Flexible Platinum(0) Coordination to a Ditungsten Ethanediylidyne

Abstract

The lithiocarbyne [W(≡CLi)(CO)2(Tp*)] (Tp*=hydrotris(3,5-dimethylpyrazol-1-yl)borate) reacts with [PtCl2(L2)] (L2=1,5-cyclo-octadiene, norbornadiene) to furnish ditungsten ethanediylidyne complexes, [W2{μ-C2Pt(L2)}(CO)4(Tp*)2], wherein a trigonal platinum(0) center unsymmetrically ligates one W≡C bond in the solid state but rapidly shimmies between the two W≡C bonds in solution. The η4-dienes are displaced by monodentate CO or isocyanide ligands to provide derivatives where both W≡C bonds coordinate to a single Pt0 center, attended by significant distortion of the WCCW spine. Show more