Krogmann's salt
| Names | |
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IUPAC name
Dipotassium tetracyanoplatinate bromide trihydrate
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| Other names
Potassium tetracyanoplatinate bromide trihydrate
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| Identifiers | |
| Properties | |
| K2Pt(CN)4Br0.3 | |
| Molar mass | 401.3227 g/mol |
| Appearance | Copper-colored crystalline solid |
| Structure | |
| Tetragonal | |
| Square planar | |
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Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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| Infobox references | |
Krogmann's salt is a mixed-valence square planar coordination complex of platinum and cyanide bonded through linear platinum metal chains, sometimes described as molecular wires.
Although the term Krogmann’s salt most commonly refers to a platinum metal complex of the formula K2[Pt(CN)4X0.3] where X is usually bromine (or sometimes chlorine), a number of non-stoichiometric metal salts containing the anionic complex [Pt(CN)4]2− can also be characterized under the blanket term “Krogmann’s salts.”
Modeled as an infinite one-dimensional molecular chain of platinum atoms, the high anisotropy and restricted dimensionality of Krogmann’s salt and related compounds are becoming increasingly attractive properties for many facets of nanotechnology.
Krogmann’s salt was first synthesized by Dr. Klaus Krogmann in the late 1960s at the University of Stuttgart in Germany. Dr. Krogmann published the original journal article documenting the synthesis and characterization of the salt in 1969.
Krogmann’s salt is a series of partially oxidized tetracyanoplatinate complexes linked by the platinum-platinum bonds on the top and bottom faces of the planar [Pt(CN)4]n− anions. This salt forms infinite stacks in the solid state based on the overlap of the dz2orbitals.
Krogmann’s salt has a tetragonal crystal structure with a Pt-Pt distance of 2.880 angstroms, which is much shorter than the metal-metal bond distances in other planar platinum complexes such as Ca[Pt(CN)4]·5H2O (3.36 angstroms), Sr[Pt(CN)4]·5H2O (3.58 angstroms), and Mg[Pt(CN)4]·7H2O (3.16 angstroms). The Pt-Pt distance in Krogmann's salt is only 0.1 angstroms longer than in platinum metal.
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