摘要
Reaction of MoCl 3 (THF) 3 with [Me 2 Si{NLi(Dipp)} 2 ] 2 (Dipp = 2,6-i-PrC 6 H 3 ) afforded a triply bonded dimolybdenum complex 1,2-Mo 2 Cl 2 [Me 2 Si(NDipp) 2 ] 2 1, spanned by two Me 2 Si[N(Dipp)] 2 ligands, thus resulting in a syn conformation. The air- and moisture-sensitive compound 1 was characterized by NMR spectroscopic, elemental, and single-crystal X-ray crystallographic analysis. Reduction of 1 by Na/Hg yielded the quadruply bonded dimeric complex Mo 2 [Me 2 Si(NDipp) 2 ] 2 2, which was also characterized by the aforementioned analytical methods. The Mo-Mo bond was determined to be 2.1784(12) Å, which is considered a long quadruple bond. In addition, density functional theory (DFT) computations on compound 2 provided insight into the intriguing Mo-Mo quadruple bond. Copyright © 2006 American Chemical Society.