Strontium hydrogen phosphate

Crystal structure
	__ Sr 2+ __ P 5+ __ O 2−
Crystal system	triclinic
Space group	P 1 (No. 2)
Lattice parameters	a = 7.184 Å , b = 6.790 Å, c = 7.256 Å, α = 94.68 °, β = 104.97 °, γ = 88.77 °
General
Surname	Strontium hydrogen phosphate
Ratio formula	Sr (HPO 4 )
Brief description	White dust
External identifiers / databases
EC number	236-615-8
ECHA InfoCard	100.033.273
PubChem	10197964
Wikidata	Q58213391
properties
Molar mass	183.60 g mol −1
density	3.55 g cm −3
Melting point	Decomposition at> 350 ° C
solubility	practically insoluble in water (62.1 mg l −1 at 20 ° C)
safety instructions
GHS labeling of hazardous substances	no GHS pictograms
	no GHS pictograms
H and P phrases	H: no H-phrases
	P: no P-phrases
	As far as possible and customary, SI units are used. Unless otherwise noted, the data given apply to standard conditions .

Strontium hydrogen phosphate , Sr (HPO ₄ ), is the strontium salt of phosphoric acid in the form of a hydrogen phosphate .

presentation

SrHPO ₄ can be prepared by reacting strontium chloride with diammonium hydrogen phosphate .

{\ displaystyle {\ ce {SrCl2 + (NH4) 2HPO4 -> SrHPO4 + 2NH4Cl}}}

properties

Strontium hydrogen phosphate is a white, crystalline solid that is neither combustible nor forms explosive dust. However, the substance decomposes when heated above 350 ° C.

The connection is available in three different modifications . According to the above synthesis, the α-modification is obtained at below 25 ° C., the β-modification at over 40 ° C., while a mixture of both modifications is formed in between. There is also a γ modification.

α-SrHPO ₄ crystallizes in the space group P 1 (space group no. 2) with the lattice constants a = 7.184 Å , b = 6.790 Å, c = 7.256 Å, α = 94.68 °, β = 104.97 ° and γ = 88.77 ° The γ-modification on the other hand forms orthorhombic crystals in the space group Pbca (space group no. 61) . The lattice constants for this modification are a = 8.313 Å, b = 9.259 Å, c = 18.085 Å. Template: room group / 2 Template: room group / 61

use

The compound mostly serves as a starting material for the synthesis of phosphors such as divalent tin doped Sr ₂ P ₂ O ₇ .

{\ displaystyle {\ ce {2Sr (HPO4) -> [\ Delta] Sr2P2O7 + H2O}}}

The use of rare earth doped SrHPO ₄ as a diode is being investigated.

The compound is also the subject of medical research, particularly in the therapy of osteoporosis . This is due to the similar ion size and chemical behavior of strontium compared to calcium. One study came to the result that clusters of β-SrHPO _{4 are} a suitable carrier for calcium phosphate in osteoporosis therapy. The use of strontium hydrogen phosphate to bind Pb ²⁺ ions is also being investigated.

Individual evidence

↑ ^a ^b ^c ^d ^e ^f Entry on strontium hydrogen phosphate in the GESTIS substance database of the IFA , accessed on November 4, 2018 (JavaScript required)

↑ A. Boudjada, R. Masse, JC Guitel: Structure cristalline de l'orthophosphate monoacide de strontium: SrHPO ₄ α: forme triclinique . In: Acta Crystallographica Section B . tape 34 , 1978, p. 2692–2695 , doi : 10.1107 / S0567740878009036 (French).

↑ Lotfi Ben Taher et al. : Investigation of the Alkaline Earth Phosphates . Synthesis and Crystal Structure of a New Strontium Hydrogen Phosphate Form. In: Journal of Solid State Chemistry . tape 52 , 2000, pp. 428-434 , doi : 10.1006 / jssc.2000.870 .

^ Richard C. Ropp: Encyclopedia of the Alkaline Earth Compounds . Newnes, 2012, ISBN 978-0-444-59553-9 , 4.2, pp. 255–266 ( limited preview in Google Book Search [accessed November 4, 2018]). }

↑ Mengan Wang et al. : Crystal structure, morphology and luminescent properties of rare earthion-doped SrHPO ₄ nanomaterials . In: Journal of Rare Earths . tape 33 , no. 4 , April 2015, p. 355-360 , doi : 10.1016 / S1002-0721 (14) 60426-9 .

↑ Haisan Shi et al. : Biocompatible β-SrHPO ₄ clusters with dandelion-like structure as an alternative drug carrier. In: Materials Science and Engineering C . tape 81 , December 1, 2017, p. 8-12 , doi : 10.1016 / j.msec.2017.07.034 .

↑ Lu Zhenzhen et al. : Facile Synthesis of β-SrHPO ₄ with Wide Applications in the Effective Removal of Pb ²⁺ and Methyl Blue . In: Journal of Chemical & Engineering data . 7th August 2017.

[GESTIS-1] ↑ ^a ^b ^c ^d ^e ^f Entry on strontium hydrogen phosphate in the GESTIS substance database of the IFA , accessed on November 4, 2018 (JavaScript required)

[2] A. Boudjada, R. Masse, JC Guitel: Structure cristalline de l'orthophosphate monoacide de strontium: SrHPO ₄ α: forme triclinique . In: Acta Crystallographica Section B . tape 34 , 1978, p. 2692–2695 , doi : 10.1107 / S0567740878009036 (French).

[3] Lotfi Ben Taher et al. : Investigation of the Alkaline Earth Phosphates . Synthesis and Crystal Structure of a New Strontium Hydrogen Phosphate Form. In: Journal of Solid State Chemistry . tape 52 , 2000, pp. 428-434 , doi : 10.1006 / jssc.2000.870 .

[encyclopedia-4] Richard C. Ropp: Encyclopedia of the Alkaline Earth Compounds . Newnes, 2012, ISBN 978-0-444-59553-9 , 4.2, pp. 255–266 ( limited preview in Google Book Search [accessed November 4, 2018]). }

[5] Mengan Wang et al. : Crystal structure, morphology and luminescent properties of rare earthion-doped SrHPO ₄ nanomaterials . In: Journal of Rare Earths . tape 33 , no. 4 , April 2015, p. 355-360 , doi : 10.1016 / S1002-0721 (14) 60426-9 .

[6] Haisan Shi et al. : Biocompatible β-SrHPO ₄ clusters with dandelion-like structure as an alternative drug carrier. In: Materials Science and Engineering C . tape 81 , December 1, 2017, p. 8-12 , doi : 10.1016 / j.msec.2017.07.034 .

[7] Lu Zhenzhen et al. : Facile Synthesis of β-SrHPO ₄ with Wide Applications in the Effective Removal of Pb ²⁺ and Methyl Blue . In: Journal of Chemical & Engineering data . 7th August 2017.