Hexachloroplatinic acid

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Structural formula
2 Structure of the H + ion   Structure of the hexachloroplatinate ion
General
Surname Hexachloroplatinic acid
other names
  • Dihydrogen hexachloroplatinate (IV)
  • Chloroplatinic acid
  • Hexachloroplatinic acid
Molecular formula
  • H 2 [PtCl 6 ] (anhydrous acid)
  • H 2 [PtCl 6 ] · 6 H 2 O (hexahydrate)
Brief description

orange-colored, odorless, crystalline solid

External identifiers / databases
CAS number
  • 16941-12-1 (anhydrous)
  • 18497-13-7 (hexahydrate)
EC number 241-010-7
ECHA InfoCard 100.037.267
PubChem 61859
Wikidata Q411467
properties
Molar mass 409.81 g mol −1 (anhydrous)

517.90 g mol −1 (hexahydrate)

Physical state

firmly

density
  • 2.4 g cm −3 (anhydrous)
  • 4 g cm −3 (hexahydrate)
Melting point
  • 60 ° C (anhydrous)
  • 150 ° C (hexahydrate)
solubility

soluble in water

safety instructions
GHS hazard labeling from  Regulation (EC) No. 1272/2008 (CLP) , expanded if necessary
06 - Toxic or very toxic 05 - Corrosive 08 - Dangerous to health 09 - Dangerous for the environment

danger

H and P phrases H: 301-314-317-334-410
P: 280-270-302 + 352-305 + 351 + 338-301 + 310
As far as possible and customary, SI units are used. Unless otherwise noted, the data given apply to standard conditions .

Hexachloroplatinic acid H 2 [PtCl 6 ] is a chemical compound . Pure hexachloroplatinic acid is a yellow to slightly orange, strongly hygroscopic substance that dissolves in the air. If the iridium impurities are often minimal , the color varies from red to brown or is even darker. The salts of hexachloroplatinic acid are known as hexachloroplatinates .

presentation

Hexachloroplatinic acid crystals H 2 [PtCl 6 ] · 6 H 2 O

Hexachloroplatinic acid can be represented by oxidative dissolution of platinum in aqua regia :

Platinum dissolves in aqua regia to form hexachloroplatinic acid.

The hexachloroplatinic acid hexahydrate H 2 [PtCl 6 ] · 6 H 2 O is formed from aqueous solution and can be dehydrated down to the dihydrate. In addition, it decomposes into water, hydrochloric acid and platinum tetrachloride , since the protons of the oxonium ions do not find a suitable coordination point on the [PtCl 6 ] 2− ion after the water has been withdrawn .

Salts

When the acid reacts with various cations such as potassium (K + ), rubidium (Rb + ), cesium (Cs + ), ammonium (NH 4 + ), silver (Ag + ) and thallium (Tl + ), poorly soluble yellow precipitates are formed of the general formula M 2 [PtCl 6 ], the hexachloroplatinates.

use

Hexachloroplatinic acid is the starting compound for the synthesis of platinum-containing cytostatics , e.g. B. cisplatin , oxaliplatin or carboplatin . Hexachloroplatinic acid is used to produce catalysts by impregnating carrier substances, for example for the three-way catalyst or for catalytic reforming . The distribution of the metal on the carrier can be adjusted by choosing the impregnation conditions.

See also

Individual evidence

  1. ↑ a b c d e Entry on hexachloroplatinic acid in the GESTIS substance database of the IFA , accessed on January 8, 2018(JavaScript required) .
  2. ↑ a b c d Datasheet Hexachloroplatinic acid hexahydrate (PDF) from Carl Roth , accessed on February 3, 2018.
  3. ↑ Entry on Hexachloroplatinic acid in the Classification and Labeling Inventory of the European Chemicals Agency (ECHA), accessed on February 1, 2016. Manufacturers or distributors can expand the harmonized classification and labeling .
  4. ^ Harry H. Binder: Lexicon of the chemical elements , S. Hirzel Verlag, Stuttgart 1999, ISBN 3-7776-0736-3 .
  5. ^ A b A. F. Holleman , E. Wiberg , N. Wiberg : Textbook of Inorganic Chemistry . 91st – 100th, improved and greatly expanded edition. Walter de Gruyter, Berlin 1985, ISBN 3-11-007511-3 .
  6. ↑ Th. Mang, B. Breitscheidel, P. Polanek, H. Knözinger: Adsorption of platinum complexes on silica and alumina: Preparation of non-uniform metal distributions within support pellets. In: Applied Catalysis A: General. 106, 1993, pp. 239-258, doi : 10.1016 / 0926-860X (93) 80180-X .