Rare-Earth Supported Nickel Catalysts for Alkyne Semihydrogenation: Chemo- and Regioselectivity Impacted by the Lewis Acidity and Size of the Support.

Bimetallic catalysts of nickel(0) with a trivalent rare-earth ion or Ga(III), NiML (where L is [PrPCHNPh], and M is Sc, Y, La, Lu, or Ga), were investigated for the selective hydrogenation of diphenylacetylene (DPA) to ()-stilbene. Each bimetallic complex features a relatively short Ni-M bond length, ranging from 2.3395(8) Å (Ni-Ga) to 2.

Multiple Bonds in Uranium-Transition Metal Complexes.

Novel heterobimetallic complexes featuring a uranium atom paired with a first-row transition metal have been computationally predicted and analyzed using density functional theory and multireference wave function based methods. The synthetically inspired metalloligands U{(PrPCHNAr)tacn} () and U(PrPCHNPh) () are explored in this study. We report the presence of multiple bonds between uranium and chromium, uranium and manganese, and uranium and iron.

Bimetallic nickel-lutetium complexes: tuning the properties and catalytic hydrogenation activity of the Ni site by varying the Lu coordination environment.

We present three heterobimetallic complexes containing an isostructural nickel center and a lutetium ion in varying coordination environments. The bidentate and nonadentate ligands were used to prepare the Lu metalloligands, Lu(PrPCHNPh) () and Lu{(PrPCHNAr)tacn} (), respectively. Reaction of Ni(COD) (where COD is 1,5-cyclooctadiene) and afforded NiLu(PrPCHNPh) (), with a Lu coordination number (CN) of 4 and a Ni-Lu distance, (Ni-Lu), of 2.