MIXED-VALENCE MOLECULAR PLATINUM IODIDE AMINE COMPLEXES - THE TRINUCLEAR PT3I8(NHET2)(2) WITH EDGESHARED PLANAR AND OCTAHEDRAL BUILDING GROUPS

PtI2 . NHEt2 was prepared by reaction of K2PtCl4 with KI and NEt2H in aqueous solution. The crystal structure of the monoclinic compound (a= 20.558(4) Angstrom; b=7.254(1) Angstrom; c=13.790(3) Angstrom; beta=10 0.47(3)degrees; space group C2/ c) consists of binuclear molecules of [{Pt(NH(Et)(2))I}(2)(mu-I)(2)]. On oxidation of this Pt(II) compound b y I-2 in CH2Cl2 mixtures of the trinuclear mixed-valence compound Pt3I 8(NHEt2)(2) and of the binuclear Pt-IV complex [{Pt(NHEt2)I-3}(2)(mu-I )(2)] were obtained. The monoclinic crystal structure of Pt3I8(NHEt2)( 2) (a = 20.278(4) Angstrom; b = 10.627(2) Angstrom, c = 14.232(3) Angs trom; beta = 115.66(3)degrees space group C2/c) is built up by trimeri c units of two planar (PtI3)-I-II(NHEt2) groups sharing edges with a c entral (PtI6)-I-IV-octhedron.