摘要:
Reaction of Os(H)(3)ClL2(L=(PPr3)-Pr-i) with equimolar NO occurs via a detectable paramagnetic species, to form OsCl(NO)L-2 + H-2, then Os(H)(2)Cl(NO)L-2, together with the product of halogen transfer, OsHCl2(NO)L-2. For comparison, equimolar NO and the dichloride Os(H)(2)Cl2L2 react to give OsHCl2(NO)L-2. DFT(PBE) calculations on potential radical intermediates reveal cases where spin density is on NO (vs. on Os), and show how coordinated H-2 can lead to the observed halogen transfer. (c) 2007 Elsevier B.V. All rights reserved.