Pentacarbonyl(di-2-pyridylamine)-tungsten(0)

In the title molecular complex, (I), the W atom is in an octahedral environ ment with four equatorial carbonyl ligands and a fifth in an axial position trans to the monodentate dipyridylamine ligand. The long dimension of this last bisects the angle between two of the equatorial carbonyl groups and w hile the non-bonded pyridyl N atom is directed away from the W atom, the br idging amine group is directed towards it. Thus, in addition to the N atom to which it is attached, the amino H has two nearest neighbour C atoms of e quatorial carbonyl groups but does not participate in hydrogen bonding in a ny real or usual sense. The W-C bond distance for the axial carbonyl group is notably less than those of the equatorial groups.