The reactions of arachno-decaboranyl complexes L2B10H12(L = two-electron donor ligand) with some platinum(II) compounds; nuclear magnetic resonance studies and the crystal and molecular structure of [8-Cl-7,7-(PMe2Ph)2-nido-7-PtB10H11]

The reactions of arachno-6,9-(SMe2)2B10H12 and of arachno-6,9-(MeCN)2B10H12 with the complex cis-[PtCl2(PMe2Ph)2] give moderate yields of the nido-platinaundecaborane [8-Cl-7,7-(PMe2Ph)2-7-PtB10H11] which has been characterised by single-crystal X-ray diffraction analysis. Analogous reactions with the dimeric species [{PtCl2(PR3)}2](R3= Me3–nPhn, n= 0, 1, or 2), by contrast, give the nido-platinaundecaboranes [7-Cl-7-(PR3)-8-(SMe2)-7-PtB10H11] which have been characterized by single- and multiple-resonance n.m.r. spectroscopy. Additional products of the reactions include the arachno nine-vertex species 4-(MeCN)B9H13 and 4-(SMe2)B9H13.