Hexanuclear complexes [Pt2Ag4(C≡CR)8] [R = Ph (1) or But (2)] have been obtained by treating [PtCl2(tht)2] (tht = tetrahydrothiophene) with [Ag(C≡CR)]n(Pt/Ag 1: 4). The complexes [Pt2M4(C≡CR)8] [M = Cu, R = Ph (3) or But (4); M = Au, R = But (5)] were obtained from [Pt2Ag4(C≡CR)8] with CuCl or [AuCl(tht)] respectively. Alternatively, the reactions between [NBu4]2[Pt(C≡CR)4] and AgClO4, CuCl-NaClO4, or [AuCl(tht)]-NaClO4 yield respectively complexes (1)-(5). The molecular structure of [Pt2Ag4(C≡CBut)8] has been determined by an X-ray diffraction study: monoclinic, space group C2 with a = 37.062(7), b = 12.0223(16), c = 20.459(3) Å, β = 107.485(15)°, Z = 6, R 0.0416, R′ 0.0465 for 5 613 reflections with F > 6σ(F). The six metal atoms are arranged in a slightly irregular octahedron with the platinum atoms mutually trans and the silver atoms in the equatorial plane, with Pt ⋯ Ag and Ag ⋯ Ag distances longer than 3.0 Å. Each platinum atom is in an almost square-planar environment formed by four C≡CBut ligands. Each acetylenic fragment also forms an asymmetric π interaction with one silver atom of the equatorial positions so that each silver atom is bonded to two acetylenic fragments, of two different Pt(C≡CBut), moieties. These moieties of each [Pt2Ag4(C≡CBut)8] unit are staggered.
|Number of pages||8|
|Journal||Journal of the Chemical Society, Dalton Transactions|
|Publication status||Published - 1990|
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