Nickel (II) diphosphate

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Crystal structure
Unit cell of the α modification
__ Ni 2+ __ P 5+ __ O 2−
Crystal system

monoclinic

Space group

B 2 1 / c (No. 14, position 5)Template: room group / 14.5

General
Surname Nickel (II) diphosphate
other names
  • Nickel pyrophosphate
  • Dinickel diphosphate
Ratio formula Ni 2 P 2 O 7
External identifiers / databases
CAS number 14448-18-1
EC number 238-426-6
ECHA InfoCard 100.034.917
PubChem 167099
Wikidata Q18212008
properties
Molar mass 291.32 g mol −1
Physical state

firmly

Melting point

1395 ° C

safety instructions
GHS labeling of hazardous substances
08 - Dangerous to health 09 - Dangerous for the environment

danger

H and P phrases H: 350i-372-334-317-410
P: ?
As far as possible and customary, SI units are used. Unless otherwise noted, the data given apply to standard conditions .

Nickel (II) diphosphate is an inorganic chemical compound of nickel from the group of diphosphates .

Extraction and presentation

The yellow nickel diphosphate can be obtained by reacting phosphorus pentoxide with nickel (II) oxide . Its yellow hexahydrate can be obtained by reacting sodium pyrophosphate solution with a nickel salt.

It can also be obtained by decomposing nickel hydrogen phosphate .

Or by thermal decomposition of the easily produced ammonium nickel phosphate hydrate .

properties

Four different crystal structures are known of nickel diphosphate. The normal temperature form is isotypic to that of the corresponding magnesium salt with the space group B 2 1 / c (space group no. 14, position 5) . The high-temperature form that develops from 565 ° C is isotypic to thortveitite with the space group C 2 / m (space group no. 12) . The γ form is isotypic to that of the corresponding zinc salt. The fourth form has a monoclinic crystal structure with the space group P 2 1 / a (space group no. 14, position 3) . Template: room group / 14.5 Template: room group / 12 Template: room group / 14.3

use

Nickel diphosphate has been used as a catalyst in organic chemistry.

Related links

In addition to nickel diphosphate, other nickel phosphates are known with the green nickel orthophosphate Ni 3 (PO 4 ) 2 · 8H 2 O.

Individual evidence

  1. ↑ a b The numbering of this axis position does not correspond to the order of the International Tables for Crystallography , because it is not listed there.
  2. ↑ a b Entry for CAS no. 14448-18-1 in the GESTIS substance database of the IFA , accessed on July 10, 2016(JavaScript required) .
  3. ↑ a b c A. Durif: Crystal Chemistry of Condensed Phosphates . Springer Science & Business Media, 2013, ISBN 978-1-4757-9894-4 , pp. 22 ( limited preview in Google Book search).
  4. ↑ atomistry.com: Nickel Pyrophosphate, Ni2P2O7 , accessed July 10, 2016
  5. ↑ Hiroaki Onoda, Takeshi Sakumura: Synthesis and Pigmental Properties of Nickel Phosphates by the Substitution with Tetravalent Cerium Cation. In: Materials Sciences and Applications. 02, 2011, p. 1578, doi : 10.4236 / msa.2011.211211 .
  6. ↑ R. Masse, JC Guitel, A. Durif: Structure cristalline d'une nouvelle variete de pyrophosphate de nickel: Ni2P2O7. In: Materials Research Bulletin. 14, 1979, p. 337, doi : 10.1016 / 0025-5408 (79) 90098-9 .
  7. ↑ Yoshiaki OBANA, Kazuya ETO, Masami ITO, Qing XIA, Hiroyasu NISHIGUCHI, Tatsumi ISHIHARA, Yusaku TAKITA: Selective Oxidation of Isobutane to Methacrolein by the Combined Oxide Catalysts, Ni2P2O7 for Oxidative Dehydrogenation of Alkanes and Bi-Mo-Oxide. In: Journal of the Japan Petroleum Institute. 45, 2002, p. 375, doi : 10.1627 / jpi.45.375 .
  8. ↑ D. Nicholls: The Chemistry of Iron, Cobalt and Nickel Comprehensive Inorganic Chemistry . Elsevier, 2013, ISBN 978-1-4831-4643-0 , pp. 1131 ( limited preview in Google Book search).