Magnus' green salt

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Magnus' green salt
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Identifiers
CAS number 13820-46-7
Properties
Molecular formula H12Cl4N4Pt2
Molar mass 600.09 g/mol
Appearance green solid
Density 3.7 g/mL
Melting point 320 °C (608 °F; 593 K)
Except where noted otherwise, data are given for materials in their standard state (at 25 °C (77 °F), 100 kPa)
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Infobox references

Magnus' green salt is the chemical compound with the formula [Pt(NH3)4][PtCl4]. This species has been of interest in materials chemistry and solid-state physics because of its one-dimensional structure. It contains a linear chain of alternating [PtCl4]2− anions and [Pt(NH3)4]2+ cations, in which the platinum atoms are separated by 3.25 Å.[1] It is a semi-conductor. The compound may be prepared by mixing aqueous solutions of [Pt(NH3)4]2+ and [PtCl4]2−, to obtain a deep green precipitate.[2] This salt was discovered by Heinrich Gustav Magnus in the early 1830s. The corresponding palladium compound ([Pd(NH3)4PdCl4] is known as "Vauquelin’s salt".

Soluble analogues of the salt can be prepared by replacing the ammonia with ethylhexylamine.[3][4]

History[edit]

Magnus' green salt was one of the first examples of a metal ammine complex. Ammonia species are very common now; they were, after all, the basis of Alfred Werner's discoveries. Magnus' green salt has the same empirical formula as cis-PtCl2(NH3)2 ("Peyrone chloride") and trans-PtCl2(NH3)2. These cis and trans compounds are molecules, whereas Magnus' green salt is a polymer.

References[edit]

  1. ^ Atoji, M.; Richardson, J. W.; Rundle, R. E. (1957). "On the Crystal Structures of the Magnus Salts, Pt(NH3)4PtCl4". J. Am. Chem. Soc. 79 (12): 3017–3020. doi:10.1021/ja01569a009. 
  2. ^ R. N. Keller "Tetrammineplatinum(II) Chloride: (Tetrammineplatinous Chloride)" Inorganic Syntheses, 1946, vol.2 , p 250–253.doi:10.1002/9780470132333.ch80
  3. ^ Caseri, W. (2004). "Derivatives of Magnus' green salt; from intractable materials to solution-processed transistors". Platinum Metals Rev. 48 (3): 91–100. doi:10.1595/147106704X1504. 
  4. ^ Bremi, J.; Caseri, W. and Smith, P. (2001). "A new compound derived from Magnus' green salt: solid state structure and evidence for platinum chains in solution". J. Mater. Chem. 11 (10): 2593–2596. doi:10.1039/b104675f.