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Sodium rhodizonate

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Sodium rhodizonate Basic information
Sodium rhodizonate Chemical Properties
  • Melting point:300 °C
  • storage temp. Store at +15°C to +25°C.
  • form Fine Crystalline Powder
  • color Green-gray to dark green
  • Water Solubility Soluble in water.
  • Merck 14,8670
  • BRN 5181379
  • Stability:Stable. Incompatible with strong oxidizing agents.
  • CAS DataBase Reference523-21-7(CAS DataBase Reference)
Safety Information
  • Safety Statements 24/25
  • WGK Germany 3
  • HS Code 29144090
Sodium rhodizonate Usage And Synthesis
  • Chemical Propertiesdark green powder
  • UsesAs a reagent for barium and strontium.
  • Purification MethodsThe free acid is obtained by acidifiying and extracting with Et2O, drying (MgSO4), filtering, evaporating and distilling in a vacuum (b 155-160o/14mm). The free acid solidifies on cooling, and the colourless crystals can be recrystallised from tetrahydrofuran/pet ether or *C6H6. It forms a dihydrate m 130-140o. The pure di Na salt is formed by dissolving the acid in 2 equivalents of NaOH and evaporating in a vacuum. It forms violet crystals which give an orange solution in H2O that is unstable for extended periods even at 0o, and should be prepared freshly before use. Salts of rhodizonic acid cannot be purified by recrystallisation without great loss due to conversion to crotonate, so that the original material must be prepared anew if pure salt is required. It can be washed with NaOAc solution, then EtOH, to remove excess NaOAc, dried under vacuum and stored in the dark. [UV and tautomerism: Schwarzenbach & Suter Helv Chim Acta 24 617 1941, Polarography: Preisler & Berger J Am Chem Soc 64 67 1942, Souchay & Taibouet J Chim Phys 49 C108 1952, Beilstein 8 H 535, 8 II 572, 8 III 4214, 8 IV 3609.]
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