Magnus' green salt
|Molar mass||600.09 g/mol|
|Melting point||320 °C (608 °F; 593 K)|
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
|what is ?)(|
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. 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. 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".
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.
- 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.
- R. N. Keller "Tetrammineplatinum(II) Chloride: (Tetrammineplatinous Chloride)" Inorganic Syntheses, 1946, vol.2 , p 250–253.doi:10.1002/9780470132333.ch80
- 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.
- 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.