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The associative mechanism of exchange entails rate-limiting attack of cyanide on [Pd(CN) 4] 2−, possibly with the intermediacy of a highly reactive pentacoordinate species [Pd(CN) 5] 3−. By comparison, the rate constant for [Ni(CN) 4 ] 2− is > 500,000 M −1− s −1 , whereas [Pt(CN) 4 ] 2− exchanges more slowly at 26 M −1 s −1 .
The [Ni(CN) 4] 2-anions are arranged in a columnar structure with Ni---Ni distances of 4.294 Å, which is well beyond the sum of the van der Waals radius of the nickel cation. [1] This columnar structure resembles those of the other [M(CN) 4] 2-anions of the heavy congeners of the group 10 metals (M = Pd, Pt).
The tetracyanonickelates contain the [Ni(CN) 4] 2− anion. This can exist in solution or in solid salts. This can exist in solution or in solid salts. The ion has cyanide groups arranged in a square around the central nickel ion.
The number of coordination bonds (coordination number) can vary from two in K[Ag(CN) 2] as high as 20 in Th(η 5-C 5 H 5) 4. [ 2 ] One of the most common coordination geometries is octahedral , where six ligands are coordinated to the metal in a symmetrical distribution, leading to the formation of an octahedron if lines were drawn between the ...
Platinocyanide, also known as tetracyanoplatinate (IUPAC), cyanoplatinate, or platinocyanate, is a polyatomic ion with the molecular formula [Pt(CN) 4] 2−.The name also applies to compounds containing this ion, which are salts of the hypothetical platinocyanic acid (sometimes platinocyanhydric acid).
n[Pt(CN) 4] 2− → ([Pt(CN) 4] 1.7−) n. 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 d z2 orbitals. [2]
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