The reaction of dihydrogen with a side-on bound dinitrogen complex of
zirconium was investigated, Instead of a displacement of the dinitroge
n moiety, which is the common mode of reactivity, a complex containing
both a bridging hydride and a bridging hydrazido unit with a nitrogen
-hydrogen bond was observed. This reaction was extended to primary sil
anes to produce a species that contained a nitrogen-silicon bond. In a
ddition, an intermediate in the dihydrogen addition has been structura
lly characterized as having a bridging dihydrogen unit.