Publications by authors named "R Joseph Lastowski"
Article Synopsis
- The synthesis and characterization of the quadruply-bonded dimer Mo(CHNMeBH) is reported, with each molybdenum(II) center connected to two BDAM ligands, resulting in an unbridged Mo-Mo bond.
- Structural and solution NMR data, analyzed through McConnell's equation and supported by DFT calculations, reveal that ligand-induced magnetic anisotropies can distort NMR chemical shifts, leading to potential overestimations of metal-metal bond contributions.
- A new method is proposed to quantify and correct these ligand effects, suggesting that the magnetic anisotropy of the Mo-Mo quadruple bond is approximately -800 × 10 m molecule, challenging previous inflated estimates in the literature.
We describe new compounds of stoichiometry M(CHNMeBH) (M = Ti, Cr, and Co), each of which contains three chelating boranatodimethylaminomethyl (BDAM) ligands. In all three compounds, the BDAM anion, which is isoelectronic and isostructural with the neopentyl group, is bound to the metal center at one end by a metal-carbon σ bond and at the other by one three-center M-H-B interaction. The crystal structures show that the d titanium(III) compound is trigonal prismatic (or eight-coordinate, if two longer-ranged M···H interactions with the BH groups are included), whereas the d chromium(III) compound and the d cobalt(III) compounds are both -octahedral.
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