SYNTHESIS AND STRUCTURE OF [NBU4][PT2AG(MU-SC4H8)2(C6F5)6], A TRINUCLEAR COMPOUND DISPLAYING 2 STRUCTURALLY DIFFERENT ANIONS IN THE SOLID-STATE

The result of the reaction between [NBu4][Pt(C6F5)3(tht)] (tht = SC4H8, tetrahydrothiophene) and AgClO4 in CH2Cl2 is a trinuclear anionic complex which has been isolated in the form of its tetrabutylammonium salt [NBu4][Pt2-Ag(mu-tht)2(C6F5)6] (1). Pt2AgC60F30H52NS2 is triclinic, space group P1, with a = 13.486(3) angstrom, b = 14.697(4) angstrom, c = 17.333(4) angstrom, alpha = 106.01(2)degrees, beta = 90.50(2)degrees, gamma = 98.03(3)degrees, V = 3262.4(13) angstrom, and Z = 2. As a unique proof of the concerted nature of the electronic effects operating at the aceptor silver center, the asymmetric unit contains two independent half-anions (lying on centers of inversion) with different bond distances in their cores: anion 1a, Pt-Ag = 2.783(1) angstrom and Ag-S = 2.778(2) angstrom; anion 1b, Pt-Ag = 2.862(1) angstrom and Ag-S = 2.547(2) angstrom. H-1 and F-19 NMR spectra point to dynamic behavior in solution of the complex anion.