(Silyl)(germyl)- and bis(germy1)nitrilimines 2 and 5 are obtained by adding [bis(trimethylsilyl)-methyl](pentamethylcyclopentadienyl)germylene (1) to (triisopropylsilyl)(trimethylstannyl)diazomethane and bis(trimethylstannyl)diazomethane, respectively; the reaction mechanism is discussed.