Low-coordinate Transition Metal Amides

The range of transition metal silylamides was also expanded to include the synthesis and structure of the yttrium species [Y N(SiMe3)2 3],2 which, like its previously reported scandium counterpart, has a pyramidal MN3 array. In the vapor phase, the 

R = R = Cy R = 1-adamantyl, R = CfiH 5. Te2-3,5 5 ). The vanadium analogue of the latter [V N(l-Ad)(C6H3Me2-3,5) 3] 4 has also been characterized. Furthermore, a more efficient route to [Cr N(SiMe3)2 3] and a new crystal structure determination has been described. Three-coordinate metal amides have been treated in a general review that covers three-coordinate transition metal species with hard ligands. The electronic structure and bonding in tricoordinate amido complexes of transition metals have also been detailed 

The synthesis of Fe N(SiMe3)2 2 completed the divalent M(ll) series M = Mn—Ni. It was shown to have a two-coordinate monomeric structure in the vapor phase by gas electron diffraction. Its crystal structure showed that it was a symmetrically bridged dimer like its manganese and cobalt counterparts. Variable temperature H NMR spectroscopy indicated an association energy of only 3 kcal mol. The divalent series was also expanded to Cr(II) with use of the — NPr and —NCy2 (Cy = cyclohexyl) groups to afford the bridged 

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