SYNTHESIS OF THE REAGENT [NA][PT(PET3)(2)(ETA(5)-7-CB10H11)] AND PREPARATION OF THE PLATINACARBORANE COMPLEXES [PTX(PET3)(2)(ETA(5)-7-CB10H11)] (X=H, AU(PPH3), CU(PPH3), HGPH)

The salt [Na][Pt(PEt3)(2)(eta(5)-7-CB10H11)] (la) has been prepared. P rotonation affords the hydride complex [PtH-(PEt3)(2)(eta(5)-7-CB H-10 (11))] (2) while reactions with [AuCl(PPh3)], [CuCl(PPh3)](4), and [Hg ClPh] yield the dimetal compounds [PtM(PEt3)(2)(PPh3)(eta(5)-7-CB10H11 )] (3a, M = Au; 3b, M = Cu) and [PtHgPh(PEt3)(2)(eta(5)-7-CB10H11)] (3 c), respectively. The salt [N(PPh3)(2)][Pt(Co)(PPh3)(eta(5)-7-CB10H11) ] (4) has also been obtained. Single-crystal X-ray diffraction studies have been made on 2 and 3a-c. Complexes 2, 3a, and 3c have similar mo lecular structures with H, Au(PPh3), and HgPh groups, respectively, si gma-bonded to the Pt of the Pt(PEt3)(2)(eta(5)-7-CB10H11) group. In 3b , however, the copper atom of the Cu(PPh3) moiety is attached to the P t(PEt3)(2)(eta(5)-7-CB10H11) fragment both by a Pt-Cu sigma-bond and b y two exopolyhedral B-H -->-Cu donor bonds from BH groups in the open face of the nido-7-CB10H11 cage ligating the platinum. The structure o f the salt 4 has also been determined by X-ray diffraction.