Tin (II) diphosphate

Structural formula
General
Surname	Tin (II) diphosphate
other names	Tin (II) pyrophosphate
Molecular formula	Sn 2 P 2 O 7
Brief description	colorless and odorless solid
External identifiers / databases
EC number	239-635-5
ECHA InfoCard	100.036.016
PubChem	16684841
Wikidata	Q4363462
properties
Molar mass	411.36 g mol −1
Physical state	firmly
density	4.009 g cm −3
Melting point	400 ° C (decomposition)
solubility	almost insoluble
safety instructions
GHS labeling of hazardous substances Caution
H and P phrases	H: 315-319-335
	P: 305 + 351 + 338
Toxicological data	3805 mg kg −1 ( LD 50 , rat , oral )
	As far as possible and customary, SI units are used. Unless otherwise noted, the data given apply to standard conditions .

Tin (II) diphosphate is a chemical compound made from tin , phosphorus and oxygen with the empirical formula Sn ₂ P ₂ O ₇ .

Extraction and manufacture

Tin (II) diphosphate is made from tin chloride and sodium pyrophosphate .

properties

Tin diphosphate is a colorless, odorless solid. It is soluble in concentrated acids. During thermal decomposition above 400 ° C, phosphorus oxides (e.g. P ₂ O ₅ ) are formed as decomposition products

use

Tin (II) pyrophosphate is used as an emulsifier for fats and oils and as a water softener in detergents and dishwashing detergents and toothpaste. It is also used in baking powder and in cheese preparation. In hydrogen peroxide , it acts as a stabilizer.

structure

The crystal structure of tin (II) pyrophosphate contains isolated P ₂ O ₇ groups and tin in the structural spaces. The compound shows a reversible phase transition at 623 K. At room temperature, the substance is present as a triclinic β-phase, while at higher temperatures the monoclinic α-phase arises.

Individual evidence

↑ ^a ^b ^c ^d ^e data sheet Tin (II) phosphate at AlfaAesar, accessed on September 1, 2015 ( PDF )(JavaScript required) .
↑ ^a ^b ^c data sheet Tin (II) pyrophosphate from Sigma-Aldrich , accessed on October 22, 2016 ( PDF ).
^ ^A ^b Dale L. Perr: Handbook of Inorganic Compounds. 2nd Edition. CRC Press, 2011, p. 399 ( limited preview in Google Book search).
↑ German Raw Materials Agency (DERA) in the Federal Institute for Geosciences and Raw Materials, Dera Rohstoffinformation (29): Tin - supply and demand until 2020. Berlin, as of March 2014, ISBN 978-3-943566-12-3 , p. 23 ( PDF ), accessed on September 1, 2015.
↑ Victoria V. Chernaya et al: Synthesis and Investigation of Tin (II) Pyrophosphate Sn ₂ P ₂ O ₇ . In: Chem. Mater. 2005, 17 (2), pp. 284-290, doi: 10.1021 / cm048463h

[alfa-1] ↑ ^a ^b ^c ^d ^e data sheet Tin (II) phosphate at AlfaAesar, accessed on September 1, 2015 ( PDF )(JavaScript required) .

[Sigma-2] ta sheet Tin (II) pyrophosphate from Sigma-Aldrich , accessed on October 22, 2016 ( PDF ).

[Dale-3] A ^b Dale L. Perr: Handbook of Inorganic Compounds. 2nd Edition. CRC Press, 2011, p. 399 ( limited preview in Google Book search).

[4] German Raw Materials Agency (DERA) in the Federal Institute for Geosciences and Raw Materials, Dera Rohstoffinformation (29): Tin - supply and demand until 2020. Berlin, as of March 2014, ISBN 978-3-943566-12-3 , p. 23 ( PDF ), accessed on September 1, 2015.

[5] Victoria V. Chernaya et al: Synthesis and Investigation of Tin (II) Pyrophosphate Sn ₂ P ₂ O ₇ . In: Chem. Mater. 2005, 17 (2), pp. 284-290, doi: 10.1021 / cm048463h