Zinc pyrophosphate

Zinc pyrophosphate[1]

Names
Other names

Dizinc diphosphate

Identifiers

CAS Number

* 7446-26-6 Y

3D model (JSmol)

* Interactive image

ChemSpider |

* 56393 Y

PubChem CID

* 62641

UNII |

* 6ERT96A621 Y

InChI

* InChI=1S/H4O7P2.2Zn/c1-8(2,3)7-9(4,5)6;;/h(H2,1,2,3)(H2,4,5,6);;/q;2*+2/p-4 Y

Key: OMSYGYSPFZQFFP-UHFFFAOYSA-J Y

* InChI=1/H4O7P2.2Zn/c1-8(2,3)7-9(4,5)6;;/h(H2,1,2,3)(H2,4,5,6);;/q;2*+2/p-4

Key: OMSYGYSPFZQFFP-XBHQNQODAA

SMILES

* [Zn+2].[Zn+2].[O-]P([O-])(=O)OP([O-])([O-])=O

Properties

Chemical formula

| Zn2P2O7
Molar mass | 304.72 g/mol
Appearance  | White crystalline powder
Density | 3.75 g/cm3

Solubility in water

| Insoluble
Solubility | Soluble in dilute acids

Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).

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Infobox references

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Zinc pyrophosphate (Zn2P2O7) is an ionic inorganic chemical compound composed of Zn2+ cations and pyrophosphate anions.

## Contents

* 1 Preparation
* 2 Properties
* 3 Uses
* 4 References

## Preparation

Zinc pyrophosphate can be obtained from the thermal decomposition of zinc ammonium phosphate.[2]

2 ZnNH4PO4 → Zn2P2O7 \+ 2 NH3 \+ H2O

It can also be obtained from the reaction between sodium carbonate, zinc oxide, and ammonium dihydrogen phosphate.[3]

Na2CO3 \+ 2 ZnO + 2 (NH4)H2PO4 → Zn2P2O7 \+ 2 NaOH + 2 NH3 \+ 2 H2O + CO2

It is also produced when a strongly acidic solution of zinc sulfate is heated with sodium pyrophosphate.[4]

2 ZnSO4 \+ Na4P2O7 → Zn2P2O7 \+ 2 Na2SO4

Another method is precipitating zinc as a phosphate, then heating over 1123 K.[citation needed]

## Properties

Zinc pyrophosphate is a white crystalline solid that is insoluble in water.[5] On heating in water, it decomposes to form Zn3(PO4)2 and ZnHPO4. It crystallizes in the monoclinic system. The α-form crystallizes at low temperatures and the β-form crystallizes at high temperatures.[2][3]

## Uses

Zinc pyrophosphate is used as a pigment.[5] It is useful in gravimetric analysis of zinc.[6]

## References

1. ↑ Lide, David R. (1998), Handbook of Chemistry and Physics (87 ed.), Boca Raton, Florida: CRC Press, pp. 4–96, ISBN 0-8493-0594-2
2. ↑ 2.0 2.1 Calvo, Crispin (1965-05-01). "THE CRYSTAL STRUCTURE AND PHASE TRANSITIONS OF β-Zn 2 P 2 O 7" (in en). Canadian Journal of Chemistry 43 (5): 1147–1153. doi:10.1139/v65-152. ISSN 0008-4042.
3. ↑ 3.0 3.1 Jarboui, A.; Ben Rhaeim, A.; Hlel, F.; Guidara, K; Gargouri, M. (2010). "NMR study and electrical properties investigation of Zn2P2O7" (in en). Ionics 16 (1): 67–73. doi:10.1007/s11581-009-0333-5. ISSN 0947-7047. http://link.springer.com/10.1007/s11581-009-0333-5.
4. ↑ Ochs, Rudolf (2013). Praktikum der Qualitativen Analyse Für Chemiker · Pharmazeuten und Mediziner. Berlin, Heidelberg: Springer-Verlag. pp. 117. ISBN 978-3-662-28315-8. OCLC 860357745. https://books.google.com/books?id=1hmBBwAAQBAJ&pg=PA117.
5. ↑ 5.0 5.1 Perry, Dale L. (2016). Handbook of Inorganic Compounds (2nd ed.). Boca Raton, FL: CRC Press. pp. 469. ISBN 978-1-4398-1462-8. OCLC 759865801. https://books.google.com/books?id=SFD30BvPBhoC&pg=PA469.
6. ↑ Holleman, Arnold F.; Wiberg, Egon; Wiberg, Nils (1995). Lehrbuch der anorganischen Chemie (102nd ed.). Berlin: de Gruyter. pp. 1493. ISBN 978-3-11-012641-9. OCLC 237142268.

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* t
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Zinc compounds

Zinc(I)|

| Organozinc(I) compounds|

* Zn2(C5(CH3)5)2

|

Zinc(II)|

* Zn(N3)2
* ZnBr2
* Zn(CN)2
* ZnCl2
* Zn(ClO3)2
* ZnCrO4
* ZnF2
* ZnH2
* ZnI2
* ZnMoO4
* Zn(NO3)2
* ZnO
* ZnO2
* Zn(OH)2
* ZnS
* ZnSO4
* ZnSe
* ZnTe
* Zn2P2O7
* Zn3Sb2
* Zn3As2
* Zn3N2
* Zn3P2
* Zn3(PO4)2

| Organozinc(II) compounds|

* Zn(CH3)2
* Zn(C2H5)2
* Zn(CH(CH3)2)2
* Zn(C(CH3)3)2
* Zn(C6H5)2
* ZnCIH2I

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