Mechanism of Heterolysis of H2 by an Unsaturated d8 Nickel Center: via Tetravalent Nickel?
摘要:
Collision of H-2 with the unusual nickel complex, (PNP)Ni+, where PNP = ((Bu2PCH2SiMe2)-Bu-t)(2)N, forms a rare dihydrogen complex of the d(8) configuration which then rearranges to heterolytically cleave the H-H bond Experimental studies support a short H/H distance in the coordinated diatomic, and DFF calculations show that the transition state for heterolysis, in spite of the fact that tills Involves an amide nitrogen located trans to the H-2, has the H/H bond fully split, and has all the geometric features of Ni(IV), but this is a local maximum, not a minimum.