

Silver dichromate is a chemical compound with the formula Ag₂Cr₂O₇. It is insoluble in water and decomposes when treated with hot water. Its anion has a charge of -2.

Synthesis

Silver dichromate can be precipitated by reacting potassium dichromate with silver nitrate:

K₂Cr₂O₇ + 2 AgNO₃ → Ag₂Cr₂O₇ + 2 KNO₃

Nanostructures can be produced via a sonochemical method using silver salicylate and ammonium dichromate as precursors.^[1]

Applications

Related complexes are used as oxidants in organic chemistry.^[2] For instance, tetrakis(pyridine)silver dichromate, [Ag₂(py)₄]²⁺[Cr₂O₇]²⁻, is used to convert benzylic and allylic alcohols to corresponding carbonyl compounds.^[3]

Dichromate solutions containing silver ions have been investigated for use in dosimetry.^[4]^[5]

References

↑ Soofivand, Faezeh; Mohandes, Fatemeh; Salavati-Niasari, Masoud (2013-06-01). "Silver chromate and silver dichromate nanostructures: Sonochemical synthesis, characterization, and photocatalytic properties". Materials Research Bulletin. 48 (6): 2084–2094. doi:10.1016/j.materresbull.2013.02.025. ISSN 0025-5408.
↑ Firouzabadi, H.; Seddighi, M.; Ahmadi, Z. Arab; Sardarian, A. R. (1989). "Selective Oxidative Cleavage of Benzylic Carbon-Nitrogen Double Bonds Under Non-Aqueous Condition with Tetrakis(pyridine)-Silver Dichromate [(Py)₂Ag]₂Cr₂O₇". Synthetic Communications. 19 (19): 3385. doi:10.1080/00397918908052745.
↑ Firouzabadi, H.; Sardarian, A.; Gharibi, H. (1984). "Tetrakis (Pyridine)silver Dichromate Py₄Ag₂Cr₂0₇ - A Mild and Efficient Reagent for the Conversion of Benzylic and Allylic Alcohols to Their Corresponding Carbonyl Compounds". Synthetic Communications. 14: 89–94. doi:10.1080/00397918408060869.
↑ Matthews, Ralph W. (1981-12-01). "Effect of Silver ions in dichromate dosimetry". The International Journal of Applied Radiation and Isotopes. 32 (12): 861–867. doi:10.1016/0020-708X(81)90069-7. ISSN 0020-708X.
↑ Mai, Hoang Hoa; Duong, Nguyen Dinh (1995-08-01). "Silver dichromate - a suitable dosimeter for radiation processing". {{cite journal}}: Cite journal requires |journal= (help)

General references

Greenwood, Norman N.; Earnshaw, Alan (1997). Chemistry of the Elements (2nd ed.). Butterworth-Heinemann. doi:10.1016/C2009-0-30414-6. ISBN 978-0-08-037941-8.^{[page needed]}

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[1] Soofivand, Faezeh; Mohandes, Fatemeh; Salavati-Niasari, Masoud (2013-06-01). "Silver chromate and silver dichromate nanostructures: Sonochemical synthesis, characterization, and photocatalytic properties". Materials Research Bulletin. 48 (6): 2084–2094. doi:10.1016/j.materresbull.2013.02.025. ISSN 0025-5408.

[2] Firouzabadi, H.; Seddighi, M.; Ahmadi, Z. Arab; Sardarian, A. R. (1989). "Selective Oxidative Cleavage of Benzylic Carbon-Nitrogen Double Bonds Under Non-Aqueous Condition with Tetrakis(pyridine)-Silver Dichromate [(Py)₂Ag]₂Cr₂O₇". Synthetic Communications. 19 (19): 3385. doi:10.1080/00397918908052745.

[3] Firouzabadi, H.; Sardarian, A.; Gharibi, H. (1984). "Tetrakis (Pyridine)silver Dichromate Py₄Ag₂Cr₂0₇ - A Mild and Efficient Reagent for the Conversion of Benzylic and Allylic Alcohols to Their Corresponding Carbonyl Compounds". Synthetic Communications. 14: 89–94. doi:10.1080/00397918408060869.

[4] Matthews, Ralph W. (1981-12-01). "Effect of Silver ions in dichromate dosimetry". The International Journal of Applied Radiation and Isotopes. 32 (12): 861–867. doi:10.1016/0020-708X(81)90069-7. ISSN 0020-708X.

[5] Mai, Hoang Hoa; Duong, Nguyen Dinh (1995-08-01). "Silver dichromate - a suitable dosimeter for radiation processing". {{cite journal}}: Cite journal requires |journal= (help)

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