The macrobicyclic ligand L2 forms dimetallic Ni-II cryptate species in
a delimited pH range, which are further able to include one N-3-anion
. The molecular structure of the azide-bridged complex shows an almost
linear (NiNNNNiII)-N-II arrangement and a different coordination at t
he two metal sites (one Ni-II being octahedral, the other trigonal bip
yramidal).