title: Diborane(4)-metal bonding: between hydrogen bridges and frustrated oxidative addition.
abstract: The metal complexes [M{HB(hpp)}(2)(CO)(4)] (M = Cr, Mo or W) and [M(cod){HB(hpp)}(2)Cl] (M = Rh or Ir) of the doubly-base stabilized diborane(4) ligand [HB(hpp)](2) were fully characterized and their bonding nature was investigated in detail. While bonding in the group 6 complexes predominantly occurs through the hydrogen atoms, the metal-ligand interaction in the group 9 complexes can be regarded as an early stage oxidative addition of the boron-boron bond leading to diboryl compounds.
authors.affiliation: Anorganisch-Chemisches Institut, Ruprecht-Karls-Universität Heidelberg, Im Neuenheimer Feld 270, 69120 Heidelberg, Germany.
authors.forename: Arne
authors.initials: A
authors.lastname: Wagner
authors.forename: Elisabeth
authors.initials: E
authors.lastname: Kaifer
authors.forename: Hans-Jörg
authors.initials: HJ
authors.lastname: Himmel