Axial Ligation of Diazacyclooctanenickel and ‐Zinc Complexes

Thanks to the unusual folding of the diazacyclooctane ligand, which normally blocks an axial position of the metal center, the paramagnetic, blue nickel complex 1 containing a hexacoordinate central Ni atom could be synthesized. In the crystal the O atom of the carboxyl group not coordinated to the Ni center participates in hydrogen bonding with water molecules to form a three-dimensional network.