Neutron Diffraction Study of [Nd(AlMe4 )3 ]⋅0.5 Al2 Me6 at 100 K: The First Detailed Look at a Bridging Methyl Group with a Trigonal-Bipyramidal Carbon Atom.

Weak agostic Nd⋅⋅⋅H interactions and Nd-C bonds are involved in the bonding of the bridging methyl groups in the title compound (see sketch on the right): Two of the three H atoms of the methyl group are directed at the Nd center. The C atoms have distorted trigonal-bipyramidal geometry with the Nd atom and one of the H atoms (HA ) as axial ligands, and the Al atom and the other two H atoms (HB and HC ) in equatorial positions. The Al2 Me6 "solvate" molecule is disordered. © 1998 WILEY-VCH Verlag GmbH, Weinheim, Fed. Rep. of Germany.